Question about 2006 GMC Sierra 1500HD

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I have a 2006 GMC Sierra 1500HD that everytime go to start is wants to start but doesn't. Have changed the fuel pump and had a code of P0101 (Mass Air Flow). Changed the mass air flow sensor, still having the same issue. Any suggesssions?

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5 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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SOURCE: mass air sensor and intake air temperature sensor

They are not the same thing but the air temp sensor is made into the mass air sensor

Posted on Nov 22, 2008

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StormStrikes
  • 104 Answers

SOURCE: Emmission codes, Mass air flow sensor

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

coop442000
  • 187 Answers

SOURCE: 1999 GMC Savana - changed

Hi, I see you have changed a bunch of items, but do we know if the engine is getting fuel pressure? (55 psi at test port), or getting good spark? Could the spark plugs be fouled?I think before you replace too many items, you should start with basics. Good luck, Thanks...

Posted on Sep 22, 2010

  • 396 Answers

SOURCE: 1998 GMC Sierra 2500 5.7L

starting definately has a lot to do with the crank/cam position sensors, but it wouldnt have nothing to do with hot or cold weather, oxygen sensor will make the vehicle run too rich if its out, you will smell fuel very strong out the exhaust, that could make it run sluggish also, and usually if the mass air flow sensor goes out the vehicle wont start at all...

Posted on Nov 27, 2010

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starting definately has a lot to do with the crank/cam position sensors, but it wouldnt have nothing to do with hot or cold weather, oxygen sensor will make the vehicle run too rich if its out, you will smell fuel very strong out the exhaust, that could make it run sluggish also, and usually if the mass air flow sensor goes out the vehicle wont start at all...

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