Differential Pressure Sensor Circuit Low Input
Signals from the differential pressure sensor are below normal.
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What it means (plain English)
The engine control unit (ECU) is getting readings from the differential pressure sensor that are too low, which typically means there's an issue with the sensor circuit or the sensor itself.
What the computer is actually seeing
The ECU expects a voltage range of 0.5V to 4.5V from the differential pressure sensor, but is seeing values below 0.5V consistently.
What a healthy reading looks like
Voltage should be between 0.5V to 4.5V depending on pressure; if it reads less than 0.5V, it triggers this fault code.
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 for obvious wiring issues: Inspect the wiring and connectors of the differential pressure sensor for damage or corrosion.
- 22. Measure voltage at the differential pressure sensor: With the key on, engine off, check the voltage at the sensor connector. Voltage should be between 0.5V and 4.5V.
- 33. If voltage is below 0.5V, check the ground circuit: Measure resistance to ground; resistance should be less than 5 ohms, indicating a good ground.
- 44. If the ground is fine, check the sensor output while running: Start the engine and measure the voltage again. It should change based on pressure changes; if it stays low, replace the sensor.
- 55. If the output is still low after replacing the sensor, investigate fluid levels and look for blockages in the system.
Common causes
- Faulty differential pressure sensor
- Wiring issues or damaged connectors in the sensor circuit
- Low fluid levels affecting pressure readings
- Blocked exhaust or intake causing pressure anomalies
Typical repair cost
$$
Related codes
Frequently asked questions
Can I keep driving with this code?
It's not recommended to drive if you're experiencing performance issues, as it can impact emissions and performance.
Will this issue come back after fixing?
If the root cause is resolved, like a sensor replacement or wiring repair, it should not return.
Why does this code appear with low fuel pressure?
Low fuel pressure can affect sensor performance, leading to incorrect voltage readings.
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