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A technician working on a Thermo King unit

Thermo King alarm codes

Alarm codes

Look up the code on your unit's display to see what it means and what the operator should do. The actions are suggestions only: always consult your company for final decisions. Not every code is possible on every unit.

Call TKSEStatus lights

Thermo King of the Southeast (TKSE) lists alarm codes by unit type. The code shows on the unit's controller display. Write down every alarm to help the technician. A code shown in parentheses may appear with code 84 and clear on its own.

Need it fixed? See reefer repair, or call for a mobile service truck.

Codes last checked

All codes, by unit type.

Truck, trailer, CR and DAS

  • 00OK to runNo Alarms ExistNo action required.
  • 02Check as specifiedCheck Evaporator Coil Sensor (Zone)Manually monitor temperature. Report alarm at end of day.Call TKSE about code 02
  • 03Check as specifiedCheck (Control); Return Air Sensor (Zone)Manually monitor temperature. Report alarm at end of day.Call TKSE about code 03
  • 04Check as specifiedCheck (Control); Discharge Air Sensor (Zone)Manually monitor temperature. Report alarm at end of day.Call TKSE about code 04
  • 05OK to runCheck Ambient Temp SensorReport alarm at end of day.
  • 06OK to runCheck Coolant Temp SensorReport alarm at end of day.
  • 07OK to runCheck Engine RPM SensorReport alarm at end of day.
  • 08Check as specifiedUnit Running on Coil Sensor (Zone)Manually monitor temperature. Report alarm at end of day.Call TKSE about code 08
  • (09)Check as specifiedHigh Evaporator Temperature (Zone)If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code (09)
  • (10)Take immediate actionHigh Discharge Pressure (or Temperature)If unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code (10)
  • 11Check as specifiedUnit or Zone Controlling on Alternate Sensor (Zone)Manually monitor temperature. Report alarm at end of day.Call TKSE about code 11
  • 12Take immediate actionSensor or Digital Input Shutdown (Zone)Unit/zone cannot operate and is shut down. Repair immediately.Call TKSE about code 12
  • 13Check as specifiedSensor Check (Zone)Manually monitor temperature. Report alarm at end of day.Call TKSE about code 13
  • 14OK to runDefrost Terminated by TimeReport alarm at end of day.
  • 15Check as specifiedCheck Glow Plugs or Intake Air HeaterIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 15
  • 16OK to runManual Start Not CompletedReport alarm at end of day.
  • (17)Check as specifiedEngine Failed to CrankIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code (17)
  • (18)Check as specifiedHigh Engine Coolant TemperatureIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code (18)
  • (19)Check as specifiedLow Engine Oil PressureIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code (19)
  • (20)Check as specifiedEngine (Vapor Motor CR) Failed to StartIf unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code (20)
  • (21)Check as specifiedCooling Cycle Check (Zone)Manually monitor temperature. Report alarm at end of day.Call TKSE about code (21)
  • (22)Check as specifiedHeating Cycle Check (Zone)Manually monitor temperature. Report alarm at end of day.Call TKSE about code (22)
  • 23Take immediate actionCooling Cycle Fault (Zone)Unit/zone cannot operate and is shut down. Repair immediately.Call TKSE about code 23
  • 24Take immediate actionHeating Cycle Fault (Zone)Unit/zone cannot operate and is shut down. Repair immediately.Call TKSE about code 24
  • 25Check as specifiedAlternator CheckIf unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 25
  • (26)Check as specifiedCheck Refrigeration Capacity (Zone)Manually monitor temperature. Report alarm at end of day.Call TKSE about code (26)
  • (27)Take immediate actionVapor Motor RPM High (CR)Unit cannot operate and is shut down. Repair immediately.Call TKSE about code (27)
  • 28OK to runPretrip or Self Check AbortReport alarm at end of day.
  • 29Check as specifiedDefrost Damper Circuit Check (Zone)Manually monitor temperature. Report alarm at end of day.Call TKSE about code 29
  • 30Take immediate actionDefrost Damper Stuck Closed (Zone)Unit/zone cannot operate and is shut down. Repair immediately.Call TKSE about code 30
  • 31Check as specifiedCheck Oil Pressure SwitchIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 31
  • 32Take immediate actionRefrigeration Capacity Low (Zone)Unit/zone cannot operate and is shut down. Repair immediately.Call TKSE about code 32
  • 33OK to runCheck Engine RPMReport alarm at end of day.
  • 34Check as specifiedCheck Modulation CircuitManually monitor temperature. Report alarm at end of day.Call TKSE about code 34
