U1403

U1403-IMPLAUSIBLE FUEL LEVEL SIGNAL RECEIVED

For a complete wiring diagram, refer to the Wiring Information.

Theory of Operation

The Body Control Module (BCM) transmits the fuel level message to the Powertrain Control Module (PCM) over the CAN C bus.

- When Monitored:
Ignition on.

- Set Condition:
The fuel level message that the Powertrain Control Module (PCM) is receiving is implausible. The circuit is continuously monitored.





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

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. Intermittent Condition Test.

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

Are any other CAN Bus DTCs active?

Yes

- Perform the appropriate diagnostic procedure Testing and Inspection.

No

- Replace and program the Powertrain Control Module (PCM). PCM/ECM Reprogramming.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.