Manifold Absolute Pressure/Barometric Pressure Circuit Low Input
This code indicates that the MAP sensor is reading a voltage lower than expected.
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 Manifold Absolute Pressure (MAP) sensor measures the pressure in the intake manifold. It outputs a voltage that tells the computer how much air is in the engine. If the voltage is too low (usually below 0.2 volts), the engine might not get the right fuel-air mix, leading to performance issues.
What the computer is actually seeing
The engine control unit (ECU) expects the MAP sensor voltage to be within a certain range, typically between 0.5V and 4.5V depending on engine conditions. If it sees a voltage drop below 0.2V, it triggers the P0107 code.
What a healthy reading looks like
MAP sensor voltage should be between 0.5V and 4.5V; at sea level, it should be approximately 1.5V at idle and increase with throttle.
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 condition of the wiring and connectors going to the MAP sensor. Look for frays or corrosion. If damaged, repair or replace.
- 22. With the engine running, measure the voltage at the MAP sensor connector. Confirm it’s within expected values (0.5V to 4.5V). If it's below 0.2V, further check is needed.
- 33. Inspect for vacuum leaks around the intake manifold. A vacuum leak can cause incorrect MAP readings. Use a smoke machine if necessary.
- 44. If wiring and vacuum are fine, consider testing or replacing the MAP sensor itself. Confirm it outputs the correct voltage when the engine is at different RPMs.
Common causes
- Faulty MAP sensor
- Wiring issue or damaged connector
- Vacuum leak in the intake manifold
- Blocked or restricted intake air paths
- ECU issue
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's usually drivable, but you might experience reduced engine performance, misfires, or poor fuel efficiency.
Will this code come back after clearing it?
If the underlying issue isn't fixed, the code is likely to return after a short drive.
Why does this code appear with other codes?
Codes like P0106 or P0108 indicate similar MAP sensor issues, so they often show up together when there's a problem in the sensor circuit.
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