Intake Manifold Pressure Sensor Failure
Manifold pressure sensor is out of range or not responding.
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What it means (plain English)
The intake manifold pressure sensor measures the pressure inside the intake manifold. If it's faulty, the engine control module (ECM) gets the wrong information about how much air is entering the engine, affecting fuel delivery and performance.
What the computer is actually seeing
The ECM expects a voltage signal from the sensor that varies between 0.5 volts (at low pressure) to 4.5 volts (at high pressure). If the signal is outside of this range, the ECM triggers a fault code.
What a healthy reading looks like
0.5V to 4.5V corresponding to manifold pressures from vacuum to atmospheric levels (generally -14.7 psi to 0 psi).
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 intake manifold pressure sensor wiring and connector for damage. If damaged, repair or replace as necessary.
- 22. Use a multimeter to measure the voltage at the sensor while the engine is running. Check if it is between 0.5V and 4.5V. If it's not, replace the sensor.
- 33. Inspect for any vacuum leaks at the manifold or between the sensor and the intake. Repair any leaks found.
- 44. If voltage is correct and there's no vacuum leak, check the ECM for faults or update software if needed.
Common causes
- Wiring issues (frayed, shorted, or open circuits)
- Failed intake manifold pressure sensor
- Faulty ECM or software malfunction
- Vacuum leaks in the manifold
- Plugged or restricted pressure lines
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's a moderate severity code; drivability may be impacted. It's best to diagnose and repair soon.
Will this code come back after clearing it?
If the underlying issue is not resolved, yes, the code will likely return.
Why might it pair with other codes?
Multiple codes can indicate related issues in the air intake or sensor system, often connected.
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