Network, generic

U0676 Lost Communication With Fuel Level Sensor A

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modeNo

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.

Likely causes

Wiring at the tank or fuel pump flange damaged or corroded

Electronics of the level sender failed

Module that reads or forwards the level faulty

Connector under the vehicle not latched or water-damaged

Symptoms

Fuel gauge reads empty, full or freezes
Range display missing or wrong
Check engine light, EVAP readiness not set

Repair estimate

DifficultyMediumWorkshop job

Parts and labour€60–600

Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

fuel level sensor avehicle bus wiring

References: law.cornell.edu, gsi.ext.gm.com, fordservicecontent.com.