Diagnostics
CAT Fault Codes: Meanings, Causes & Fixes
In-depth, plain-English guides to CAT fault codes and error codes. Each guide covers what the code means, what triggers it, the most common causes, and the first things to check before you call the dealer.
- 00Brake Pedal Switch #2 Fault
- 01Idle Shutdown Override
- 12Coolant Level voltage low
- 13Fuel Temperature voltage high
- 14Med/High Retarder current high
- 16Engine Injector Cylinder #01 : Current Above Normal
- 215 Volt Supply voltage low
- 2211Engine Timing Sensor : Other Failure Mode
- 23112Cruise Control Pause Switch : Abnormal Update Rate
- 24Oil Pressure voltage low
- 25Engine Injector Cylinder #02 : Current Below Normal
- 26Engine Injector Cylinder #02 : Current Above Normal
- 27Coolant Temperature voltage high
- 28Throttle Sensor out of calibration
- 29PTO Throttle out of calibration
- 31Vehicle Speed loss of signal
- 32Engine Injector Cylinder #03 : Erratic, Intermittent, or Incorrect
- 33Turbo Wastegate Solenoid current low
- 34Primary Engine Speed loss of signal
- 35Engine Injector Cylinder #03 : Current Below Normal
- 36Engine Injector Cylinder #03 : Current Above Normal
- 38Intake Manifold Air Temperature voltage low
- 42Primary to Secondary Engine Speed Signal Calibration
- 46Engine Injector Cylinder #04 : Current Above Normal
- 47Engine Injector Cylinder #04 : Not Responding Properly
- 49Inlet Air Heater current low
- 51Low ECM Battery Power
- 55Engine Injector Cylinder #05 : Current Below Normal
- 56Engine Injector Cylinder #05 : Current Above Normal
- 58J1922 Data Link Fault
- 61Very High Coolant Temperature
- 62Engine Injector Cylinder #06 : Erratic, Intermittent, or Incorrect
- 64Very High Intake Manifold Air Temperature
- 65Engine Injector Cylinder #06 : Current Below Normal
- 66Engine Injector Cylinder #06 : Current Above Normal
- 67Engine Injector Cylinder #06 : Not Responding Properly
- 72Cylinder #1 Injector current fault
- 73Cylinder #4 Injector current fault
- 74Cylinder #5 Injector current fault
- 91Intake Valve Actuation Oil Pressure not responding
- 92Intake Valve Actuator #1 not responding
- 93Intake Valve Actuator #3 not responding
- 94Intake Valve Actuator #5 not responding
Safety-critical: confirm before use
Torque, lifting, and load-chart values are safety-critical. Never operate from these figures alone. Confirm against the official manual and a qualified technician.