U0101

Test 1 - Test 2:

Test 3:

SYMPTOM
U0101-NO BUS MESSAGE FROM TRANS CONTROL MODULE

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

SET CONDITION
An open circuit on the (F11) Fused Ignition Switch Output circuit. No bus messages from the TCM for 20 seconds, two trips required.

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