Fuel Level Sensor Circuit Malfunction
The fuel level sensor circuit is malfunctioning, preventing the PCM from accurately reading the fuel tank level. This code sets when the sensor signal is implausible, erratic, or out of range, typically caused by sensor failure, wiring issues, or fuel slosh detection during rapid level changes.
What You Might Notice
- Fuel gauge reads empty or full constantly
- Fuel gauge fluctuates erratically
- Check engine light illuminated
- Inaccurate fuel level display
- Potential fuel pump issues if sender is stuck
Most Common Causes
- 1
Fuel level sensor failure
The fuel tank sender unit or level sensor has failed electrically or mechanically, sending incorrect resistance values to the PCM.
- 2
Wiring or connector issues
Corroded, loose, or damaged wiring and connectors in the fuel level sensor circuit prevent proper signal transmission.
- 3
Fuel slosh or rapid level changes
Refueling with the engine running or ignition on, or rapid fuel consumption, causes the sensor to detect abnormal level fluctuations.
- 4
PCM or module malfunction
A faulty powertrain control module or fuel pump control module may misinterpret valid sensor signals.
How to Diagnose It
- 1
Check Fuel level sensor failure — The fuel tank sender unit or level sensor has failed electrically or mechanically, sending incorrect resistance values to the PCM.
- 2
Check Wiring or connector issues — Corroded, loose, or damaged wiring and connectors in the fuel level sensor circuit prevent proper signal transmission.
- 3
Check Fuel slosh or rapid level changes — Refueling with the engine running or ignition on, or rapid fuel consumption, causes the sensor to detect abnormal level fluctuations.
- 4
Check PCM or module malfunction — A faulty powertrain control module or fuel pump control module may misinterpret valid sensor signals.
How to Fix It
- 1
Inspect and clean fuel level sensor connectors
Locate the fuel tank sender unit connector, disconnect it, and clean any corrosion or debris from the terminals using a wire brush and electrical contact cleaner. Reconnect and clear the code to test.
- 2
Check fuel tank sender wiring
Inspect the wiring harness from the fuel tank to the PCM for breaks, pinches, or corrosion. Repair or replace damaged sections and verify continuity with a multimeter.
- 3
Replace fuel level sensor or sender unit
If testing confirms sensor resistance is out of specification or erratic, remove and replace the fuel tank sender assembly. This typically requires fuel tank access or removal.
- 4
Test and reprogram PCM if needed
After sensor replacement, verify the PCM is receiving correct signals. If the code persists with a new sensor and clean wiring, have the PCM tested or reflashed by a professional technician.
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