Question about 2001 GMC Yukon XL
Posted by Anonymous on
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Posted on Jan 02, 2017
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
ghoing found what you need:
Posted on Jun 13, 2009
MAF sensor usually won't prevent an engine from starting but would cause erratic idling after the engine is running. The problem is more likely fuel related (dirty fuel filter, dirty fuel injectors, failing fuel pump)
Posted on Jul 29, 2009
Yes,but they seldom fail
I would look a lot of places before that
If it is unplugged it won't start,if you have ducting
or air filter cover loose, it won't be able to adjust for
You can not test it yourself
You need a scanner or back probe it with a scope etc,
who has that knowledge
Do you have any check lights or codes?
Need more vehicle history & current issues leading up to
the no start!
Posted on Dec 03, 2010
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