Engine Intake Manifold Pressure Sensor Out of Range
The engine intake manifold pressure sensor is reading above or below acceptable limits.
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What it means (plain English)
The sensor that measures how much air is in the engine's intake is faulty or seeing extreme readings, which can affect engine performance.
What the computer is actually seeing
The ECM sees readings from the intake manifold pressure sensor falling outside a predefined range, typically above 5 volts or below 0.5 volts, indicating a fault.
What a healthy reading looks like
The intake manifold pressure should be between 0.5 to 4.5 volts at idle, corresponding to pressure readings of approximately 0 to 30 inHg. Erratic or extreme voltage signals indicate a problem.
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 intake manifold pressure sensor for damage or corrosion. Repair as necessary. Decision: If wiring is fine, proceed to next step. If damaged, repair and retest.
- 22. Test the voltage output from the intake manifold pressure sensor with a digital multimeter. At idle, it should read between 0.5 and 4.5 volts. Decision: If the voltage is out of this range, replace the sensor. If within range, check the intake manifold for leaks.
- 33. Inspect the intake manifold for vacuum leaks or obstruction. Use a smoke machine to find leaks. Decision: If leaks are found, repair and retest. If no leaks, suspect ECM issue.
Common causes
- Faulty intake manifold pressure sensor
- Wiring issues (shorts/open circuits)
- Intake manifold leak
- ECM software issue
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best to fix this soon, as it can affect engine performance and efficiency.
Will this code come back after clearing?
It may return if the issue isn't resolved, especially if the sensor or wiring is still faulty.
Does this code relate to other performance issues?
Yes, it can cause rough idling, loss of power, and increased emissions if not addressed.
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