Thermo King Alarms Codes

We’ve compiled a list of common TK alarm codes (error codes) you may encounter:

TK Alarm Codes Manual as PDF

#ColorDescriptionOperator ActionProduct Type
00okNo Alarms ExistNo action required.Truck, trailer, CR, DAS, DSR
02checkCheck Evaporator Coil Sensor (Zone)Manually monitor temperature. Report alarm at end of day.Truck, trailer, CR, DAS, DSR
03checkCheck (Control) Return Air Sensor (Zone)Manually monitor temperature. Report alarm at end of day.Truck, trailer, CR, DAS, DSR
04checkCheck (Control) Discharge Air Sensor (Zone)Manually monitor temperature. Report alarm at end of day.Truck, trailer, CR, DAS, DSR
05okCheck Ambient Temp SensorReport alarm at end of day.Truck, trailer, CR, DAS, DSR
06okCheck Coolant Temp SensorReport alarm at end of day.Truck, trailer, CR, DAS, DSR
07okCheck Engine RPM SensorReport alarm at end of day.Truck, trailer, CR, DAS, DSR
08checkUnit Running on Coil Sensor (Zone)Manually monitor temperature. Report alarm at end of day.Truck, trailer, CR, DAS, DSR
09checkHigh Evaporator Temperature (Zone)If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
10take actionHigh Discharge Pressure (or Temperature)If unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
11checkUnit or Zone Controlling on Alternate Sensor (Zone)Manually monitor temperature. Report alarm at end of day.Truck, trailer, CR, DAS, DSR
12take actionSensor or Digital Input Shutdown (Zone)Unit/zone cannot operate and is shut down. Repair immediately.Truck, trailer, CR, DAS, DSR
13checkSensor Check (Zone)Manually monitor temperature. Report alarm at end of day.Truck, trailer, CR, DAS, DSR
14okDefrost Terminated by TimeReport alarm at end of day.Truck, trailer, CR, DAS, DSR
15checkCheck Glow Plugs or Intake Air HeaterIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
16okManual Start Not CompletedReport alarm at end of day.Truck, trailer, CR, DAS, DSR
17checkEngine Failed to CrankIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
18checkHigh Engine Coolant TemperatureIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
19checkLow Engine Oil PressureIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
20checkEngine (Vapor Motor CR) Failed to StartIf unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
21checkCooling Cycle Check (Zone)Manually monitor temperature. Report alarm at end of day.Truck, trailer, CR, DAS, DSR
22checkHeating Cycle Check (Zone)Manually monitor temperature. Report alarm at end of day.Truck, trailer, CR, DAS, DSR
23take actionCooling Cycle Fault (Zone)Unit/zone cannot operate and is shut down. Repair immediately.Truck, trailer, CR, DAS, DSR
24take actionHeating Cycle Fault (Zone)Unit/zone cannot operate and is shut down. Repair immediately.Truck, trailer, CR, DAS, DSR
25checkAlternator CheckIf unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
26checkCheck Refrigeration Capacity (Zone)Manually monitor temperature. Report alarm at end of day.Truck, trailer, CR, DAS, DSR
27take actionVapor Motor RPM High (CR)Unit cannot operate and is shut down. Repair immediately.Truck, trailer, CR, DAS, DSR
28okPretrip or Self Check AbortReport alarm at end of day.Truck, trailer, CR, DAS, DSR
29checkDefrost Damper Circuit Check (Zone)Manually monitor temperature. Report alarm at end of day.Truck, trailer, CR, DAS, DSR
30take actionDefrost Damper Stuck Closed (Zone)Unit/zone cannot operate and is shut down. Repair immediately.Truck, trailer, CR, DAS, DSR
31checkCheck Oil Pressure SwitchIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
32take actionRefrigeration Capacity Low (Zone)Unit/zone cannot operate and is shut down. Repair immediately.Truck, trailer, CR, DAS, DSR
33okCheck Engine RPMReport alarm at end of day.Truck, trailer, CR, DAS, DSR
34checkCheck Modulation CircuitManually monitor temperature. Report alarm at end of day.Truck, trailer, CR, DAS, DSR
35take actionCheck Run Relay CircuitUnit cannot operate and is shut down. Repair immediately.Truck, trailer, CR, DAS, DSR
36take actionElectric Motor Failed to RunUnit cannot operate and is shut down. Repair immediately. Switch to Diesel ModeTruck, trailer, CR, DAS, DSR
37okCheck Engine Coolant LevelReport alarm at end of day.Truck, trailer, CR, DAS, DSR
