All Wheel Drive Module (AWD)

U0100-LOST COMMUNICATION WITH ECM/PCM

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

- When Monitored:
With the ignition on.

Battery voltage between 10 and 16 volts.

Ignition Off Draw (IOD) fused installed.

Totally Integrated Power Module (TIPM) is configured correctly.

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





1. VERIFY DTC IS ACTIVE

NOTE: For vehicle communication problems, use the scan tool to refer to the Network Review Screen. The screen depicts a high level view of the vehicle network. Fault and problem areas appear in red. Selecting any of the network components allows access to the source of the problem.

1. Ignition on, engine off.
2. With the scan tool, read the DTCs.

Is this DTC active?

Yes

- Go To 2

No

- Stored Lost Communication DTCs Perform the Stored Lost Communication DTC diagnostic procedure.

2. CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS
1. With the scan tool, read all active DTCs from all modules.

NOTE: Check for TIPM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs.

Does the scan tool display any active DTCs to the conditions listed above?

Yes

- Totally Integrated Power Module (TIPM) Perform the appropriate diagnostic procedure.

No

- Go To 3

3. VERIFY THAT THE ECM/PCM IS ACTIVE ON THE BUS
1. Turn the ignition on.
2. With the scan tool, select Network Diagnostics.
3. Verify that the ECM/PCM is active on the bus.

Is the ECM/PCM active on the bus?

Yes

- Go To 4

No

- No Response From PCM (Powertrain Control Module) - GPEC No Response From PCM (Powertrain Control Module) - GPEC Perform the No Response from ECM/PCM diagnostic procedure.

4. CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS
1. With the scan tool, select Network Diagnostics.

Is there more than one module with active DTCs Logged Against the ECM/PCM?

Yes

- Replace/update the ECM/PCM.
- Perform the appropriate VERIFICATION TEST. Verification Tests for gas engine applications.

No

- Replace/update the module that set this DTC.
- Perform the AWD VERIFICATION TEST. AWD Control Module Verification Test.