Diagnostic trouble code (DTC) information
Condition
The transmission control module (TCM) and engine control module (ECM) communicate via a standardized serial interface. Both the control modules transmit and receive data. The engine control module (ECM) transmits "identification" data to the transmission control module (TCM). Diagnostic trouble code (DTC) TCM-0048 is stored if the transmission control module (TCM) registers that the engine control module (ECM) "identity" does not correspond to the programmed "identity".
Substitute Value
- The control module "Limp Home" program has been initiated.
Possible Source
Incorrect engine control module (ECM) or transmission control module (TCM) version.
Fault symptom[s]
- Warning lamp for the automatic transmission flashes
- Malfunction indicator lamp (MIL) lit
- No lock-up function
- Harsh gear shifting.