Intake Manifold Pressure - Abnormally High
The engine's intake manifold pressure is higher than expected.
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 computer is seeing pressure in the intake manifold, like a vacuum, that’s way above normal. Normally it should be around 20-30 inHg at idle and not exceed 35 inHg under load. If it’s hitting 40 inHg or more, something's off.
What the computer is actually seeing
The Engine Control Module (ECM) monitors the pressure in the intake manifold. If it sees values significantly greater than 35 inHg, it triggers the fault code.
What a healthy reading looks like
Normal intake manifold pressure should be between 20 inHg (idle) and 35 inHg (max load).
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 wiring and connectors to the MAP sensor for damage or corrosion. Decision: If damaged, repair and retest; if okay, proceed to step 2.
- 22. Measure the intake manifold pressure with a vacuum gauge while the engine is running. Decision: If pressure exceeds 35 inHg under load, continue to step 3; if normal, consider recalibrating or replacing the MAP sensor.
- 33. Inspect the air intake system for obstructions like a clogged air filter. Decision: If obstructed, replace the air filter; if clear, proceed to step 4.
- 44. Check for vacuum leaks in hoses connected to the intake manifold. Decision: If a leak is found, repair the leak; if no leaks, proceed to step 5.
- 55. Check the engine’s exhaust system for restrictions. Decision: If a restriction is found, repair the exhaust; if clear, replace the MAP sensor.
Common causes
- Clogged air filter
- Vacuum leak
- Faulty MAP sensor
- Restricted exhaust
- Inlet manifold blockage
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally drivable, but performance will be compromised. Best to fix it soon.
Can this code come back after clearing it?
Yes, if the underlying issue isn't fixed, it will likely return.
Why does it sometimes pair with a knock sensor code?
High manifold pressure can affect how the engine runs, which may trigger knock sensor codes.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →