U1403

U1403-IMPLAUSIBLE FUEL LEVEL SIGNAL RECEIVED
For a complete wiring diagram, refer to the Wiring Information.
Theory of Operation

The Totally Integrated Power Module (TIPM) isn't receiving a fuel volume signal over CAN B from the Cluster Module. The TIPM has to send the PCM a fuel volume signal over CAN C. The signal the TIPM sends over CAN C is implausible.

- When Monitored:
Continuously with the ignition on.

- Set Condition:
The fuel volume message the Powertrain Control Module (PCM) is receiving is implausible.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

1. ACTIVE DTC
1. Ignition on, engine not running.
2. With a scan tool read DTCs.

Is the DTC Active at this time?

Yes

- Go To 2

No

- Perform the INTERMITTENT CONDITION diagnostic procedure. Intermittent Condition Test

2. CAN B BUS HARDWARE DTCs ALSO ACTIVE
1. With a scan tool check for DTCs in the TIPM.

Are any CAN B Hardware related DTCs active at this time?

Yes

- Testing and Inspection Perform the appropriate diagnostic procedure.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Replace and program the Powertrain Control Module.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.