Transmission not shifting?

200,000 MILES • 5.7L • AUTOMATIC
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TBOAT13
  • MEMBER
  • 16 POSTS
Transmission pulls fine but won't shift to next higher gear after takeoff. Also shifter position indicator lights flash.
Oct 15, 2026 at 7:51 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,682 POSTS
We need to run the codes first, here is a video to help you.

https://www.youtube.com/watch?v=LBCpCWEFnTg

Please let me know what codes you find.
Oct 18, 2026 at 7:27 AM
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