Fuel Level Sensor A Circuit Range/Performance Problem
The fuel level sensor signal is reading outside of the expected range.
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What it means (plain English)
The fuel level sensor measures how much fuel is in the tank, and if it's too low (below 0.5 volts) or too high (above 4.5 volts), the computer throws this code.
What the computer is actually seeing
The ECM sees fuel level voltages that fluctuate between 0.5V and 4.5V; anything outside this range indicates a problem with the sensor or circuit.
What a healthy reading looks like
Expected fuel level voltage should be between 0.5V (empty) and 4.5V (full) with a linear increase between those points as fuel is added.
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.
- 11. Check the fuel level in the tank, ensuring it's not lower than specified.
- 22. Inspect the wiring and connectors for damage, corrosion, or loose connections, especially at the fuel tank area.
- 33. Disconnect the fuel level sensor and measure the voltage at the connector. It should be within 0.5V to 4.5V; if not, check wiring.
- 44. If the voltage is good, reconnect and measure the resistance of the fuel level sensor. It should vary smoothly with fuel level; if it doesn't, replace the sensor.
- 55. If replaced and issues persist, more in-depth ECM diagnostics are needed.
Common causes
- Faulty fuel level sensor
- Damaged wiring or connectors
- Corrosion in sensor plugs
- Fuel tank contamination
Typical repair cost
$$ (200-600)
Related codes
Frequently asked questions
Can I still drive my vehicle with this code?
Yes, but gauge readings may be incorrect, and running out of fuel is a risk.
Will this code come back after clearing it?
If the underlying issue isn't resolved, it will likely return.
What happens if I ignore this code?
It could lead to a situation where you run out of fuel unexpectedly.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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