Body Control System

U0103-LOST COMMUNICATION WITH ELECTRIC GEAR SHIFT MODULE

U0103 - Lost Communication With Electric Gear Shift Module:

WHEN MONITORED
- With the ignition on
- Battery voltage between 10 and 16 volts
- IOD fuse installed
- FCM is configured correctly

SET CONDITION
Bus messages not received from the Electric Gear Shift Module (shifter lever assembly) for approximately 500ms.

POSSIBLE CAUSES
- CAN B or CAN C BUS circuits open or shorted
- DTCs related to battery voltage, ignition, or VIN messages
- FCM not configured correctly
- Shifter lever assembly
- Shifter lever assembly power and ground
- Module that set this DTC

DIAGNOSTIC TEST

1. VERIFY DTC IS ACTIVE

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

With the scan tool, read active DTCs.

Q: Is this DTC active?

YES: Go To 2
NO: Refer to the Stored Lost Communication test procedure. Stored Lost Communication DTCs
Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

2. CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCs
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.

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

YES: Diagnose and repair the DTC.
Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 3

3. VERIFY THAT THE SHIFTER LEVER ASSEMBLY IS ACTIVE ON THE BUS
Turn the ignition on.
With the scan tool, select Network Diagnostics.
Verify that the Shifter Lever Assembly is active on the bus.

Q: Is the Shifter Lever Assembly active on the bus?

YES: Go To 4
NO: Refer to Trouble Code Diagnostic Charts for a no response test procedure.
Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

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

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

YES: Replace/update the Shifter Lever Assembly.
Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Replace/update the module that set this DTC.
Perform BODY VERIFICATION TEST - VER 1. Body Verification Test