U0114

U0114-LOST COMMUNICATION WITH FINAL DRIVE 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 Front Control Module for approximately 2 to 5 seconds.

Possible Causes
CAN B BUS CIRCUITS OPEN OR SHORTED
DTCS RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES
FCM NOT CONFIGURED CORRECTLY
FRONT CONTROL MODULE
FRONT CONTROL MODULE POWER AND GROUND
MODULE THAT SET THIS DTC
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.

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.

Is this DTC active?
Yes >> Go To 2
No >>
Refer to the Stored Lost Communication test procedure.
Perform BODY VERIFICATION TEST - VER 1. -

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.

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. -
No >> Go To 3

3. VERIFY THAT THE FCM IS ACTIVE ON THE BUS
Turn the ignition on.
With the scan tool, select Network Diagnostics.
Verify that the FCM is active on the bus.
Is the FCM active on the bus?
Yes >> Go To 4
No >>
Refer to no response test procedure.
Perform BODY VERIFICATION TEST - VER 1. -

4. CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS
With the scan tool, select Network Diagnostics.
Is there more than one module with active DTCs Logged Against the FCM?
Yes >>
Replace/update the Front Control Module.
Perform BODY VERIFICATION TEST - VER 1. -
No >>
Replace/update the module that set this DTC.
Perform BODY VERIFICATION TEST - VER 1. -