P0107 Code – Manifold Absolute Pressure/Barometric Pressure Circuit Low

Meaning:

The P0107 code is triggered when the voltage in the MAP sensor is too low
When the PCM has detected that the voltage in the MAP sensor is too low, P0107 happens

The PCM has detected that the voltage in the MAP sensor is less than .25 volts, which is too low to send a reliable signal.

Main Symptoms:

  • Check Engine Light comes on
  • Vehicle is hard to start
  • Poor fuel economy
  • Engine fails to idle
  • Engine produces black smoke (visible at tailpipe)
  • Engine cranks for long
  • Erratic acceleration

Possible Causes:

  • Faulty MAP sensor
  • Open or short in signal circuit, 5volt reference circuit or ground circuit
  • PCM is defective (least likely but not unlikely)

Diagnostic Steps:

  • Use an advanced scanner to pull engine codes
  • With that scanner, take the voltage of MAP sensor when engine is on and key is on. If it’s less than .5V turn the engine off, remove the MAP sensor and use a volt/ohm meter to check for 5 volts on the 5 volt reference circuit

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