Powertrain Control Module (PCM)

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) fused installed.

Front Control Module (FCM) is configured correctly.

- Set Condition:
Bus messages not received from the Electric Gear Shift Module (shift lever assembly) for approximately 500ms.





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. With the scan tool, read active DTCs.

Is this DTC active?

Yes

- Go To 2

No

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

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

NOTE: Check for FCM 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 THAT THE SHIFT LEVER ASSEMBLY IS ACTIVE ON THE BUS
1. Turn the ignition on.
2. With the scan tool, select Network View and select Advanced.
3. Verify that the Shift Lever Assembly is active on the bus.

Is the Shift Lever Assembly active on the bus?

Yes

- Go To 4

No

- Perform the No Response From ESM diagnostic procedure. No Response From ESM (Shift Lever Assembly)

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

Is there more than one module with active DTCs "Logged Against" the Shift Lever Assembly?

Yes

- Replace/update the Shifter Lever Assembly.
- Perform the NAG1 TRANSMISSION VERIFICATION TEST. NAG1 Transmission Verification Test

No

- Replace/update the module that set this DTC.
- Perform the appropriate VERIFICATION TEST. Verification Tests