Powertrain Control Module (PCM) - NGC

U0103-LOST COMMUNICATION WITH ELECTRIC GEAR SHIFT MODULE

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

- When Monitored:
With the ignition on.

Battery voltage between 10 and 16 volts.

Ignition Off Draw (IOD) fuse installed.

Totally Integrated Power Module (TIPM) is configured correctly.

- Set Condition:
Bus messages not received from the Electric Gear Shift Module (ESM) (Shifter Lever Assembly) for approximately 500 ms.





1. VERIFY THE DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE

NOTE: Make sure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.

1. Using the scan tool, read active DTCs.

Is this DTC active?

Yes

- Go To 2

No

- Stored Lost Communication DTCs and perform the STORED LOST COMMUNICATION DTCS diagnostic procedure.

2. CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS
1. Using 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

- Go to and perform the appropriate diagnostic procedure.

No

- Go To 3

3. VERIFY THE SHIFTER LEVER ASSEMBLY OR THE ELECTRONIC SHIFT MODULE (ESM) IS ACTIVE ON THE BUS
1. Turn the ignition on.
2. Using the scan tool, select ECU View.
3. Verify the ESM is active on the bus.

Is the ESM active on the bus?

Yes

- Go To 4

No

- Stored Lost Communication DTCs and perform the appropriate NO RESPONSE FROM ESM diagnostic procedure.

4. CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS
1. Using the scan tool, select Network View and select Advanced.

Is there more than one module with active DTCs "Logged Against" the Shifter Lever Assembly (NAG 1 Only) or if applicable the Electronic Shift Module (Column NAG 1)?

Yes

- Replace/update the Shifter Lever Assembly (NAG 1 Only) or if applicable the Electronic Shift Module (Column NAG 1).
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Replace/update the module that set this DTC.
- Perform the appropriate verification test for the module being replaced. If there is no verification test for the associated module perform the BODY VERIFICATION TEST. Body Verification Test.