Diagnostic Test
- VERIFY THE DIAGNOSTIC TROUBLE CODE (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.
Is this DTC active?
Yes
- Go to step 2
No
- Refer to the Stored Lost Communication test procedure. Refer to Non-DTC Diagnostics/Communication - Diagnosis and Testing
- With the scan tool, read active DTCs.
- 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.
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 step 3
- With the scan tool, read all active DTCs from all modules.
- VERIFY THAT THE FDCM IS ACTIVE ON THE BUS
- Turn the ignition on.
- With the scan tool, select Network View and select Advanced.
- Verify that the FDCM is active on the bus.
Is the FDCM active on the bus?
Yes
- Go to step 4
No
- Refer to the No Response test procedure. Refer to Non-DTC Diagnostics/Communication - Diagnosis and Testing
- CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS
- With the scan tool, select Network View and select Advanced.
Is there more than one module with active DTCs "Logged Against" the FDCM?
Yes
- Replace/update the Final Drive Control Module in accordance with the Service Information.
- Perform the FDCM VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure
No
- Replace/update the module that set this DTC in accordance with the Service Information.
- Perform the appropriate VERIFICATION TEST.
- With the scan tool, select Network View and select Advanced.