Diagnostic Trouble Code List
Use the instrument cluster or use the Caterpillar Electronic Technician (Cat ET) to determine the diagnostic trouble codes for the Transmission ECU. After determining the diagnostic trouble codes, refer to the corresponding test procedure for more information. Perform the procedure that corresponds with the correct diagnostic trouble code. The following table is a list of possible diagnostic trouble codes for the Transmission ECU.
Portions of this material are reprinted with permission from SAE J1939DA_201607© 2016 SAE International. SAE International is not responsible for any use or translation of this material, in whole or in part. Please contact SAE International to obtain a complete copy of SAE J1939DA_201607, the official definitive source of this standard.
Show/hide table
| Diagnostic Trouble Codes For The Transmission ECU | |
|---|---|
| For troubleshooting, see the procedure with the same "SPN" and "FMI". | |
| "SPN"/FMI | Description |
| SPN 117 Parking Brake Pressure Switch | |
| FMI 2 | Data that is erratic, intermittent, or incorrect |
| SPN 127 Transmission Oil Pressure Sensor | |
| FMI 3 | Voltage above normal |
| FMI 4 | Voltage below normal |
| SPN 161 Transmission Input Speed Sensor | |
| FMI 2 | Data that is erratic, intermittent, or incorrect |
| SPN 177 Transmission Oil Temperature Sensor | |
| FMI 3 | Voltage above normal |
| FMI 4 | Voltage below normal |
| SPN 191 Transmission Output Speed Sensor #1 | |
| FMI 12 | Speed failure |
| SPN 525 Shift Lever Position Sensor | |
| FMI 0 | Voltage above normal |
| FMI 1 | Current below normal or open circuit |
| FMI 8 | Current above normal or closed circuit |
| SPN 625 Cat Data Link | |
| FMI 9 | Abnormal update |
| SPN 639 J1939 Data Link | |
| FMI 9 | Abnormal update |
| SPN 701 Transmission Clutch Solenoid #9 | |
| FMI 3 | Voltage above normal |
| FMI 5 | Current below normal or open circuit |
| FMI 6 | Current above normal or closed circuit |
| SPN 702 Inching Pedal Switch | |
| FMI 2 | Data that is erratic, intermittent, or incorrect |
| FMI 7 | Not responding |
| SPN 703 Inching Pedal Position Sensor | |
| FMI 0 | Voltage above normal |
| FMI 1 | Current below normal or open circuit |
| FMI 8 | Current above normal or closed circuit |
| SPN 704 Auxiliary I/O #4 | |
| FMI 12 | Bad device or component |
| SPN 705 Headland Autoshift Switch - Set Gear Switch | |
| FMI 2 | Data that is erratic, intermittent, or incorrect |
| SPN 706 Four Wheel Drive (4WD) Switch | |
| FMI 2 | Data that is erratic, intermittent, or incorrect |
| SPN 734 Transmission Clutch Solenoid #1 | |
| FMI 3 | Voltage above normal |
| FMI 5 | Current below normal or open circuit |
| FMI 6 | Current above normal or closed circuit |
| SPN 735 Transmission Clutch Solenoid #2 | |
| FMI 3 | Voltage above normal |
| FMI 5 | Current below normal or open circuit |
| FMI 6 | Current above normal or closed circuit |
| SPN 736 Transmission Clutch Solenoid #3 | |
| FMI 3 | Voltage above normal |
| FMI 5 | Current below normal or open circuit |
| FMI 6 | Current above normal or closed circuit |
| SPN 737 Transmission Clutch Solenoid #4 | |
| FMI 3 | Voltage above normal |
| FMI 5 | Current below normal or open circuit |
| FMI 6 | Current above normal or closed circuit |
| SPN 738 Transmission Clutch Solenoid #5 | |
| FMI 3 | Voltage above normal |
| FMI 5 | Current below normal or open circuit |
| FMI 6 | Current above normal or closed circuit |
| SPN 739 Transmission Clutch Solenoid #6 | |
| FMI 3 | Voltage above normal |
| FMI 5 | Current below normal or open circuit |
