I purchased the truck a few months ago it has been sitting to cold do do any work outside. Any way it also was sitting for a year when I purchased. It will start and move but only in second gear. I was told the 2500 series had the 4l80e transmission but not sure. Also the 502 motoe was installed a couple years ago. What possible problems could it be. Thanks
Yes the 2005 GMC Sierra 2500HD (with or without 4wd) came with a 4L80E transmission. If the truck moved and drove fine before you stored it. Your repair may be minor but you will need to inspect some components. You need to check as much wiring as you can. Look for a nest. When vehicles sit for a while animals (mice) can move in and wreak it. The problem is in the valve body. The shift solenoid (1-2) is either jammed, defective, has defective wiring going to it, or the PCM is not working correctly. Is the engine light on during this failure? If so, has anyone retreived the codes? Please write back if you have more questions but be detailed, as best as you can, good luck.
SOURCE: 2001 Yukon XL SLT 4 speed Auto Transmission shift problem!
Sam,
I would start with a transmission fliud and filter service.
I would then have the trasnmission checked out by a transmission shop. The transmission most of the time has the direct drum band is starting to go. The shops can rebuild it no problem, This is a very common failure wiith the trasnmission.
Good Luck
Testimonial: "Thanks alot richtko94'! I'll try that!"
SOURCE: 1996 gmc suburban transmission shift problem
96 gm trucks had a proble with third gear burning out because of a ground issue from pcm..there was a bulletin for adding a new ground for third gear control circuit...aftermarket trans shops do not remember this problem and it is often overlooked..take to local dealership and you should be able to get problem resolved
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