38take actionElectric Phase ReversedIf unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
39checkCheck Water Valve CircuitManually monitor temperature. Report alarm at end of day.Truck, trailer, CR, DAS, DSR
40checkCheck High Speed CircuitIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
41checkCheck Engine Coolant TempReport alarm at end of day.Truck, trailer, CR, DAS, DSR
42checkUnit Forced to Low SpeedReport alarm at end of day.Truck, trailer, CR, DAS, DSR
43okUnit Forced to Low Speed ModulationReport alarm at end of day.Truck, trailer, CR, DAS, DSR
44take actionCheck Fuel SystemAdd fuel as necessary. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
45checkCheck Hot Gas or Hot Gas Bypass CircuitIf unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
46checkCheck Air Flow (Zone)Manually monitor temperature. Report alarm at end of day.Truck, trailer, CR, DAS, DSR
47take actionRemote Sensor ShutdownUnit/zone cannot operate and is shut down. Repair immediately.Truck, trailer, CR, DAS, DSR
48take actionCheck Belts or ClutchIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
49okCheck Spare Sensor 1Report alarm at end of day.Truck, trailer, CR, DAS, DSR
50okReset ClockReport alarm at end of day.Truck, trailer, CR, DAS, DSR
51take actionCheck Shutdown CircuitIf unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
52checkCheck Heat Circuit (Zone)If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
53checkCheck Economizer Valve CircuitIf unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
54okTest Mode TimeoutClear alarm and restart unit.Truck, trailer, CR, DAS, DSR
55okCheck Engine SpeedsReport alarm at end of day.Truck, trailer, CR, DAS, DSR
56checkCheck Evaporator Fan Low Speed (Zone)If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
57checkCheck Evaporator Fan High Speed (Zone)If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
61checkLow Battery VoltageIf unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
62take actionAmmeter Out of CalibrationUnit cannot operate and is shut down. Repair immediately.Truck, trailer, CR, DAS, DSR
63take actionEngine or Vapor Motor StoppedIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
64okPretrip ReminderReport alarm at end of day.Truck, trailer, CR, DAS, DSR
65checkAbnormal Temperature Differential (Zone)If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
66take actionLow Engine Oil LevelIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
67checkCheck Liquid Line Solenoid Circuit (Zone)If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
68take actionInternal Controller Fault CodeIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
70okHourmeter FailureReport alarm at end of day.Truck, trailer, CR, DAS, DSR
71okHourmeter 4 Exceeds Set Time LimitReport alarm at end of day.Truck, trailer, CR, DAS, DSR
72okHourmeter 5 Exceeds Set Time LimitReport alarm at end of day.Truck, trailer, CR, DAS, DSR
73okHourmeter 6 Exceeds Set Time LimitReport alarm at end of day.Truck, trailer, CR, DAS, DSR
74okController Reset to DefaultsReport alarm at end of day.Truck, trailer, CR, DAS, DSR
75take actionController RAM FailureIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
76take actionController EPROM FailureIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
77take actionController EPROM Checksum FailureIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
78take actionData Log EPROM FailureIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
79okInternal Data Logger OverflowReport alarm at end of day.Truck, trailer, CR, DAS, DSR
80okCheck Compressor Temp SensorReport alarm at end of day.Truck, trailer, CR, DAS, DSR
81take actionHigh Compressor TempIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
82take actionHigh Compressor Temp ShutdownUnit cannot operate and is shut down. Repair immediately.Truck, trailer, CR, DAS, DSR
83okLow Engine Coolant TempReport alarm at end of day.Truck, trailer, CR, DAS, DSR
84okRestart NullReport alarm at end of day.Truck, trailer, CR, DAS, DSR
85okForced Unit OperationReport alarm at end of day.Truck, trailer, CR, DAS, DSR
86okCheck Discharge Pressure SensorReport alarm at end of day.Truck, trailer, CR, DAS, DSR
