Engine Intake Manifold Pressure
The engine's intake manifold pressure is outside of expected parameters.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The engine is monitoring how much air is in the intake manifold, and it sees a value that shouldn't be there for a healthy engine, which affects performance.
What the computer is actually seeing
The engine control module (ECM) expects intake manifold pressure to be between 20-30 inHg during normal operation. If pressure drops below 10 inHg or goes above 40 inHg, it will set this code.
What a healthy reading looks like
Intake manifold pressure should typically read between 20-30 inHg; below 10 inHg or above 40 inHg triggers this 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.
- 1Check for visible vacuum leaks in the intake system first. Confirm all hoses are connected and in good condition.
- 2Inspect the MAP sensor connector and wiring for damage or corrosion.
- 3Using a scan tool, monitor the MAP sensor output at idle; it should be around 20 inHg. If it's fluctuating wildly or reading low/high, replace the MAP sensor.
- 4Check the intake manifold for blockages or carbon buildup; clean if necessary and retest.
Common causes
- Vacuum leaks in the intake manifold
- Faulty MAP (Manifold Absolute Pressure) sensor
- Blocked intake system
- Faulty connections or harness issues
Typical repair cost
$$ - $$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best to fix this code soon, as it can affect engine performance and emissions.
Will this code come back after I clear it?
If the underlying issue isn't resolved, the code is likely to return.
Why does this code pair with other codes?
Issues in the intake system can trigger multiple related sensors and codes, indicating systemic problems.
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