U1403 on 2008-2014 Dodge Challenger (SE, SXT, R/T, SRT8, Rallye) — Implausible Fuel Level Signal Received
1 vehicles · 1 makes · $700-$1,100 repair
Most Reported On
U1403 is an OBD-II diagnostic trouble code meaning “Implausible Fuel Level Signal Received.” A Chrysler/Dodge/Jeep/Ram manufacturer-specific network code. The fuel level sensor is a direct hardwired input to the Body Control Module (on some platforms the instrument cluster/CCN), which broadcasts the fuel level message to the Powertrain Control Module over the CAN C bus. U1403 sets when the fuel level message the PCM receives is implausible. The usual complaint is a fuel gauge that reads wrong, sticks at full or empty, or swings erratically, and distance-to-empty and the low-fuel warning become unreliable. The engine itself normally runs fine, but you can be stranded by trusting a bad gauge. This code is most commonly reported on 2008-2014 Dodge Challenger (SE, SXT, R/T, SRT8, Rallye), with repair costs ranging from $700 to $1,100.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
U1403 does not use the standard P/B/C/U prefix. It may be a manufacturer-specific code, so verify that a scanner supports your exact year, model and module before buying.
FAQ
What does U1403 mean?
U1403 stands for "Implausible Fuel Level Signal Received." A Chrysler/Dodge/Jeep/Ram manufacturer-specific network code. The fuel level sensor is a direct hardwired input to the Body Control Module (on some platforms the instrument cluster/CCN), which broadcasts the fuel level message to the Powertrain Control Module over the CAN C bus. U1403 sets when the fuel level message the PCM receives is implausible. The usual complaint is a fuel gauge that reads wrong, sticks at full or empty, or swings erratically, and distance-to-empty and the low-fuel warning become unreliable. The engine itself normally runs fine, but you can be stranded by trusting a bad gauge.
What are the most common causes of U1403?
The most common causes of U1403 are: Failed fuel level sending unit / sender card in the in-tank fuel pump module (most common), Open, shorted, or damaged wiring in the fuel level sensor circuit, Corroded or damaged connector at the top of the fuel tank, Faulty body control module or instrument cluster (whichever reads the sender on that platform), CAN C bus communication fault or poor ground affecting the message to the PCM, Aftermarket fuel pump module with an out-of-spec sender. The specific cause varies by vehicle.
How much does it cost to fix U1403?
Repair costs for U1403 range from $700 to $1,100, depending on the vehicle and root cause.
Which vehicles are affected by U1403?
Au7o has documented U1403 across 1 vehicle models from 1 manufacturers: Dodge.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.