  • 35Take immediate actionCheck Run Relay CircuitUnit cannot operate and is shut down. Repair immediately.Call TKSE about code 35
  • (36)Take immediate actionElectric Motor Failed to RunUnit cannot operate and is shut down. Repair immediately. Switch to Diesel Mode.Call TKSE about code (36)
  • 37OK to runCheck Engine Coolant LevelReport alarm at end of day.
  • 38Take immediate actionElectric Phase ReversedIf unit/zone is shut down repair immediately.Call TKSE about code 38
  • 39Check as specifiedCheck Water Valve CircuitManually monitor temperature. Report alarm at end of day.Call TKSE about code 39
  • 40Check as specifiedCheck High Speed CircuitIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 40
  • 41Check as specifiedCheck Engine Coolant TempReport alarm at end of day.Call TKSE about code 41
  • 42Check as specifiedUnit Forced to Low SpeedReport alarm at end of day.Call TKSE about code 42
  • 43OK to runUnit Forced to Low Speed ModulationReport alarm at end of day.
  • 44Take immediate actionCheck Fuel SystemAdd fuel as necessary. Otherwise, report alarm at end of day.Call TKSE about code 44
  • 45Check as specifiedCheck Hot Gas or Hot Gas Bypass CircuitIf unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 45
  • 46Check as specifiedCheck Air Flow (Zone)Manually monitor temperature. Report alarm at end of day.Call TKSE about code 46
  • 47Take immediate actionRemote Sensor ShutdownUnit/zone cannot operate and is shut down. Repair immediately.Call TKSE about code 47
  • 48Take immediate actionCheck Belts or ClutchIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 48
  • 49OK to runCheck Spare Sensor 1Report alarm at end of day.
  • 50OK to runReset ClockReport alarm at end of day.
  • 51Take immediate actionCheck Shutdown CircuitIf unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 51
  • 52Check as specifiedCheck Heat Circuit (Zone)If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 52
  • 53Check as specifiedCheck Economizer Valve CircuitIf unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 53
  • 54OK to runTest Mode TimeoutClear alarm and restart unit.
  • 55OK to runCheck Engine SpeedsReport alarm at end of day.
  • 56Check as specifiedCheck Evaporator Fan Low Speed (Zone)If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 56
  • 57Check as specifiedCheck Evaporator Fan High Speed (Zone)If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 57
  • 61Check as specifiedLow Battery VoltageIf unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 61
  • 62Take immediate actionAmmeter Out of CalibrationUnit cannot operate and is shut down. Repair immediately.Call TKSE about code 62
  • (63)Take immediate actionEngine or Vapor Motor StoppedIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code (63)
  • 64OK to runPretrip ReminderReport alarm at end of day.
  • 65Check as specifiedAbnormal Temperature Differential (Zone)If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 65
  • 66Take immediate actionLow Engine Oil LevelIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 66
  • 67Check as specifiedCheck Liquid Line Solenoid Circuit (Zone)If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 67
  • 68Take immediate actionInternal Controller Fault CodeIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 68
  • 70OK to runHourmeter FailureReport alarm at end of day.
  • 71OK to runHourmeter 4 Exceeds Set Time LimitReport alarm at end of day.
  • 72OK to runHourmeter 5 Exceeds Set Time LimitReport alarm at end of day.
  • 73OK to runHourmeter 6 Exceeds Set Time LimitReport alarm at end of day.
  • 74OK to runController Reset to DefaultsReport alarm at end of day.
  • 75Take immediate actionController RAM FailureIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 75
  • 76Take immediate actionController EPROM FailureIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 76
  • 77Take immediate actionController EPROM Checksum FailureIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 77
  • 78Take immediate actionData Log EPROM FailureIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 78
  • 79OK to runInternal Data Logger OverflowReport alarm at end of day.
  • 80OK to runCheck Compressor Temp SensorReport alarm at end of day.
  • 81Take immediate actionHigh Compressor TempIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 81
  • 82Take immediate actionHigh Compressor Temp ShutdownUnit cannot operate and is shut down. Repair immediately.Call TKSE about code 82
  • 83OK to runLow Engine Coolant TempReport alarm at end of day.
  • 84OK to runRestart NullReport alarm at end of day.
  • 85OK to runForced Unit OperationReport alarm at end of day.
  • 86OK to runCheck Discharge Pressure SensorReport alarm at end of day.