87okCheck Suction Pressure SensorReport alarm at end of day.Truck, trailer, CR, DAS, DSR
88okReserved for CRTruck, trailer, CR, DAS, DSR
89okCheck Electronic Throttling Valve (ETV) CircuitIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
90okElectric OverloadIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
91okCheck Electric Ready InputIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
92okSensor Grades Not Set (Zone)Report alarm at end of day.Truck, trailer, CR, DAS, DSR
93okLow Compressor Suction PressureIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
94okCheck Loader #1 CircuitIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
95okCheck Loader #2 CircuitIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
96checkLow Fuel LevelAdd fuel as required.Truck, trailer, CR, DAS, DSR
97take actionFailed Remote Return Air Sensor (CR)If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
98okCheck Fuel Level SensorReport alarm at end of day.Truck, trailer, CR, DAS, DSR
99take actionHigh Compressor Pressure RatioIf unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
100checkHeater Fan Failure (CR)If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
101take actionControlling on Evap Coil Outlet Temp (CR)Manually monitor temperature. Report alarm at end of day.Truck, trailer, CR, DAS, DSR
102checkLow Evaporator Coil Temperature (CR)If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
103checkLow Heater Fuel Level (CR)Manually monitor temperature. Report alarm at end of day.Truck, trailer, CR, DAS, DSR
104checkCheck Remote Fan Speed (Zone)Manually monitor temperature. Report alarm at end of day.Truck, trailer, CR, DAS, DSR
105checkCheck Receiver Tank Press Sol CircuitIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
106checkCheck Purge Valve CircuitIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
107checkCheck Condenser Inlet Sol CircuitIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
108checkDoor Open Timeout (Zone)Close doors. Report alarm at end of day.Truck, trailer, CR, DAS, DSR
109naCheck High Discharge Pressure SensorReplaced by Alarm Code 86Truck, trailer, CR, DAS, DSR
110checkCheck Suction Line Sol Circuit (Zone)If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
111okUnit Not Configured Correctly (Zone)Report alarm at end of day.Truck, trailer, CR, DAS, DSR
112checkCheck Remote Fans (Zone)If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
113checkCheck Electric Heat Circuit (Zone)Manually monitor temperature. Report alarm at end of day.Truck, trailer, CR, DAS, DSR
114take actionMultiple Alarms - Can Not Run (Zone)Unit/zone cannot operate and is shut down. Repair immediately.Truck, trailer, CR, DAS, DSR
115checkCheck High Pressure Cut Out SwitchIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
116okCheck High Pressure Cut In SwitchReport alarm at end of day.Truck, trailer, CR, DAS, DSR
117okAuto Switch from Diesel to ElectricNormal operation – does not affect performance.Truck, trailer, CR, DAS, DSR
118okAuto Switch from Electric to DieselNormal operation – does not affect performance.Truck, trailer, CR, DAS, DSR
119naReserved for CRTruck, trailer, CR, DAS, DSR
120checkCheck Alternator Excite CircuitIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
121checkCheck PMW Liquid Injection CircuitIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
122checkCheck Diesel/Electric CircuitIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
123checkCheck Evap Coil Inlet Temp Sensor (CR)Manually monitor temperature. Report alarm at end of day.Truck, trailer, CR, DAS, DSR
124okCheck Evap Coil Outlet Temp Sensor (CR)Report alarm at end of day.Truck, trailer, CR, DAS, DSR
125checkCheck Tank Level Sensor (CR)If unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
126checkCheck Back Pressure Regulator (CR)Manually monitor load temperature. Report this alarm at the end of the day.Truck, trailer, CR, DAS, DSR
127checkSetpoint Not Entered (Zone)Be sure setpoint is adjusted to required temperature.Truck, trailer, CR, DAS, DSR
128okEngine Run Time Maint Reminder #1/Service DueReport alarm at end of day.Truck, trailer, CR, DAS, DSR
129okEngine Run Time Maint Reminder #2Report alarm at end of day.Truck, trailer, CR, DAS, DSR
