Engine Intake Manifold Pressure (IMAP) Sensor
The IMAP sensor value is out of range.
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What it means (plain English)
The Intake Manifold Pressure (IMAP) Sensor measures how much air is in the intake manifold. If it gives a reading that's too high or too low, it can mess with engine performance.
What the computer is actually seeing
The engine control module (ECM) monitors the IMAP sensor input. A value that’s too low or too high for more than 5 seconds will trigger this code, indicating a potential issue in air intake or sensor failure.
What a healthy reading looks like
The IMAP sensor should output 0-5 volts depending on the pressure in the intake manifold, typically around 1-4 volts under normal operating 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. Check the wiring and connector to the IMAP sensor for damage or corrosion. Repair if necessary. Decision: Is the wiring intact? Yes: go to step 2. No: repair wiring and retest.
- 22. Ensure the intake air filter is clean and not blocked. Replace if necessary. Decision: Is the air filter okay? Yes: go to step 3. No: replace air filter and retest.
- 33. Test the IMAP sensor's output voltage with a multimeter while cranking the engine. Expected voltage should be between 1-4 volts. Decision: Is the voltage within range? Yes: go to step 4. No: replace the IMAP sensor and retest.
- 44. Inspect the intake manifold for vacuum leaks or blockages. Use a smoke machine if available. Decision: Are there any leaks? Yes: repair leaks and retest. No: further diagnose ECM or other components.
Common causes
- Faulty IMAP sensor
- Vacuum leak in intake system
- Wiring or connector issues to IMAP sensor
- Blocked intake manifold or air filter
- ECM malfunction
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Moderate severity means you can drive but performance might be impacted, address the issue soon.
Will this code come back after a reset?
If there’s a persistent problem, the code will likely return after a few drive cycles.
Why does this code often pair with SPN 311 or SPN 312?
These codes relate to other intake pressure measurements, suggesting issues within the same air management system.
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