  • 87OK to runCheck Suction Pressure SensorReport alarm at end of day.
  • 88OK to runReserved for CRNo operator action for this code.
  • 89OK to runCheck Electronic Throttling Valve (ETV) CircuitIf unit is shut down repair immediately. Otherwise, report alarm at end of day.
  • 90OK to runElectric OverloadIf unit is shut down repair immediately. Otherwise, report alarm at end of day.
  • 91OK to runCheck Electric Ready InputIf unit is shut down repair immediately. Otherwise, report alarm at end of day.
  • 92OK to runSensor Grades Not Set (Zone)Report alarm at end of day.
  • 93OK to runLow Compressor Suction PressureIf unit is shut down repair immediately. Otherwise, report alarm at end of day.
  • 94OK to runCheck Loader #1 CircuitIf unit is shut down repair immediately. Otherwise, report alarm at end of day.
  • 95OK to runCheck Loader #2 CircuitIf unit is shut down repair immediately. Otherwise, report alarm at end of day.
  • 96Check as specifiedLow Fuel LevelAdd fuel as required.Call TKSE about code 96
  • 97Take immediate actionFailed Remote Return Air Sensor (CR)If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 97
  • 98OK to runCheck Fuel Level SensorReport alarm at end of day.
  • 99Take immediate actionHigh Compressor Pressure RatioIf unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 99
  • (100)Check as specifiedHeater Fan Failure (CR)If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code (100)
  • 101Take immediate actionControlling on Evap Coil Outlet Temp (CR)Manually monitor temperature. Report alarm at end of day.Call TKSE about code 101
  • (102)Check as specifiedLow Evaporator Coil Temperature (CR)If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code (102)
  • 103Check as specifiedLow Heater Fuel Level (CR)Manually monitor temperature. Report alarm at end of day.Call TKSE about code 103
  • 104Check as specifiedCheck Remote Fan Speed (Zone)Manually monitor temperature. Report alarm at end of day.Call TKSE about code 104
  • 105Check as specifiedCheck Receiver Tank Press Sol CircuitIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 105
  • 106Check as specifiedCheck Purge Valve CircuitIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 106
  • 107Check as specifiedCheck Condenser Inlet Sol CircuitIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 107
  • 108Check as specifiedDoor Open Timeout (Zone)Close doors. Report alarm at end of day.Call TKSE about code 108
  • 110Check as specifiedCheck Suction Line Sol Circuit (Zone)If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 110
  • 111OK to runUnit Not Configured Correctly (Zone)Report alarm at end of day.
  • 112Check as specifiedCheck Remote Fans (Zone)If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 112
  • 113Check as specifiedCheck Electric Heat Circuit (Zone)Manually monitor temperature. Report alarm at end of day.Call TKSE about code 113
  • 114Take immediate actionMultiple Alarms - Can Not Run (Zone)Unit/zone cannot operate and is shut down. Repair immediately.Call TKSE about code 114
  • 115Check as specifiedCheck High Pressure Cut Out SwitchIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 115
  • 116OK to runCheck High Pressure Cut In SwitchReport alarm at end of day.
  • 117OK to runAuto Switch from Diesel to ElectricNormal operation – does not affect performance.
  • 118OK to runAuto Switch from Electric to DieselNormal operation – does not affect performance.
  • 120Check as specifiedCheck Alternator Excite CircuitIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 120
  • 121Check as specifiedCheck PMW Liquid Injection CircuitIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 121
  • 122Check as specifiedCheck Diesel/Electric CircuitIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 122
  • 123Check as specifiedCheck Evap Coil Inlet Temp Sensor (CR)Manually monitor temperature. Report alarm at end of day.Call TKSE about code 123
  • 124OK to runCheck Evap Coil Outlet Temp Sensor (CR)Report alarm at end of day.
  • 125Check as specifiedCheck Tank Level Sensor (CR)If unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 125
  • 126Check as specifiedCheck Back Pressure Regulator (CR)Manually monitor temperature. Report alarm at end of day.Call TKSE about code 126
  • 127Check as specifiedSetpoint Not Entered (Zone)Be sure setpoint is adjusted to required temperature.Call TKSE about code 127
  • 128OK to runEngine Run Time Maint Reminder #1/Service DueReport alarm at end of day.
  • 129OK to runEngine Run Time Maint Reminder #2Report alarm at end of day.
  • 130OK to runElectric Run Time Maint Reminder #1Report alarm at end of day.
  • 131OK to runElectric Run Time Maint Reminder #2Report alarm at end of day.