| FMI 6 | Current above normal or closed circuit |
| SPN 774 Upshift Switch | |
| FMI 2 | Data that is erratic, intermittent, or incorrect |
| SPN 775 Downshift Switch | |
| FMI 2 | Data that is erratic, intermittent, or incorrect |
| SPN 1079 5 Volt Sensor Supply Voltage | |
| FMI 0 | Voltage is high - most severe |
| FMI 1 | Voltage is low - most severe |
| FMI 3 | Voltage above normal |
| FMI 4 | Voltage below normal |
| SPN 1084 Four Wheel Drive Transmission Output Speed Sensor | |
| FMI 12 | Voltage above normal |
| SPN 1542 10 Volt Sensor Supply Voltage | |
| FMI 0 | Voltage is high - most severe |
| FMI 1 | Voltage is low - most severe |
| SPN 1619 Backup Alarm Relay | |
| FMI 3 | Voltage above normal |
| FMI 5 | Current below normal or open circuit |
| FMI 6 | Current above normal or closed circuit |
| SPN 1666 Auto/Manual Shift Switch | |
| FMI 2 | Data that is erratic, intermittent, or incorrect |
| SPN 1675 Starter Relay | |
| FMI 3 | Voltage above normal |
| FMI 5 | Current below normal or open circuit |
| FMI 6 | Current above normal or closed circuit |
| SPN 2612 Four Wheel Drive Actuator Solenoid | |
| FMI 3 | Voltage above normal |
| FMI 5 | Current below normal or open circuit |
| FMI 6 | Current above normal or closed circuit |
| SPN 2905 Transmission Clutch Solenoid #7 | |
| FMI 3 | Voltage above normal |
| FMI 5 | Current below normal or open circuit |
| FMI 6 | Current above normal or closed circuit |
| SPN 2906 Transmission Clutch Solenoid #8 | |
| FMI 3 | Voltage above normal |
| FMI 5 | Current below normal or open circuit |
| FMI 6 | Current above normal or closed circuit |
Caterpillar Information System:
C9 Agricultural Engine for Challenger Tractors Power Is Intermittently Low or Power Cutout Is Intermittent
Starting Motor - Delco 50-MT Normal Operation
C3.4 IND Industrial Engine Maintenance Interval Schedule
C9 Agricultural Engine for Challenger Tractors Engine Top Speed Is Not Obtained
C3.4 IND Industrial Engine Reference Material
C4.4 and C6.6 Engines for Caterpillar Built Machines Fuel Rail Pump Solenoid - Test
C3.4 IND Industrial Engine Engine Valve Lash - Inspect/Adjust
C4.4 (Mech) Industrial Engine Crankcase Breather (Canister) - Replace
3176C, 3406E and 3456 Industrial Engines Engine Stalls at Low RPM
Starting Motor - Delco 50-MT Starting Motor - Assemble
Starting Motor - Delco 50-MT Starting Motor - Disassemble
Starting Motor - Delco 50-MT General Information
C32 Marine Engines Fuel Filter Base - Remove and Install
Tightening Procedure for the Studs of the Variable Valve Actuator for 735 and 740 Articulated Trucks and C15 On-highway Truck Engine{1130} Tightening Procedure for the Studs of the Variable Valve Actuator for 735 and 740 Articulated Trucks and C15 On-highway Truck Engine{1130}
C9.3 Engines for Caterpillar Built Machines Cylinder Head - Remove
C9 Agricultural Engine for Challenger Tractors Component Location
CX28 On-Highway Transmission Oil Filter and Base (Power Train) - Remove and Install
Starting Motor - Delco 50-MT Starting Motor
C9 Agricultural Engine for Challenger Tractors Air Inlet Heater - Test
C32 Marine Propulsion Engines Injector Solenoid - Test
C32 Marine and Auxiliary Marine Engines Exhaust Manifold - Remove and Install
3512B Marine Auxiliary Engine Engine Oil and Filter - Change
Contaminated Oil Related Component Failures in Light Armored Vehicles That Are Powered by 3126 Engines{1308} Contaminated Oil Related Component Failures in Light Armored Vehicles That Are Powered by 3126 Engines{1308}
C9.3 Engines for Caterpillar Built Machines Cylinder Head - Install