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Home >> Jeep >> 2008 >> Commander Overland, 4WD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> DTCS U0001 To U1418, System Checks, Checking Pcm Power And Ground Circuits, Engine Cranks But No Start >> U1403-Implausible Fuel Level Signal Received >> Possible Causes

Possible Causes

Possible Causes 
CAN B OPEN OR SHORTED
CLUSTER MODULE
FRONT CONTROL MODULE (FCM)
POWERTRAIN CONTROL MODULE (PCM)

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.

The Front Control Module isn't receiving a fuel level signal over CAN B from the Cluster Module. The FCM has to send the PCM a fuel level signal over CAN C. The signal the FCM sends over CAN C is implausible.

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