PCM/ECM Messages Not Received

PCM/ECM MESSAGES NOT RECEIVED

For a complete wiring diagram refer to Diagrams/Electrical.

- When Monitored:

With the ignition on.

- Set Condition:

The BCM does not receive any messages from the PCM/ECM for at least 30 seconds.





Diagnostic Test

1. ATTEMPT TO COMMUNICATE WITH THE PCM/ECM

Turn the ignition on.

With the scan tool attempt to communicate with the PCM/ECM.

Was the scan tool able to I/D or communicate with the PCM/ECM?

Yes

- Go To 2

No

- Perform the related symptom.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

2. BODY CONTROL MODULE

With the scan tool, erase the BCM DTC's.

Turn the ignition on and wait approximately 1 minute.

With the scan tool, read the BCM DTC's.

Did this DTC reset?

Yes

- Ensure the CAN C Bus circuits are not open at the BCM, if ok then replace the Body Control Module.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- The condition that set this DTC is no longer present. Using the wiring diagram/schematic as a guide, inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals.