U0101-LOST COMMUNICATION WITH TCM
For a complete wiring diagram, refer to the Wiring Information.
- When Monitored:
-
Set Condition:
If the Anti-Lock Brake System (ABS) Module fails to receive bus messages from the Transmission Control Module TCM) for approximately 500 ms.
Possible Causes |
|---|
| DTCs RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES |
| CAN C BUS CIRCUITS OPEN OR SHORTED |
| TRANSMISSION CONTROL MODULE (TCM) POWER AND GROUND |
| POWERTRAIN CONTROL MODULE (PCM) DTCs PRESENT |
| TRANSMISSION CONTROL MODULE (TCM) |
| ANTI-LOCK BRAKES SYSTEM (ABS) MODULE |
| NOTE: | Verify the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. |
| NOTE: | If present, diagnose and repair DTC U0002-CAN C BUS OFF PERFORMANCE, DTC or DTC U1502-IMPLAUSIBLE MESSAGE DATA LENGTH RECEIVED FROM TIPM before diagnosing this DTC. |
| 1. | Turn the ignition on. |
| 2. | With the scan tool, read and record the ABS DTCs. |
| 3. | With the scan tool, read and record Environmental Data (EV Data). |
| 4. | With the scan tool, erase the ABS DTCs. |
| 5. | Cycle the ignition switch. |
| 6. | With the scan tool, read the ABS DTCs. |
Does this DTC reset?
Yes
- Go To 2
No
- Perform the Stored Lost Communication DTCs diagnostic procedure (Refer to 29 - Non-DTC Diagnostics/Communication - Diagnosis and Testing) .
2. CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCs
| 1. | With the scan tool, read all active DTCs from all CAN C Bus modules. |
| NOTE: | Check for CAN C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs. |
Does the scan tool display any active DTCs related to the conditions listed above?
Yes
No
- Go To 3
3. VERIFY THAT THE TCM IS ACTIVE ON THE BUS
| 1. | With the scan tool, select ECU View. |
| 2. | Verify that the TCM is active on the bus. |
Is the TCM active on the bus?
Yes
- Go To 4
No
- For a no response test procedure (Refer to 29 - Non-DTC Diagnostics/Communication - Diagnosis and Testing) .
4. CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCs
| 1. | With the scan tool, select Network View and select Advanced. |
Is there more than one module with active DTCs “Logged Against” the TCM?
Yes
- Replace/update the TCM in accordance with the service information.
- Perform the TCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure).
No
- Replace the Anti-Lock Brakes System (ABS) Module in accordance with the service information.
- Perform the ABS VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Standard Procedure).