U0101

Test 1:

Test 2 - 3:

SYMPTOM
U0101-NO TRANSMISSION BUS MESSAGE

WHEN MONITORED
Equipped with automatic transmission. Engine Running Battery voltage greater than 10 volts.

SET CONDITION
No bus messages are received from the TCM for 20 seconds, two trips required.

POSSIBLE CAUSES
- PCI BUS unable to communicate with DRBIII(R)
- (F12) Fused ignition switch output (off-run-start)
- Intermittent condition
- PCM