Powertrain, generic · Fuel and air metering

P0107 Manifold Absolute Pressure/Barometric Pressure Sensor Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

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.

Likely causes

Connector unplugged or corroded, signal or reference wire open
Signal wire shorted to ground (chafing)
5 V reference shorted by another faulty sensor on the same circuit
MAP sensor failed internally
Engine control module faulty

Symptoms

  • 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

Repair estimate

DifficultyEasyDIY possible
Parts and labour€20–200
Time0.3–1 h

Typical range across vehicles; the real cost depends on what the testing finds.

What to check first

  1. Check 5 V reference at the sensor
  2. Inspect the connector
  3. Wiggle-test the harness

Parts involved

manifold absolute pressure sensorsensor wiringsensor reference voltage

Related codes

P0105P0106P0108P0109P0236

References: law.cornell.edu, gsi.ext.gm.com, gsi.ext.gm.com, fordservicecontent.com.