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 from the Fuel Level Sensor. The PCM received the Fuel Level signal from the TIPM over the CAN C Bus circuit. The signal the TIPM is sending over CAN C is implausible.

- When Monitored:
Ignition on.

- Set Condition:
The fuel level message the PCM is receiving is implausible. The circuit is continuously monitored. One Trip fault.





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

Diagnostic Test

1. ACTIVE DTC

NOTE: Diagnose all communication DTCs before continuing.

NOTE: For vehicle communication problems, use the scan tool to refer to the Network Review Screen. The screen depicts a high level view of the vehicle network. Fault and problem areas appear in red. Selecting any of the network components allows access to the source of the problem.

1. Ignition on, engine not running.
2. With a scan tool, select View DTCs.

Is the status Active for this DTC?

Yes

- Go To 2

No

- Perform the INTERMITTENT CONDITION diagnostic procedure. PCM Intermittent Condition Test.

2. OTHER CAN BUS COMMUNICATION DTCS ALSO ACTIVE
1. With a scan tool select View DTCs in the TIPM.

Are any other CAN Bus DTCs active?

Yes

- Testing and Inspection and perform the appropriate diagnostic procedure.

No

- Manufacturer Code Charts and perform the Stored Lost Communication DTCs diagnostic procedure.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.