130okElectric Run Time Maint Reminder #1Report alarm at end of day.Truck, trailer, CR, DAS, DSR
131okElectric Run Time Maint Reminder #2Report alarm at end of day.Truck, trailer, CR, DAS, DSR
132okTotal Unit Run Time Maint Reminder #1Report alarm at end of day.Truck, trailer, CR, DAS, DSR
133okTotal Unit Run Time Maint Reminder #2Report alarm at end of day.Truck, trailer, CR, DAS, DSR
134okController Power On HoursReport alarm at end of day.Truck, trailer, CR, DAS, DSR
135okCheck Spare Digital InputsReport alarm at end of day.Truck, trailer, CR, DAS, DSR
136okCheck Spare Digital OutputsReport alarm at end of day.Truck, trailer, CR, DAS, DSR
137checkCheck Damper Motor Heater OutputIf unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
138okLog DAS Real Time Clock Battery Failure (DAS)Report alarm at end of day.Truck, trailer, CR, DAS, DSR
139okAbort Evacuation ModeReport alarm at end of day.Truck, trailer, CR, DAS, DSR
140naNot currently usedTruck, trailer, CR, DAS, DSR
141checkAuto Switch Diesel to Electric DisabledReport alarm at end of day.Truck, trailer, CR, DAS, DSR
142checkCheck Thermax ValveIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
143okCheck Remote Drain Hose Heater Output (Zone)Report alarm at end of day.Truck, trailer, CR, DAS, DSR
144take actionLost CAN Communications to Expansion ModuleUnit cannot operate and is shut down. Repair immediately.Truck, trailer, CR, DAS, DSR
145checkLost Controller ON Feedback SignalIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
146okSoftware Version MismatchReport alarm at end of day.Truck, trailer, CR, DAS, DSR
147checkCheck Multi-Temp Fan Speed Control Output (Zone)Manually monitor load temperature. Report this alarm at the end of the day.Truck, trailer, CR, DAS, DSR
148checkAuto Switch Electric to Diesel DisabledReport alarm at end of day.Truck, trailer, CR, DAS, DSR
149checkAlarm Not IdentifiedIf unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
150okSensor Out of Range Low (DAS and HMI) (Zone)Report alarm at end of day.Truck, trailer, CR, DAS, DSR
151okSensor Out of Range High (DAS and HMI) (Zone)Report alarm at end of day.Truck, trailer, CR, DAS, DSR
152okDAS Failed Sensor (DAS)Report alarm at end of day.Truck, trailer, CR, DAS, DSR
153okExpansion Module Flash Load FailureReport alarm at end of day.Truck, trailer, CR, DAS, DSR
154checkLow Suction Pressure Switch FailureIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
155take actionLost CAN Communications to HMIUnit cannot operate and is shut down. Repair immediately.Truck, trailer, CR, DAS, DSR
156checkCheck Suction/Liquid Heat Exchanger Bypass ValveIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
157okOptiSet Plus Profile MismatchReport alarm at end of day.Truck, trailer, CR, DAS, DSR
158okPrimary Software Failed to LoadReport alarm at end of day.Truck, trailer, CR, DAS, DSR
159okCheck Battery ConditionReport alarm at end of day.Truck, trailer, CR, DAS, DSR
160okLost CAN Communications to Radio Expansion BoardReport alarm at end of day.Truck, trailer, CR, DAS, DSR
161okLog DAS Real Time Clock Invalid (DAS)Report alarm at end of day.Truck, trailer, CR, DAS, DSR
163checkEmission Control FailureIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
175checkCheck Electronic Expansion Valve (CR)If unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
176checkCheck Evaporator Pressure Sensor (CR)If unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
177checkCheck CO 2 Tank Pressure Sensor (CR)If unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
178checkLow CO 2 Fuel Level (CR)If unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
180checkTriPac Compressor AlarmIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Truck, trailer, CR, DAS, DSR
188checkLog DAS Microprocessor Fault (DAS)Report alarm at end of day.Truck, trailer, CR, DAS, DSR
203checkCheck Display Return Air Sensor (Zone)Manually monitor temperature. Report alarm at end of day.Truck, trailer, CR, DAS, DSR
204checkCheck Display Discharge Air Sensor (Zone)Manually monitor temperature. Report alarm at end of day.Truck, trailer, CR, DAS, DSR
216okCheck DAS Digital Inputs (DAS)Report alarm at end of day.Truck, trailer, CR, DAS, DSR
