Engine Intake Manifold Pressure - Sensor Out of Range
The engine intake manifold pressure sensor is reporting readings outside its specified limits.
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What it means (plain English)
The intake manifold pressure sensor measures how much air is being drawn into the engine. If it shows too high or too low a pressure, it can cause performance issues because the engine can't manage air-fuel mixing efficiently.
What the computer is actually seeing
The engine control module (ECM) expects the intake manifold pressure to be within a specific range, typically around 20 to 30 inHg at idle. If it's above 30 inHg or below 5 inHg, it triggers this code.
What a healthy reading looks like
Normal intake manifold pressure should be between 10.5 to 29.5 inHg at sea level, depending on engine load and conditions.
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 connector leading to the intake manifold pressure sensor. Ensure there are no frays or corrosion. Decision: If damaged, repair or replace.
- 22. Use a multimeter to check the sensor output voltage. Key-on, engine-off should show a voltage around 0.5 to 1.0 volts. Decision: If out of range, the sensor may be faulty.
- 33. Perform a vacuum check using a vacuum gauge connected to the intake manifold. Expect readings between 10.5 to 29.5 inHg. Decision: If readings are incorrect, inspect for vacuum leaks or blockages.
- 44. Check for exhaust or boost leaks if the pressure is too high. Make sure all connections are secure. Decision: If leaks found, repair them before retesting.
Common causes
- Faulty intake manifold pressure sensor
- Wiring or connector issues
- Vacuum leaks in the intake system
- Exhaust or boost leaks
- Faulty ECM calibration
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Moderate severity suggests you should fix it soon, but you may be able to drive short distances with caution.
Will the code come back after clearing?
If the underlying issue isn't resolved, the code will likely reappear after some driving.
Why does this code sometimes relate to other codes?
It can trigger alongside other faults that affect air intake and fuel management, leading to performance issues.
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