  • 132OK to runTotal Unit Run Time Maint Reminder #1Report alarm at end of day.
  • 133OK to runTotal Unit Run Time Maint Reminder #2Report alarm at end of day.
  • 134OK to runController Power On HoursReport alarm at end of day.
  • 135OK to runCheck Spare Digital InputsReport alarm at end of day.
  • 136OK to runCheck Spare Digital OutputsReport alarm at end of day.
  • 137Check as specifiedCheck Damper Motor Heater OutputIf unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 137
  • 138OK to runLog DAS Real Time Clock Battery Failure (DAS)Report alarm at end of day.
  • 139OK to runAbort Evacuation ModeReport alarm at end of day.
  • 141Check as specifiedAuto Switch Diesel to Electric DisabledReport alarm at end of day.Call TKSE about code 141
  • 142Check as specifiedCheck Thermax ValveIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 142
  • 143OK to runCheck Remote Drain Hose Heater Output (Zone)Report alarm at end of day.
  • 144Take immediate actionLost CAN Communications to Expansion ModuleUnit cannot operate and is shut down. Repair immediately.Call TKSE about code 144
  • 145Check as specifiedLost Controller ON Feedback SignalIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 145
  • 146OK to runSoftware Version MismatchReport alarm at end of day.
  • 147Check as specifiedCheck Multi-Temp Fan Speed Control Output (Zone)Manually monitor temperature. Report alarm at end of day.Call TKSE about code 147
  • 148Check as specifiedAuto Switch Electric to Diesel DisabledReport alarm at end of day.Call TKSE about code 148
  • 149Check as specifiedAlarm Not IdentifiedIf unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 149
  • 150OK to runSensor Out of Range Low (DAS and HMI) (Zone)Report alarm at end of day.
  • 151OK to runSensor Out of Range High (DAS and HMI) (Zone)Report alarm at end of day.
  • 152OK to runDAS Failed Sensor (DAS)Report alarm at end of day.
  • 153OK to runExpansion Module Flash Load FailureReport alarm at end of day.
  • 154Check as specifiedLow Suction Pressure Switch FailureIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 154
  • 155Take immediate actionLost CAN Communications to HMIUnit cannot operate and is shut down. Repair immediately.Call TKSE about code 155
  • 156Check as specifiedCheck Suction/Liquid Heat Exchanger Bypass ValveIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 156
  • 157OK to runOptiSet Plus Profile MismatchReport alarm at end of day.
  • 158OK to runPrimary Software Failed to LoadReport alarm at end of day.
  • 159OK to runCheck Battery ConditionReport alarm at end of day.
  • 160OK to runLost CAN Communications to Radio Expansion BoardReport alarm at end of day.
  • 161OK to runLog DAS Real Time Clock Invalid (DAS)Report alarm at end of day.
  • 163Check as specifiedEmission Control FailureIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 163
  • 165Check as specifiedLow Engine Power AvailableReport alarm at end of day.Call TKSE about code 165
  • 175Check as specifiedCheck Electronic Expansion Valve (CR)If unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 175
  • 176Check as specifiedCheck Evaporator Pressure Sensor (CR)If unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 176
  • 177Check as specifiedCheck CO2 Tank Pressure Sensor (CR)If unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 177
  • 178Check as specifiedLow CO2 Fuel Level (CR)If unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 178
  • 180Check as specifiedTriPac Compressor AlarmIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 180
  • 188Check as specifiedLog DAS Microprocessor Fault (DAS)Report alarm at end of day.Call TKSE about code 188
  • 203Check as specifiedCheck Display Return Air Sensor (Zone)Manually monitor temperature. Report alarm at end of day.Call TKSE about code 203
  • 204Check as specifiedCheck Display Discharge Air Sensor (Zone)Manually monitor temperature. Report alarm at end of day.Call TKSE about code 204
  • 216OK to runCheck DAS Digital Inputs (DAS)Report alarm at end of day.
  • 233OK to runREB Switching Off, Conservative to Full NullReport alarm at end of day.
  • 234OK to runCheck Relative Humidity Sensor CircuitReport alarm at end of day.
  • 235OK to runHigh Engine Coolant Temperature CheckReport alarm at end of day.
  • 250OK to runDAS Clock Time Reset (DAS)Report alarm at end of day.
  • 251OK to runCheck Radio Expansion Board ConfigurationReport alarm at end of day.
  • 252OK to runCheck Auto Fresh Air Exchange CircuitReport alarm at end of day.
  • 253OK to runREB On Back Up Battery, Alarms DisabledReport alarm at end of day.
  • 254OK to runCheck Auxiliary Coolant Temp SensorReport alarm at end of day.

