Fuel Pressure Sensor Input Circuit Low

The fuel pressure sensor, which measures fuel pressure in the system, is sending a voltage below its expected range, indicating a possible issue with the sensor or wiring.

The Electronic Control Module (ECM) expects a voltage signal from the fuel pressure sensor typically between 0.5 to 4.5 volts. A signal below 0.5 volts triggers this fault code.

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.

1. 11. Inspect the wiring and connectors related to the fuel pressure sensor for damage or corrosion. Check for loose connections. Decision: If damaged, repair wiring and retest.
2. 22. Use a multimeter to measure the voltage output of the fuel pressure sensor with the ignition on (engine off). Decision: Expected voltage should be between 0.5 to 4.5 volts. If below 0.5 volts, proceed to step 3; if above 4.5 volts, consider replacing the sensor.
3. 33. With the engine running, check fuel pressure using a gauge to confirm that it's within manufacturer specifications. Decision: If fuel pressure is low, address the cause of low pressure; if fuel pressure is normal, proceed to step 4.
4. 44. Test the fuel pressure sensor itself using a scan tool or multimeter. Decision: If the sensor is outside expected specifications, replace it; if within specifications, further diagnose the ECM.

• Faulty fuel pressure sensor
• Damaged or corroded wiring harness
• Poor electrical connection
• Leaking fuel system components
• Faulty ECM

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