P0107Manifold Absolute Pressure/Barometric Pressure Sensor Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- The manifold absolute pressure (MAP) sensor measures the pressure behind the throttle; on vehicles without a separate barometric sensor it also supplies the ambient pressure, read at key-on or wide-open throttle – hence 'MAP/BARO'. It is a three-wire sensor with 5 V reference, ground and signal. P0107 means the signal voltage is below its lower limit. 'Low' refers to the voltage, not to a real low pressure: typically the signal wire is grounded, the signal or 5 V reference is open, or the sensor has failed. A short on another sensor sharing the same reference can pull it down too, so GM often sees several codes at once. Documented limits: GM below 3.3 % of 5 V (about 0.17 V), GM/Saab 2.0T below 0.19 V for 4 s, Ford petrol below 0.19 V for 5 s, Ford diesel below 0.1 V. GM petrol needs two trips, GM diesel one. A modelled value replaces the reading.
- What you may notice
- Check engine light on
- Hard starting, rough idle, stalling possible
- Wrong mixture from substitute value, higher consumption
- Loss of power or limp mode on turbo and diesel engines
- Likely causes
- LikelyConnector unplugged or corroded, signal or reference wire open
- LikelySignal wire shorted to ground (chafing)
- Possible5 V reference shorted by another faulty sensor on the same circuit
- PossibleMAP sensor failed internally
- RareEngine control module faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €20 – €200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.