Fuel Level Sensor - Circuit Short to Ground
Indicates a fault in the fuel level sensor circuit due to a short to ground.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The fuel level sensor is sending a signal that shows the tank is empty when it may not be, due to a wiring issue, specifically a short circuit.
What the computer is actually seeing
The engine control module (ECM) detects a voltage drop on the fuel level sensor circuit, usually below 0.1 volts when it should be between 0.5 and 4.5 volts depending on the tank level.
What a healthy reading looks like
The fuel level sensor should output a voltage that varies between approximately 0.5 volts (empty) and 4.5 volts (full).
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. Inspect the wiring and connectors for damage, corrosion, or loose connections. If found, repair or replace the affected components. Decision: If wiring is good, proceed to step 2.
- 22. Check the fuel level sensor's resistance with a multimeter. It should vary according to the level in the tank. If there is no variation or it's open, replace the sensor. Decision: If sensor is bad, replace it; if not, proceed to step 3.
- 33. Use a scan tool to check for additional codes. If other codes point to a common issue, address those before continuing. Decision: Resolve any related issues found before further diagnosis.
Common causes
- Damaged wiring in the fuel level sensor circuit
- Corroded or loose connectors
- Faulty fuel level sensor
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this fault?
It's drivable, but you'll have unreliable fuel level readings and potential run-out issues.
Will this code come back after clearing it?
If the underlying issue isn't resolved, the code will likely return.
Why does this code sometimes show alongside SPN 4229?
SPN 4229 indicates an open circuit in the same fuel level sensor circuit, which can occur with similar wiring failures.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →