DTC 78 - P0600

Name of Code:
P-0600(78) - Serial Communication Link Malfunction

When Monitored: Continuously with key on.

Set Condition: If no bus messages are received by the Transmission Control Module (TCM) for 10 seconds.

Theory of Operation: The TCM communicates with the other modules in the vehicle using the bus. It relies on certain information to function properly. The TCM continuously monitors the bus to check for messages broadcast from the certain modules.

Transmission Effects: Possible improper TCM AutoStick configuration and delayed 3-4 shifts. No EMCC and early 3-4 shifts for a few minutes after engine is started.

Possible causes:
- Open or shorted bus circuits from BCM
- TCM