Question about GMC Sierra

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2008 GMC SIERRA 1500 4.8l v8- My truck is strating off in 3rd gear. We were told it is skipping second gear, it is drinking alot of extra gas! I was told it could be the Transmission Control Module, Solenoid, or just needs to be flushed. Could someone help! I dont know what parts to order.

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  • GMC Master
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You have engine,transmission codes retrieve to know what is the real problem
because when PCM see a problem code is store and module is in safe mode. example; no first gear, no tcc and so on depends on what is the code

Posted on Oct 22, 2013

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Posted on Jan 02, 2017

  • 232 Answers

SOURCE: transmission problem with 2nd gear (loss of power, skips)

Go to this link.

Posted on May 11, 2009

  • 1 Answer

SOURCE: While driving on the freeway my automatic

My 2004 does the same thing im about to put a new trans in it because the trans shop said 3rd and 4th cluthes were out<!-- from fixya rte -->

Posted on Aug 14, 2010

frankgilbert
  • 613 Answers

SOURCE: second gear will not shift have to drive in 3rd to

Go to online site of autozone, oreillys...etc and you may have to register but they have free online step by step manuals.

Posted on Nov 02, 2010

  • 14585 Answers

SOURCE: I have a 1991 GMC Sierra 1500 with a 5L V-8. The

My truck had a shift problem from2nd to 3rd. I was ready to buy a solenoid package for it. ( which is what you have to buy, you can't get the solenoids by themselves, several hundred dollars) Someone recommended tranX to me. I put it in and within three days the transmission quit slipping, it's been over two years now and it hasn't missed a lick. It was a ten dollar fix, compared to $300.00 that the package was going to cost. not including any labor to install

Posted on Nov 28, 2010

Transdoc
  • 829 Answers

SOURCE: 1994 GMC 1500 Sierra has to rev up 1st gear and

If reverse is ok then you have a bad shift solenoid b.There are two solenoids on the back of the valve body that are identical,it will be the one on the pasenger side.GM calls them the 1-2 and 2-3 shift solenoid but this is deceptive because it takes a combination of them being on or off to achieve every gear.Pull the pan, disconnect solenoids and check resistance across them with a volt meter.I think you are looking for less than 20 ohms but the bad one will be off the chart.Bad transmission controllers are very rare in a GM vehicle.I bet if you have codes pulled you will find a shift solenoid code.Good luck!

Posted on Feb 21, 2011

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I have a 94 gmc sierra with 350 that has problem shifting to 2nd


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