Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance Problem
The manifold pressure reading is outside the expected range.
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What it means (plain English)
The engine computer checks the pressure in the intake manifold to determine how much air is getting in. If the pressure reading is way too high or too low compared to what's expected, it triggers this code.
What the computer is actually seeing
The vehicle's engine control module (ECM) compares the map sensor voltage reading against a predefined range. It typically expects voltages between 0.5 - 4.5 volts, correlating to manifold pressures from around 0 to about 105 kPa (15 psi).
What a healthy reading looks like
Manifold pressure should generally be around 20 inHg (about 68 kPa) at idle and increase with throttle opening. Voltage should be 0.5V at atmospheric pressure up to 4.5V at higher pressures.
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. Inspect the wiring and connector to the MAP sensor for damage or corrosion. Repair if necessary. Decision: Is wiring and connector good? Yes: Continue. No: Repair or replace wiring/connector and recheck.
- 22. Check for vacuum leaks around the intake manifold and vacuum lines. Use a smoke machine if available. Decision: Are there any leaks? Yes: Repair leaks and recheck. No: Continue.
- 33. Measure the voltage at the MAP sensor connector with the key on and engine off. Expected should be around 0.5V. Decision: Is the voltage within range? Yes: Continue. No: Replace the MAP sensor.
- 44. With the engine running, measure the MAP sensor output voltage at idle. It should be around 1.0-1.5V for a properly running engine. Decision: Is the voltage correct? Yes: Test drive and recheck for codes. No: Replace MAP sensor if faulty.
Common causes
- Faulty MAP sensor
- Vacuum leaks in intake system
- Wiring issues or bad connectors
- ECM software issues
- Exhaust leaks affecting sensor readings
Typical repair cost
$$-$$$ (typically $150-$300 based on parts and labor)
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but you may notice some performance issues. It's best to fix it soon.
Will the code clear itself?
It can clear if the issue is resolved, but if the problem persists, it will return.
Why does this code pair with other codes?
Often, multiple sensors are affected by similar issues, like vacuum leaks influencing both MAP and MAF sensors.
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