Fuel Level Sensor Circuit Fault
Indicates a problem with the fuel level sensor circuit in the fuel system.
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What it means (plain English)
The fuel level sensor in the tank is malfunctioning or the wiring is faulty, which means the computer can't correctly read how much fuel is left.
What the computer is actually seeing
The engine control unit (ECU) expects a voltage from the fuel level sensor in the range of 0 to 5 volts. If it sees a voltage outside this range, it sets this fault.
What a healthy reading looks like
Normal operation should show 0 volts when empty and up to 5 volts when full. A reading of 2.5 volts typically indicates a half tank.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 1Check fuel level sensor wiring for damage or shorts. Look for frayed wires or exposed metal.
- 2Inspect connectors for corrosion or loose connections — clean and secure as necessary.
- 3Use a multimeter to measure sensor output voltage at the fuel level connector. Expect 0-5 volts while moving through various fuel levels. If the voltage is out of range, the sensor or wiring is likely faulty.
- 4If the sensor output is within range, check the ECU for fault codes or possible internal failures.
Common causes
- Damaged or shorted wiring harness
- Failed fuel level sensor
- Corroded connections at the sensor
- Faulty ECU reading
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, it's drivable but monitor fuel levels manually until fixed.
Will this code come back after repair?
If correctly diagnosed and repaired, the code shouldn't return.
Why does this code sometimes register with SPN 5562?
SPN 5562 indicates a similar sensor issue; both are part of the fuel level monitoring system.
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