Use the "DIAGNOSTIC" Lamp or a Caterpillar electronic service tool to determine the diagnostic flash code.
Use the following procedure to retrieve the diagnostic codes if the engine is equipped with a "DIAGNOSTIC" lamp:
- Turn the cruise control ON/OFF switch to the OFF position.
- Move the SET/RESUME switch to either position. Hold that position until the "YELLOW" lamp begins to flash.
The "YELLOW" lamp will flash in order to indicate a two-digit flash code and the SET/RESUME switch may be released. The sequence of flashes represents the system diagnostic message. Count the first sequence of flashes in order to determine the first digit of the diagnostic code. After a two second pause, the second sequence of flashes will identify the second digit of the diagnostic code.
Any additional diagnostic codes will follow a pause. The additional diagnostic codes will be displayed in the same manner. Flash Code 55 signals that No Detected Faults have occurred since the ignition keyswitch has been turned to the ON position.
Refer to the Service Manual or consult an authorized Caterpillar dealer for the following items.
- Further information
- Assistance for repairs
- Troubleshooting
The electronic diagnostic codes are listed and described in Table 1.
Note: Table 1 contains a list of flash codes with brief descriptions and related PID/SID-FMI codes.
Some codes record events or some codes indicate that a mechanical system needs attention rather than indicating a performance problem. Troubleshooting is not required for codes "35", "41", "47" and "55". Code "01" will not flash. Some codes will limit the operation or the performance of the engine.
Note: Refer to the troubleshooting manual for recommended service procedures.
| Diagnostic Flash Code Reference | ||
|---|---|---|
| Flash Code | Diagnostic Code Description | PID/SID – FMI |
| 00 | Engine Protection System has Shutdown Engine | 71-07 |
| 00 | Inlet Air Shutoff Shutdown | 52-11 |
| 00 | Quickstop Occurrence | 84-14 |
| 00 | Rated Engine Power Special Instructions | 166-14 |
| 00 | Outside Air Temp Sensor Voltage High | 171-03 |
| 00 | Outside Air Temp Sensor Voltage Low | 171-04 |
| 00 | No Outside Air Temp Data | 171-11 |
| 00 | Theft Deterrent Enabled | 224-11 |
| 00 | Engine Cranking with Theft Deterrent Enabled | 224-14 |
| 00 | J1939 Device Sending Incorrect Data | 231-02 |
| 00 | J1939 Device Not Responding | 231-12 |
| 00 | J1939 Loss of Message | 231-14 |
| 00 | Brake Pedal Switch #1 Fault | 246-11 |
| 00 | Brake Pedal Switch #2 Fault | 247-11 |
| 01 | Idle Shutdown Override | 71-00 |
| 12 | Invalid Coolant Level | 111-02 |
| 12 | Coolant Level Sensor Voltage High | 111-03 |
| 12 | Coolant Level Sensor Voltage Low | 111-04 |
| 13 | Fuel Temp Voltage High | 174-03 |
| 13 | Fuel Temp Voltage Low | 174-04 |
| 14 | Retarder Solenoid Low/High Voltage Low | 121-05 |
| 14 | Retarder Solenoid Low/High Voltage High | 121-06 |
| 14 | Retarder Solenoid Med/High Voltage Low | 122-05 |
| 14 | Retarder Solenoid Med/High Voltage High | 122-06 |
| 21 | 8 Volt Supply Above Normal | 41-03 |
| 21 | 8 Volt Supply Below Normal | 41-04 |
| 21 | 5 Volt Supply Above Normal | 232-03 |
| 21 | 5 Volt Supply Below Normal | 232-04 |
