Intake Manifold Pressure - Signal Above Normal, Millibar
The ECM detects intake manifold pressure is too high.
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What it means (plain English)
The engine control module (ECM) monitors the intake manifold pressure. If it reads above the normal range, it indicates a possible overboost condition or a sensor fault.
What the computer is actually seeing
The ECM expects manifold pressure to be between 35-102 kPa at idle. A reading over 102 kPa triggers this code.
What a healthy reading looks like
Normal intake manifold pressure ranges between 35 kPa (5 psi) to 102 kPa (15 psi) during idle conditions, depending on engine specifications.
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 integrity of the wiring and connectors for the intake manifold pressure sensor. Look for damage or corrosion.
- 2Inspect the intake system for any boost leaks; reconnect intake and turbo hoses securely if needed.
- 3Check the air filter; replace if clogged.
- 4Measure the voltage at the intake manifold pressure sensor: expect around 0.5V at 35 kPa and 4.5V at 102 kPa. If you don't see the appropriate values, replace the sensor.
- 5If the voltage readings are normal, check for any boost pressure exceeding the expected values during operation. If overboost is found, inspect the turbocharger and wastegate.
Common causes
- Faulty intake manifold pressure sensor
- Boost pressure leak
- Faulty turbocharger or wastegate operation
- Clogged air filter or intake system restrictions
- ECM software issue
Typical repair cost
$$-$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not ideal; you may experience reduced power. Drive carefully and fix soon.
Will this problem come back after fixing?
If you resolve the cause, it should stay cleared unless there's a recurring issue.
Does this code relate to a turbo issue?
Yes, overboost can indicate turbocharger problems or wastegate faults.
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