Inlet Manifold Pressure Sensor - Circuit Range/Performance Problem
The Inlet Manifold Pressure Sensor is reporting readings outside of expected range.
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What it means (plain English)
The sensor that measures air pressure in the intake manifold is sending a signal that's too high or too low, which means the engine's computer can't adjust the fuel mix right and might make the engine run poorly.
What the computer is actually seeing
The engine control module (ECM) expects the manifold pressure to be within specified parameters based on engine load and throttle position. If it sees values outside of this range (e.g., less than 0.5V or more than 4.5V for a 5V reference sensor), it triggers this fault code.
What a healthy reading looks like
Normal pressure readings for the manifold should generally fall between 0-5V depending on the engine load, and should indicate barometric pressure during idle (around 14.7 psi at sea level).
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.
- 1Check the wiring and connector to the inlet manifold pressure sensor for damage or corrosion. Repair if necessary.
- 2Measure the voltage at the sensor connector with the key on and engine off. It should be close to 5V. If not, check the wiring back to the ECM.
- 3Start the engine and recheck the voltage at the sensor. It should fluctuate with engine load. If it remains static or out of the expected range, replace the sensor.
- 4Inspect the intake manifold for vacuum leaks that could cause incorrect pressure readings.
Common causes
- Faulty inlet manifold pressure sensor
- Wiring issue or short in the sensor circuit
- Vacuum leaks in the intake manifold
- Faulty engine computer (ECM)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally drivable, but may experience reduced power and fuel efficiency. Fix soon.
Will this code come back after resetting?
If the underlying issue isn't resolved, yes, it will reappear.
Why does this code frequently pair with SPN 2327?
SPN 2327 typically indicates a related issue with the pressure circuit, indicating multiple faults in pressure sensing.
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