Data Erratic, Least Significant Bit (LSB) of Fuel Pressure Sensor
Fuel pressure sensor is sending unstable voltage signals.
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What it means (plain English)
The fuel pressure sensor should output a steady voltage between 0.5V (low pressure) and 4.5V (high pressure). If it bounces around, it signals a problem.
What the computer is actually seeing
The ECM is reading fluctuating voltages from the fuel pressure sensor, which should be stable. The expected range for normal operation is between 0.5V to 4.5V with a consistent pattern based on the fuel system's current pressure.
What a healthy reading looks like
Normal fuel pressure sensor readings should range from 0.5V at low pressure (around 5 psi) to 4.5V at high pressure (around 70 psi).
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 wiring and connectors for damage or corrosion. Fix any visible issues.
- 22. Connect a scan tool and observe the fuel pressure sensor voltage while the engine is running. It should be stable within the expected values of 0.5V to 4.5V.
- 33. If the voltage is erratic, replace the fuel pressure sensor and retest.
- 44. If voltage readings are stable, check for fuel system leaks or restrictions, ensuring proper operation.
- 55. Clear the code and test drive to see if it returns.
Common causes
- Faulty fuel pressure sensor
- Wiring issues or corrosion in connectors
- Fuel system air leaks or blockages
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable, but fix soon as it can affect engine performance.
Will the code come back after clearing it?
If the underlying problem isn't fixed, yes, it will likely return.
Why does this code pair with other fuel pressure codes?
Multiple codes indicate issues in the fuel pressure system, often related to the sensor or wiring.
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