Fuel Pressure Sensor B Circuit Failure
Indicates an issue with the fuel pressure sensor B's circuit.
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What it means (plain English)
The computer is not getting a valid signal from the fuel pressure sensor B, which measures how much pressure is in the fuel system. This means your engine may not get enough fuel, causing performance issues.
What the computer is actually seeing
The computer expects a voltage signal from the fuel pressure sensor B between 0.5V and 4.5V, depending on the pressure measured. If the signal is outside this range or missing, it triggers the fault code.
What a healthy reading looks like
0.5V to 4.5V signal from sensor at varying pressures; normal operational pressure should be around 55-65 psi (pounds per square inch) for most systems.
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 wiring and connectors for Fuel Pressure Sensor B. Look for corrosion, breaks, or loose connections. If bad, repair/replace.
- 22. Verify the fuel level – ensure it's above a quarter tank. Top up if low and see if the code clears.
- 33. Measure voltage at the sensor with the ignition on (engine off). Should be within 0.5V to 4.5V. If not, suspected wiring issues.
- 44. If voltages are good, test the fuel pressure using a gauge. Should be 55-65 psi. If low, check the fuel pump and filters.
- 55. If all values are correct, replace the Fuel Pressure Sensor B.
Common causes
- Wiring issues (shorts or breaks) in the sensor circuit
- Faulty fuel pressure sensor B
- Corroded or loose connectors at the sensor
- Plugged fuel filters or low fuel levels affecting pressure
- Bad fuel pump affecting pressure readings.
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
No, it's not safe. The engine may not run properly and could stall, risking further damage.
Will this issue come back after repairs?
If all related components are checked and repaired, the code shouldn't return.
Why do I see this code alongside SPN 1005?
SPN 1005 indicates a fault with the fuel pressure signal; it's common when there's an issue with the sensor circuit.
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