Transmission not going into reverse?

2002 GMC SIERRA
110,000 MILES • V8 • 2WD • AUTOMATIC
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MICKIEME
This truck has been meticulously maintained and has never had any issues except last year when we thought it ran out of gas but ended up being a fuse. It's been running perfectly, but I haven't driven it for a week and all of a sudden, it's not going into reverse. It feels like it's neutral and the R is blinking. We've never seen this before. It will drive forward but extremely sluggishly. Told a transmission fuse. Would you agree?
Jun 7, 2025 at 11:33 AM
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STRAILER
  • ✓ASE Certified Mechanic
  • 54,503 POSTS
  • ASE Certified Mechanic
This could be, but it sounds like a shift solenoid is stuck open or not working. We need to run the codes to help guide us to the problem. Here are instructions on how to do so. You can get a code scanner from Amazon.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Good scanner - https://amzn.to/3FstLYg

Here is a guide to help you test the fuses:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Test the fuses with the key on. Please let us know what happens.
Jun 8, 2025 at 12:07 PM
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