Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction
There's a problem with the MAP or BARO sensor signal.
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 vehicle's computer relies on the MAP sensor to measure how much air is entering the engine; if it’s not reading correctly, it can lead to issues with fuel mixture and engine performance.
What the computer is actually seeing
The computer monitors the voltage output from the MAP sensor, which should be a steady 1 to 5 volts, depending on pressure. A reading outside this range causes the code to trigger.
What a healthy reading looks like
Normal MAP sensor voltage should range from 1V (at low manifold pressure) to about 4.5V (at high manifold pressure).
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.
- 1Inspect the MAP sensor connector and wiring for damage or corrosion.
- 2Check if the MAP sensor has proper voltage by back-probing the connector with the engine on; expect 1-5V while monitoring.
- 3Verify if the engine is getting sufficient vacuum at the MAP sensor; a vacuum leak can cause false readings.
- 4If the signal voltage is outside the expected range, replace the MAP sensor and retest.
- 5Clear the code and run the vehicle to see if the fault returns.
Common causes
- Faulty MAP sensor
- Wiring issues (shorts or open circuits)
- Bad connector at MAP sensor
- Vacuum leaks affecting sensor readings
- Faulty PCM (rare)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable but can result in poor fuel economy and performance; fix soon.
Will this code come back?
If there’s an underlying issue like a vacuum leak or bad sensor, yes, it will likely come back.
Why does this code pair with others?
Related codes indicate issues with pressure readings; they often come up when there's a common cause like a faulty sensor.
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