233okREB Switching Off, Conservative to Full NullReport alarm at end of day.Truck, trailer, CR, DAS, DSR
234okCheck Relative Humidity Sensor CircuitReport alarm at end of day.Truck, trailer, CR, DAS, DSR
235okHigh Engine Coolant Temperature CheckReport alarm at end of day.Truck, trailer, CR, DAS, DSR
250okDAS Clock Time Reset (DAS)Report alarm at end of day.Truck, trailer, CR, DAS, DSR
251okCheck Radio Expansion Board ConfigurationReport alarm at end of day.Truck, trailer, CR, DAS, DSR
252okCheck Auto Fresh Air Exchange CircuitReport alarm at end of day.Truck, trailer, CR, DAS, DSR
253okREB On Back Up Battery, Alarms DisabledReport alarm at end of day.Truck, trailer, CR, DAS, DSR
254okCheck Auxiliary Coolant Temp SensorReport alarm at end of day.Truck, trailer, CR, DAS, DSR
500checkCheck Host Evaporator Blower Low SpeedNot implementedPrecedent 500 Series
501checkCheck Host Evaporator Blower High SpeedNot implementedPrecedent 500 Series
505checkCheck Roadside Condenser Fan Motor Speed CircuitIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 500 Series
506checkCheck Curbside Condenser Fan Motor Speed CircuitIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 500 Series
507okCheck Digital Scroll Output Circuit (Scroll Only)If unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 500 Series
508okSpeed Request Communication ErrorReport alarm at end of day.Precedent 500 Series
509checkECU Failed to EnableIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 500 Series
510checkECU Run Signal FailedIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 500 Series
511okEngine Wait to Start Time Delay ExpiredReport alarm at end of day.Precedent 500 Series
512checkHigh Compressor Suction Pressure (Scroll Only)If unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 500 Series
513checkLow Compressor Suction Ratio (Scroll Only)If unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 500 Series
514checkLow Compressor Discharge Pressure (Scroll Only)If unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 500 Series
515checkMinimum ETV Discharge Superheat Temp (Scroll)If unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 500 Series
516take actionI/O Controller to Application Controller Com FailureThe unit is no longer able to operate and has been shut down. Repair immediately.Precedent 500 Series
518checkGenerator Ground FaultIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 500 Series
519checkCheck Battery Charger Input PowerIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 500 Series
520checkCheck Battery Charger Output PowerIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 500 Series
521checkBattery Charger External/Environmental FaultIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 500 Series
522checkBattery Temperature Sensor AlarmIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 500 Series
523checkBattery Charger Indicated ConditionsIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 500 Series
524checkGenerator Op Limit V out to Frequency RationIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 500 Series
525checkGenerator Frequency Range FaultIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 500 Series
526checkGenerator Operational Limit Output CurrentIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 500 Series
528checkFailed J1939 CAN Comm Base Controller/ChargerIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 500 Series
529checkCheck Fuel Pump CircuitIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 500 Series
530checkLow Pressure Differential (Scroll only)If unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 500 Series
531checkCheck Economizer Pressure Sensor (Scroll only)If unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 500 Series
538checkEngine J1939 CAN Data Link DegradedIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 500 Series
539checkEngine J1939 CAN Data Link FailedIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 500 Series
540checkIllegal Engine Operating StateIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 500 Series
542okBattery Charger Fault – Unit Forced to Low SpeedMaintenance information only. Report alarm at end of day.Precedent 500 Series
