Powertrain

Test 1 - 2:

Test 3:

SYMPTOM
U0101-NO BUS MESSAGE FROM TRANS CONTROL MODULE

WHEN MONITORED
Equipped with automatic transmission. The ignition on and battery voltage greater than 10 volts.

SET CONDITION
No bus messages from the TCM for 20 seconds, two trips required. One Trip Fault. Three good trips to turn off the MIL.

POSSIBLE CAUSES
- DTC reset
- PCM fused ignition switch output circuit
- PCI BUS unable to communicate with DRBIII
- PCM