2001 GMC Sierra CODE PO101

P0101 Mass or Volume Air Flow Circuit Range/Performance Problem



Need to inspect your Mass Airflow (MAF) sensor. Suspect if may be faulty. This will usually cause poor power, poor idle and/or poor fuel mileage.



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thanks but the truck has a new m.a.f. sensor and map sensor

Try unplugging it and see if it makes the vehicle run better. If it does then there is still a problem with it somewhere. Either wiring or something is dirty and not letting the sensor do its job correctly.