Powertrain

U0101-LOST COMMUNICATION WITH TCM

WHEN MONITORED:
Ignition run time is greater than 1 second. Battery voltage between 9 and 16 volts. Engine run time greater than 3 seconds.

SET CONDITION:
The PCM doesn't receive a Bus Message from the Transmission Control Module for 7 consecutive seconds. The circuit is continuously monitored. One trip fault.

POSSIBLE CAUSES
- CAN C BUS open or shorted condition
- PCM

Refer to Body Control Systems for diagnostic procedures and for further possible causes.

Diagnostic Test

1. ACTIVE DTC

Ignition on, engine not running.
With a scan tool, read PCM DTCs.

Q: Is the DTC active at this time?

YES: Refer to Body Control Systems for diagnostic procedures and for further possible causes.
NO: Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Component Tests and General Diagnostics
Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test