Here is the definition of the code.
P0101 GMC Description
The Mass Air Flow (MAF
sensor is placed in the stream of intake air. It measures the intake
flow rate by measuring a part of the entire intake flow. It consists of a
hot film that is supplied with electric current from the Engine Control
The temperature of the hot film is controlled by the ECM
acertain amount. The heat generated by the hot film is reduced as the
intake air flows around it. The more air, the greater the heat loss.
Therefore, the ECM
must supply more electric current to maintain the temperature of the hot film as air flow increases. The ECM
detects the air flow by means of this current change.
Faulty mass air flow sensor
- Intake air leaks
- Dirty mass air flow sensor
- Dirty air filter
- Mass air flow sensor harness is open or shorted
- Mass air flow sensor electrical circuit poor connection
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