Not shifting

Tiny
19TRAVIS74
  • MEMBER
  • 2002 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
I recently changed fluid, filter, and seal. After doing so, now the truck will not shift. I am having to shift it manually from 2nd to drive. Is there a speed sensor in the transmission? When I was changing everything, I found a small part but the speed sensors I've found online do not look like the one I found.
Monday, August 10th, 2009 AT 4:10 PM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

Please upload a picture of the part that you found. This can help us determine what might be the issue.

It is possible to have a disconnected shift solenoid, or something got bumped in the valve body.

Take a look at this guide, it covers the typical reasons:

https://www.2carpros.com/articles/automatic-transmission-problems

You might have to remove the pan to verify everything is connected on the shift solenoid. You could have a disconnected wire.

I have attached diagrams for your reference.

Please let me know if you have any questions.
Thank you.
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Thursday, November 18th, 2021 AT 10:11 AM

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