PCM/ECM Messages Not Received

PCM/ECM MESSAGES NOT RECEIVED

WHEN MONITORED
With the ignition on.

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

POSSIBLE CAUSES
- PCM/ECM power and ground
- CAN C BUS circuit fault
- Body control module

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.

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

YES: Go To 2
NO: Refer to Trouble Code Diagnostic Charts and 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.

Q: 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.