Inlet Pressure Sensor Circuit Low
The inlet pressure sensor circuit is registering a low voltage signal.
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What it means (plain English)
The inlet pressure sensor is supposed to send a voltage that corresponds to the pressure in the intake manifold, but it's sending a signal that's too low, usually below 0.5 volts when it should be around 1 to 5 volts depending on system design.
What the computer is actually seeing
The ECU sees a low voltage reading from the inlet pressure sensor, typically below 0.5V when it expects a pressure range signal based on the engine load conditions.
What a healthy reading looks like
Normal voltage outputs should be between 1.0V and 5.0V corresponding to pressure levels, typically 0 to 30 inHg (inches of mercury).
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 the wiring and connectors from the inlet pressure sensor to the ECU for damage or corrosion. Fix any issues found and retest.
- 22. Measure the voltage at the inlet pressure sensor connector with the key on (engine off). Expected range is 1.0V to 5.0V. If less than 0.5V, proceed to the next step.
- 33. With the engine running, check the voltage again. If still low and wiring checks out, replace the inlet pressure sensor and retest.
- 44. If the new sensor also shows low voltage, check the ground and power supply to the sensor for proper voltage and good ground connection.
Common causes
- Faulty inlet pressure sensor
- Wiring issues such as short circuits or breaks
- Corroded connectors between the sensor and the ECU
- Vacuum leaks in the intake system
- ECU failure
- Faulty power supply to the inlet pressure sensor
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I drive the vehicle with this code?
Yes, but performance may be affected. It's recommended to fix it soon.
Will this code come back after clearing it?
If the underlying issue is not resolved, the code is likely to return.
Why does this code pair with other SPN codes?
Many inlet pressure issues cause a ripple effect, impacting other system sensors or components.
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