Fuel Level Sensor Circuit High Input
The fuel level sensor input signal is too high.
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What it means (plain English)
The system thinks your fuel tank is full when it's not because the sensor is reading a voltage that indicates a full tank.
What the computer is actually seeing
The fuel level sensor outputs a voltage that is typically between 0.5V (empty) and 4.5V (full). If the PCM sees a voltage above this range, it triggers the code B1457.
What a healthy reading looks like
Normal fuel level voltages should range from 0.5V to 4.5V based on tank levels. Anything above 4.5V is considered high input.
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 sensor connector for corrosion or loose pins. If found, repair or replace the connector. Decision: Is the connector good? Yes - go to step 2. No - fix the connector and retest.
- 22. Measure the voltage at the fuel level sensor with the ignition on but engine off. Expected voltage is <4.5V. Decision: Is the measured voltage over 4.5V? Yes - replace the fuel level sensor. No - check wiring harness for shorts to voltage or ground.
- 33. Inspect the wiring harness for damage or wear between the fuel level sensor and the ECM. Repair as necessary. Decision: Is the wiring intact? Yes - move to the next step. No - repair wiring and retest.
- 44. If the sensor and wiring check out, scan for additional codes that may indicate ECM issues. Decision: Are there related codes present? Yes - address related codes. No - consider reprogramming or replacing the ECM.
Common causes
- Faulty fuel level sensor
- Wiring issues or shorts in the sensor circuit
- Poor connector contacts
- ECM/PCM software glitch
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but your fuel gauge may be inaccurate, and you could run out of fuel unexpectedly.
Will this code come back after repairs?
If repairs are done correctly and no underlying issues exist, the code should not return.
Why does this code pair with others?
Codes related to the fuel system often appear together because they can share signal issues or sensor problems.
Working a real vehicle right now?
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