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OBD-II Trouble Shooting Got a code reader? Find out what your GM car's Check Engine light is trying to tell you (and then turn Check Engine light off).

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Old 09-24-2009, 05:17 PM   #1
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Default P0101



Mass Airflow (MAF) sensor measures amount of air entering
engine during a given time. PCM uses MAF sensor information for fuel
delivery calculations. MAF sensor readings during acceleration are
much higher than those during deceleration or idle.
PCM calculates what MAF sensor reading should be from sensor
under certain conditions using engine speed (RPM), throttle position,
and barometric pressure parameters. When these test conditions are
met, PCM will compare its calculated MAF value to actual value
received from sensor.


You will likely not notice any serious drivability problems.

The simplest thing to do is to reset the code and see if it comes back.
  • Check for faulty connections or damaged harness. Ensure
    harness is not routed too close to high-voltage wires, such as spark
    plug cables.
  • Check for plugged intake air duct or dirty air filter.
  • Check for vacuum leaks
  • Check for restriction in the exhaust system
  • Check for throttle plate sticking or excessive deposits on throttle
    plate or throttle bore.
  • Check for skewed or stuck Throttle Position (TP) sensor.
  • Faulty connection or high resistance in sensor ground
  • Replace MAF sensor
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