66 No CCD Messages From TCM

NAME OF CODE:
No CCD Message From Transmission Control Module (TCM).

WHEN MONITORED:
Anytime the ignition is ON.

SET CONDITION:
No CCD messages are received from the TCM for 10 seconds.

THEORY OF OPERATION:
The PCM and TCM communicate across the CCD bus system. Information is needed from either module to operate their respective systems.

POSSIBLE CAUSES:
- Open CCD Bus (+) or (-) circuit between the modules.
- TCM not powered up
- TCM failure
- PCM failure