U0676Lost Communication With Fuel Level Sensor A
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- Fuel level sensor A is the main tank sender. Usually it is a float-driven resistor read as a voltage, and U0676 only applies where the sender itself reports digitally and its messages stop. Public documentation of this code from any manufacturer is lacking. In its 2024 summary Ford treats sender A as a resistance: below 5 ohms or above 200 ohms within 30 s are circuit faults, more than 100 jumps of over 40 % are noise, and stuck checks need 100 to 120 miles. GM's 25OBDG03A lets the float feed the engine controller directly or a fuel tank zone module, which forwards the value, and pauses its range checks while a communication fault is active. CARB needs the level for EVAP testing and misfire disablement at low fuel, so the gauge may be wrong and those monitors stay incomplete.
- What you may notice
- Fuel gauge reads empty, full or freezes
- Range display missing or wrong
- Check engine light, EVAP readiness not set
- Likely causes
- LikelyWiring at the tank or fuel pump flange damaged or corroded
- PossibleElectronics of the level sender failed
- PossibleModule that reads or forwards the level faulty
- RareConnector under the vehicle not latched or water-damaged
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.