543okBattery Charger Internal ShortMaintenance information only. Report alarm at end of day.Precedent 500 Series
544okBattery Charger External ShortMaintenance information only. Report alarm at end of day.Precedent 500 Series
545okBattery Charger Output Voltage Exceeded LimitMaintenance information only. Report alarm at end of day.Precedent 500 Series
546okBattery Charger Operating Bulk Voltage Out of RangeMaintenance information only. Report alarm at end of day.Precedent 500 Series
547checkAC Bus Phase LossIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 500 Series
548okBattery Charger Temperature Below Operating RangeMaintenance information only. Report alarm at end of day.Precedent 500 Series
549okBattery Charger AC Input OvervoltageMaintenance information only. Report alarm at end of day.Precedent 500 Series
550checkBattery Charger Internal Overvoltage FaultIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 500 Series
551okBattery Charger Internal Temp Sensor FaultPrecedent 500 Series
552okBattery Charger Charging – Low BatteryPrecedent 500 Series
553okBattery Charger Operating Derated Due to High tempPrecedent 500 Series
599okEngine Service Tool ConnectedReport alarm at end of day.Precedent 500 Series
600okCheck Crankshaft Speed SensorReport alarm at end of day.Precedent 600 Series, DTC
601okCheck Camshaft Speed SensorReport alarm at end of day.Precedent 600 Series, DTC
603okCheck Exhaust Pressure SensorReport alarm at end of day.Precedent 600 Series, DTC
604okCheck Coolant Temp SensorReport alarm at end of day.Precedent 600 Series, DTC
605okCheck Fresh Air Temp SensorReport alarm at end of day.Precedent 600 Series, DTC
607okCheck Fuel Temperature SensorReport alarm at end of day.Precedent 600 Series, DTC
608okCheck Rail Pressure SensorReport alarm at end of day.Precedent 600 Series, DTC
609okCheck Intake Pressure SensorReport alarm at end of day.Precedent 600 Series, DTC
610okCheck Atmospheric Pressure SensorReport alarm at end of day.Precedent 600 Series, DTC
611okCheck Glow Plug CircuitReport alarm at end of day.Precedent 600 Series, DTC
613okCheck InjectorsReport alarm at end of day.Precedent 600 Series, DTC
614okCheck High Pressure Fuel PumpReport alarm at end of day.Precedent 600 Series, DTC
615checkRail Pressure FaultIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 600 Series, DTC
616checkEngine OverspeedIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 600 Series, DTC
617checkInternal ECU FaultIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 600 Series, DTC
618okCheck EGR SystemReport alarm at end of day.Precedent 600 Series, DTC
619okECU Main Relay FaultReport alarm at end of day.Precedent 600 Series, DTC
620checkNo RPM Detected During Start AttemptIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 600 Series, DTC
623okTRUCAN Message TimeoutReport alarm at end of day.Precedent 600 Series, DTC
624okCheck EGR Temperature SensorReport alarm at end of day.Precedent 600 Series, DTC
625okCheck Intake Air Temperature SensorReport alarm at end of day.Precedent 600 Series, DTC
626okCheck Exhaust Temperature SensorReport alarm at end of day.Precedent 600 Series, DTC
642okECU Forced Low SpeedReport alarm at end of day.Precedent 600 Series, DTC
699checkUnknown ECU FaultIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 600 Series, DTC
800okCrankshaft Position Sensor ErrorReport alarm at end of day.Precedent 800 Series, DTC
801okCamshaft Position Sensor ErrorReport alarm at end of day.Precedent 800 Series, DTC
804okEngine Coolant Temperature Sensor ErrorReport alarm at end of day.Precedent 800 Series, DTC
807okFuel Temperature Sensor ErrorReport alarm at end of day.Precedent 800 Series, DTC
808okRail Pressure Sensor ErrorReport alarm at end of day.Precedent 800 Series, DTC
809okIntake Air Pressure Sensor ErrorReport alarm at end of day.Precedent 800 Series, DTC
810okAtmospheric Pressure Sensor ErrorReport alarm at end of day.Precedent 800 Series, DTC
811okGlow Plug Circuit ErrorReport alarm at end of day.Precedent 800 Series, DTC
813okGeneral Injector ErrorReport alarm at end of day.Precedent 800 Series, DTC