| 24 | Oil Pressure Sensor Voltage High | 100-03 |
| 24 | Oil Pressure Sensor Voltage Low | 100-04 |
| 25 | Boost Pressure Sensor Voltage High | 102-03 |
| 25 | Boost Pressure Sensor Voltage Low | 102-04 |
| 25 | Boost Pressure Not Responding | 102-07 |
| 26 | Barometric Pressure Voltage High | 108-03 |
| 26 | Barometric Pressure Voltage Low | 108-04 |
| 26 | Barometric Pressure Signal Rate of Change | 108-10 |
| 27 | Coolant Temperature Sensor Voltage High | 110-03 |
| 27 | Coolant Temperature Sensor Voltage Low | 110-04 |
| 28 | Accelerator Pedal Position Out of Calibration | 91-13 |
| 29 | PTO Throttle Signal Invalid | 30-08 |
| 29 | PTO Throttle Signal Calibration | 30-13 |
| 31 | Loss of Wheel-Based Vehicle Speed Signal | 84-01 |
| 32 | Accelerator Pedal Position Invalid | 91-08 |
| 34 | Loss of Secondary Engine Speed Signal | 64-02 |
| 34 | Primary Engine Speed Loss of Signal | 190-08 |
| 35 | Engine Overspeed Warning | 190-00 |
| 36 | Invalid Wheel-Based Vehicle Speed Signal | 84-02 |
| 36 | Wheel-Based Vehicle Speed Out of Range | 84-08 |
| 36 | Wheel-Based Vehicle Speed Rate of Change | 84-10 |
| 38 | Intake Manifold Air Temperature Sensor Voltage High | 105-03 |
| 38 | Intake Manifold Air Temperature Sensor Voltage Low | 105-04 |
| 41 | Wheel-Based Vehicle Overspeed Warning | 84-00 |
| 42 | Primary to Secondary Engine Speed Signal Calibration | 22-11 |
| 42 | Engine Speed Signal Calibration Not Performed | 22-13 |
| 46 | Low Oil Pressure Warning | 100-01 |
| 46 | Very Low Oil Pressure | 100-11 |
| 47 | Idle Shutdown Occurrence | 71-01 |
| 47 | PTO Shutdown Occurrence | 71-14 |
| 51 | Intermittent Battery Power to the ECM | 168-02 |
| 55 | No Faults Active or Logged | 0-00 |
| 56 | Check Customer or System Parameters | 253-02 |
| 56 | Check Transmission Customer Parameters | 253-11 |
| 59 | Engine Software Incorrect | 252-11 |
| 61 | High Coolant Temperature Warning | 110-00 |
| 61 | Very High Coolant Temperature | 110-11 |
| 62 | Low Coolant Level Warning | 111-01 |
| 62 | Very Low Coolant Level | 111-11 |
| 62 | Low Coolant Level Warning (Less than 6 engine hours) | 111-14 |
| 64 | High Intake Manifold Air Temperature Warning | 105-00 |
| 64 | Very High Intake Manifold Air Temperature | 105-11 |
| 65 | High Fuel Temp Warning | 174-00 |
| 66 | Auxiliary Output #06 Current Low | 54-05 |
| 66 | Auxiliary Output #06 Current High | 54-06 |
| 67 | Auxiliary Output #07 Current Low | 55-05 |
| 67 | Auxiliary Output #07 Current High | 55-06 |
| 68 | Transmission Not Responding | 191-07 |
| 71 | Ignition Key Switch Fault | 43-02 |
| 72 | Cylinder #1 Injector Current Low | 1-05 |
| 72 | Cylinder #1 Injector Current High | 1-06 |
| 72 | Cylinder #2 Injector Current Low | 2-05 |
| 72 | Cylinder #2 Injector Current High | 2-06 |
| 73 | Cylinder #3 Injector Current Low | 3-05 |
| 73 | Cylinder #3 Injector Current High | 3-06 |
| 73 | Cylinder #4 Injector Current Low | 4-05 |
| 73 | Cylinder #4 Injector Current High | 4-06 |
| 74 | Cylinder #5 Injector Current Low | 5-05 |
| 74 | Cylinder #5 Injector Current High | 5-06 |
| 74 | Cylinder #6 Injector Current Low | 6-05 |
| 74 | Cylinder #6 Injector Current High | 6-06 |
For further information or assistance for repair, consult an authorized Caterpillar dealer.