Precedent 500 series

  • 500Check as specifiedCheck Host Evaporator Blower Low SpeedNot implementedCall TKSE about code 500
  • 501Check as specifiedCheck Host Evaporator Blower High SpeedNot implementedCall TKSE about code 501
  • 505Check as specifiedCheck Roadside Condenser Fan Motor Speed CircuitIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 505
  • 506Check as specifiedCheck Curbside Condenser Fan Motor Speed CircuitIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 506
  • 507OK to runCheck Digital Scroll Output Circuit (Scroll Only)If unit is shut down repair immediately. Otherwise, report alarm at end of day.
  • 508OK to runSpeed Request Communication ErrorReport alarm at end of day.
  • 509Check as specifiedECU Failed to EnableIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 509
  • 510Check as specifiedECU Run Signal FailedIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 510
  • 511OK to runEngine Wait to Start Time Delay ExpiredReport alarm at end of day.
  • 512Check as specifiedHigh Compressor Suction Pressure (Scroll Only)If unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 512
  • 513Check as specifiedLow Compressor Suction Ratio (Scroll Only)If unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 513
  • 514Check as specifiedLow Compressor Discharge Pressure (Scroll Only)If unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 514
  • 515Check as specifiedMinimum ETV Discharge Superheat Temp (Scroll)If unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 515
  • 516Take immediate actionI/O Controller to Application Controller Com FailureThe unit is no longer able to operate and has been shut down. Repair immediately.Call TKSE about code 516
  • 518Check as specifiedGenerator Ground FaultIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 518
  • 519Check as specifiedCheck Battery Charger Input PowerIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 519
  • 520Check as specifiedCheck Battery Charger Output PowerIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 520
  • 521Check as specifiedBattery Charger External/Environmental FaultIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 521
  • 522Check as specifiedBattery Temperature Sensor AlarmIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 522
  • 523Check as specifiedBattery Charger Indicated ConditionsIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 523
  • 524Check as specifiedGenerator Op Limit Vout to Frequency RationIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 524
  • 525Check as specifiedGenerator Frequency Range FaultIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 525
  • 526Check as specifiedGenerator Operational Limit Output CurrentIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 526
  • 528Check as specifiedFailed J1939 CAN Comm Base Controller/ChargerIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 528
  • 529Check as specifiedCheck Fuel Pump CircuitIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 529
  • 530Check as specifiedLow Pressure Differential (Scroll only)If unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 530
  • 531Check as specifiedCheck Economizer Pressure Sensor (Scroll only)If unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 531
  • 538Check as specifiedEngine J1939 CAN Data Link DegradedIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 538
  • 539Check as specifiedEngine J1939 CAN Data Link FailedIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 539
  • 540Check as specifiedIllegal Engine Operating StateIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 540
  • 542OK to runBattery Charger Fault – Unit Forced to Low SpeedMaintenance information only. Report alarm at end of day.
  • 543OK to runBattery Charger Internal ShortMaintenance information only. Report alarm at end of day.
  • 544OK to runBattery Charger External ShortMaintenance information only. Report alarm at end of day.
  • 545OK to runBattery Charger Output Voltage Exceeded LimitMaintenance information only. Report alarm at end of day.
  • 546OK to runBattery Charger Operating Bulk Voltage Out of RangeMaintenance information only. Report alarm at end of day.
  • 547Check as specifiedAC Bus Phase LossIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 547
  • 548OK to runBattery Charger Temperature Below Operating RangeMaintenance information only. Report alarm at end of day.
  • 549OK to runBattery Charger AC Input OvervoltageMaintenance information only. Report alarm at end of day.
  • 550Check as specifiedBattery Charger Internal Overvoltage FaultIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 550
  • 551OK to runBattery Charger Internal Temp Sensor FaultNo operator action for this code.
  • 552OK to runBattery Charger Charging – Low BatteryNo operator action for this code.
  • 553OK to runBattery Charger Operating Derated Due to High tempNo operator action for this code.
  • 570Check as specifiedClean EGR SoonReport alarm at end of day.Call TKSE about code 570
  • 599OK to runEngine Service Tool ConnectedReport alarm at end of day.

