Powertrain Control Module (PCM)

U0100-LOST COMMUNICATION WITH THE ECM/PCM

For a complete wiring diagram, refer to the Wiring Information.

Possible Causes-U0100

- When Monitored:
Ignition run time is greater than one second.

Battery voltage between 9 and 16 volts.

Engine run time greater than three seconds.

- Set Condition:
Bus messages not received from the Powertrain Control Module (ECM/PCM) for approximately two to five seconds.





Diagnostic Test
ACTIVE DTC
1. Ignition on, engine not running.
2. With the scan tool, select view DTCs.

Is the DTC Active at this time?

Yes

- Perform the U0100-Lost Communication with ECM/PCM diagnostic procedure. Totally Integrated Power Module (TIPM)

No

- Stored Lost Communication DTCs and perform the Stored Lost Communication DTCs diagnostic procedure.