Question about 1999 GMC Jimmy

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Emmission codes, Mass air flow sensor

I am getting two codes
P0101 - AFS Range / Performance
P1870 - Not defined
I was told to replace the mass air flow sensor Will this correct this problem and is the second error related to the first? will they both clear?

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  • Anonymous Mar 17, 2014

    will at make check engine

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  • 104 Answers

The P0101 code is indeed a code indicating an issue with the MAF sensor. It could be something as simple as cleaning the sensor, or it could be faulty and in need of replacement.

Now, the P1870 code refers to the transmission, and a condition in which the PCM is detecting excessive slipping. That is to say it perceives the transmission slipping as it compares engine speed (RPM) and vehicle speed (MPH) and should a ratio be exceeded then the PCM will set code P1870. I would expect that you would notice a bit harsher shifting in response to this code, particularly on the 1-2 shift as the PCM will command higher fluid pressure to combat the slipping.

Now, it is possible that the an issue with the MAF would cause signals to the PCM to change significantly and to such an extent that the PCM would think something is off with the transmission, so I would start there, with the MAF sensor and see if that helps as it appears you were already thinking.

Posted on Jan 02, 2009

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