815checkFuel Pressure Regulator ErrorIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 800 Series, DTC
818okEGR Valve Actuator ErrorReport alarm at end of day.Precedent 800 Series, DTC
819okECU Power Relay ErrorReport alarm at end of day.Precedent 800 Series, DTC
820okMain ECU Relay ErrorReport alarm at end of day.Precedent 800 Series, DTC
825okT1 Air Intake Temperature Sensor ErrorReport alarm at end of day.Precedent 800 Series, DTC
826okT2 Air Intake Temperature Sensor ErrorReport alarm at end of day.Precedent 800 Series, DTC
827okEGR Valve Position Sensor ErrorReport alarm at end of day.Precedent 800 Series, DTC
828okLambda System ErrorReport alarm at end of day.Precedent 800 Series, DTC
829okEngine Communication ErrorReport alarm at end of day.Precedent 800 Series, DTC
830okAir Flow Meter ErrorReport alarm at end of day.Precedent 800 Series, DTC
832okEngine Power Supply ErrorReport alarm at end of day.Precedent 800 Series, DTC
833okHigh Pressure Pump Fuel Metering Unit ErrorReport alarm at end of day.Precedent 800 Series, DTC
834okWater in Fuel Sensor ErrorReport alarm at end of day.Precedent 800 Series, DTC
836okMajor ECU FailuresReport alarm at end of day.Precedent 800 Series, DTC
838okIntake Air System ErrorReport alarm at end of day.Precedent 800 Series, DTC
839okEngine Speed ErrorReport alarm at end of day.Precedent 800 Series, DTC
840okFuel Injection Energizing ErrorReport alarm at end of day.Precedent 800 Series, DTC
841okHigh Pressure Pump WearReport alarm at end of day.Precedent 800 Series, DTC
842okEngine Running in Safe Mode – Low SpeedReport alarm at end of day.Precedent 800 Series, DTC
843okFuel Injection System ErrorReport alarm at end of day.Precedent 800 Series, DTC
844okEngine Failed to CrankReport alarm at end of day.Precedent 800 Series, DTC
845okStarter Relay ErrorReport alarm at end of day.Precedent 800 Series, DTC
846okT50 Switch ErrorReport alarm at end of day.Precedent 800 Series, DTC
847okVariant Coding ErrorReport alarm at end of day.Precedent 800 Series, DTC
853checkEngine Overspeed (No DTC)If unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 800 Series, DTC
854checkEngine Protection Self ShutdownIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 800 Series, DTC
899checkUnknown ECU FaultIf unit is shut down repair immediately. Otherwise, report alarm at end of day.Precedent 800 Series, DTC
P1EcheckReturn Air Temperature Sensor FaultReport alarm at end of day.DSR
P2EcheckRemote Return Air Temperature Sensor FaultReport alarm at end of day.DSR
OLtake actionElectric Standby OverloadIf unit is shut down repair immediately. Otherwise, report alarm at end of day.DSR
bAttake actionLow Battery VoltageIf unit is shut down repair immediately. Otherwise, report alarm at end of day.DSR
HPtake actionHigh Discharge PressureIf unit is shut down repair immediately. Otherwise, report alarm at end of day.DSR
LPtake actionLow Suction PressureIf unit is shut down repair immediately. Otherwise, report alarm at end of day.DSR
PSEtake actionHigh Pressure Sensor FaultIf unit is shut down repair immediately. Otherwise, report alarm at end of day.DSR
tEPtake actionElectric Standby Motor Thermal Protection AlarmIf unit is shut down repair immediately. Otherwise, report alarm at end of day.DSR
tP4take actionPower Supply Thermal Protection AlarmIf unit is shut down repair immediately. Otherwise, report alarm at end of day.DSR
dr1checkDoor 1 Open/Door Switch 1 FailureClose door. Report alarm at end of day.DSR
dr2checkDoor 2 Open/Door Switch 2 FailureClose door. Report alarm at end of day.DSR
tCOtake actionElectronic Control Module Internal Temperature Exceeds LimitIf unit is shut down repair immediately. Otherwise, report alarm at end of day.DSR
SOFtake actionMicroprocessor Software FailureIf unit is shut down repair immediately. Otherwise, report alarm at end of day.DSR
- C -take actionCommunications Failure, Microprocessor to In-Cab
Control Box
If unit is shut down repair immediately. Otherwise, report alarm at end of day.DSR

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Greater Grand Rapids

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Phone: (616) 878-4900

Metro Detroit

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Phone: (313) 532-3006