Precedent 600 series (Yanmar engine)

  • 600OK to runCheck Crankshaft Speed SensorReport alarm at end of day.
  • 601OK to runCheck Camshaft Speed SensorReport alarm at end of day.
  • 602OK to runCheck Intake Throttle Position SensorReport alarm at end of day.
  • 603OK to runCheck Exhaust Pressure SensorReport alarm at end of day.
  • 604OK to runCheck Coolant Temp SensorReport alarm at end of day.
  • 605OK to runCheck Fresh Air Temp SensorReport alarm at end of day.
  • 607OK to runCheck Fuel Temperature SensorReport alarm at end of day.
  • 608OK to runCheck Rail Pressure SensorReport alarm at end of day.
  • 609OK to runCheck Intake Pressure SensorReport alarm at end of day.
  • 610OK to runCheck Atmospheric Pressure SensorReport alarm at end of day.
  • 611OK to runCheck Glow Plug CircuitReport alarm at end of day.
  • 612OK to runCheck Intake Throttle CircuitReport alarm at end of day.
  • 613OK to runCheck InjectorsReport alarm at end of day.
  • 614OK to runCheck High Pressure Fuel PumpReport alarm at end of day.
  • 615Check as specifiedRail Pressure FaultIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 615
  • 616Check as specifiedEngine OverspeedIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 616
  • 617Check as specifiedInternal ECU FaultIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 617
  • 618OK to runCheck EGR SystemReport alarm at end of day.
  • 619OK to runECU Main Relay FaultReport alarm at end of day.
  • 620Check as specifiedNo RPM Detected During Start AttemptIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 620
  • 623OK to runTRUCAN Message TimeoutReport alarm at end of day.
  • 624OK to runCheck EGR Temperature SensorReport alarm at end of day.
  • 625OK to runCheck Intake Air Temperature SensorReport alarm at end of day.
  • 626OK to runCheck Exhaust Temperature SensorReport alarm at end of day.
  • 642OK to runECU Forced Low SpeedReport alarm at end of day.
  • 699Check as specifiedUnknown ECU FaultIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 699

Precedent 800 series (Peugeot engine)

