Intake Manifold Absolute Pressure (MAP) Sensor Performance Problem
The MAP sensor is reporting an out-of-range reading.
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 MAP sensor checks the pressure in the intake manifold to help the engine computer decide how much fuel to inject. If it measures too high or too low, the engine might run poorly or not at all.
What the computer is actually seeing
The engine control module (ECM) looks at the MAP sensor readings, which should typically be between 0.5 and 4.5 volts. If the voltage goes below 0.2V or above 4.8V, it triggers this fault.
What a healthy reading looks like
MAP sensor voltage should be between 0.5V (at idle) and 4.5V (at wide open throttle), corresponding to manifold pressures from 20 inHg to 30 inHg (approx. 0.68 to 1 psi).
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 of the MAP sensor for damage or corrosion.
- 2Ensure the intake system is free of vacuum leaks and that all hoses are connected properly.
- 3Test the MAP sensor output with a multimeter; expect 0.5V to 4.5V based on engine load.
- 4If the readings are out of expected range, replace the MAP sensor and retest.
- 5If still faulty, check for ECM issues or consult the service manual for further tests.
Common causes
- Faulty MAP sensor
- Wiring issues or connector problems
- Vacuum leaks in the intake system
- Clogged air filter or intake passages
- Faulty ECM
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not ideal. While the engine may still run, performance can be affected, so fix it soon.
Will this code come back after clearing it?
If the underlying issue isn't fixed, it likely will return.
Why does this code appear with others?
Codes often relate to the same system. Look for patterns in symptoms to diagnose effectively.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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