Intake Manifold Pressure - High
Indicates that the intake manifold pressure is above the normal range.
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What it means (plain English)
The intake manifold pressure is telling the engine computer that there's more air in here than expected, which can mess up how the engine runs.
What the computer is actually seeing
The engine control module (ECM) is monitoring intake manifold pressure through a sensor. It expects the pressure to be within a specific range, typically around 30-50 kPa at idle. If it sees values above this range, it triggers the fault code.
What a healthy reading looks like
Intake manifold pressure should be approximately 30-50 kPa at idle; above 80 kPa can trigger this fault.
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 wiring and connector at the intake pressure sensor for damage or corrosion. Repair as needed.
- 2Inspect for any visible leaks in the intake manifold and associated hoses. Fix any leaks found.
- 3Using a scan tool, monitor the live data for intake manifold pressure. Verify readings at idle and during acceleration.
- 4If pressure readings are consistently high (above 80 kPa), replace the intake manifold pressure sensor.
- 5If a leak is found or the sensor replacement doesn't solve the issue, more thorough inspection of the intake system and turbo characteristics is needed.
Common causes
- Faulty intake pressure sensor
- Leaking intake manifold
- Blocked intake system
- Turbocharger overboosting
- Wiring issues with the sensor
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not a major safety issue, but drivability can be affected, and it should be fixed soon.
Will this code come back even after I fix it?
If the underlying issue is resolved, such as fixing leaks or replacing the sensor, it shouldn't come back.
Why do I see this code along with SPN 672?
SPN 672 usually indicates a related issue with the turbocharger or boost control system, which can affect intake manifold pressure.
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