  • 800OK to runCrankshaft Position Sensor ErrorReport alarm at end of day.
  • 801OK to runCamshaft Position Sensor ErrorReport alarm at end of day.
  • 804OK to runEngine Coolant Temperature Sensor ErrorReport alarm at end of day.
  • 807OK to runFuel Temperature Sensor ErrorReport alarm at end of day.
  • 808OK to runRail Pressure Sensor ErrorReport alarm at end of day.
  • 809OK to runIntake Air Pressure Sensor ErrorReport alarm at end of day.
  • 810OK to runAtmospheric Pressure Sensor ErrorReport alarm at end of day.
  • 811OK to runGlow Plug Circuit ErrorReport alarm at end of day.
  • 813OK to runGeneral Injector ErrorReport alarm at end of day.
  • 815Check as specifiedFuel Pressure Regulator ErrorIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 815
  • 818OK to runEGR Valve Actuator ErrorReport alarm at end of day.
  • 819OK to runECU Power Relay ErrorReport alarm at end of day.
  • 820OK to runMain ECU Relay ErrorReport alarm at end of day.
  • 825OK to runT1 Air Intake Temperature Sensor ErrorReport alarm at end of day.
  • 826OK to runT2 Air Intake Temperature Sensor ErrorReport alarm at end of day.
  • 827OK to runEGR Valve Position Sensor ErrorReport alarm at end of day.
  • 828OK to runLambda System ErrorReport alarm at end of day.
  • 829OK to runEngine Communication ErrorReport alarm at end of day.
  • 830OK to runAir Flow Meter ErrorReport alarm at end of day.
  • 832OK to runEngine Power Supply ErrorReport alarm at end of day.
  • 833OK to runHigh Pressure Pump Fuel Metering Unit ErrorReport alarm at end of day.
  • 834OK to runWater in Fuel Sensor ErrorReport alarm at end of day.
  • 836OK to runMajor ECU FailuresReport alarm at end of day.
  • 838OK to runIntake Air System ErrorReport alarm at end of day.
  • 839OK to runEngine Speed ErrorReport alarm at end of day.
  • 840OK to runFuel Injection Energizing ErrorReport alarm at end of day.
  • 841OK to runHigh Pressure Pump WearReport alarm at end of day.
  • 842OK to runEngine Running in Safe Mode – Low SpeedReport alarm at end of day.
  • 843OK to runFuel Injection System ErrorReport alarm at end of day.
  • 844OK to runEngine Failed to CrankReport alarm at end of day.
  • 845OK to runStarter Relay ErrorReport alarm at end of day.
  • 846OK to runT50 Switch ErrorReport alarm at end of day.
  • 847OK to runVariant Coding ErrorReport alarm at end of day.
  • 853Check as specifiedEngine Overspeed (No DTC)If unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 853
  • 854Check as specifiedEngine Protection Self ShutdownIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 854
  • 899Check as specifiedUnknown ECU FaultIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code 899

Direct Smart Reefer (DSR)

  • SOFTake immediate actionMicroprocessor Software FailureIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code SOF
  • tEPTake immediate actionElectric Standby Motor Thermal Protection AlarmIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code tEP
  • - C -Take immediate actionCommunications Failure, Microprocessor to In-Cab Control BoxIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code - C -
  • dr2Check as specifiedDoor 2 Open/Door Switch 2 FailureClose door. Report alarm at end of day.Call TKSE about code dr2
  • LPTake immediate actionLow Suction PressureIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code LP
  • P1ECheck as specifiedReturn Air Temperature Sensor FaultReport alarm at end of day.Call TKSE about code P1E
  • HPTake immediate actionHigh Discharge PressureIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code HP
  • dr1Check as specifiedDoor 1 Open/Door Switch 1 FailureClose door. Report alarm at end of day.Call TKSE about code dr1
  • OLTake immediate actionElectric Standby OverloadIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code OL
  • P2ECheck as specifiedRemote Return Air Temperature Sensor FaultReport alarm at end of day.Call TKSE about code P2E
  • bAtTake immediate actionLow Battery VoltageIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code bAt
  • tP4Take immediate actionPower Supply Thermal Protection AlarmIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code tP4
  • PSETake immediate actionHigh Pressure Sensor FaultIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code PSE
  • tCOTake immediate actionElectronic Control Module Internal Temperature Exceeds LimitIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Call TKSE about code tCO
A Thermo King SR-4 controller and its display on a trailer unit

Read it from the display.

Read it to your shop with the unit's model and serial number.

Call TKSE

Can't find it? Call TKSE.

Read the shop the code on the display, and have the unit's model and serial number ready.

Call TKSERequest service
Call TKSERequest service