Transmission shift from high gear

2003 DODGE NEON
168,000 MILES • 2.0L • 4 CYL • FWD • AUTOMATIC
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TDS5888
  • MEMBER
  • 7 POSTS
Transmission will shift from overdrive to third gear automatically for a brief moment before dropping back to overdrive. It does this about every ten seconds or so. No vacuum leaks detected, fluid level good, shifts good until about fifty mph when this happens.
Any help is appreciated.
Oct 15, 2017 at 7:01 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,612 POSTS
It sounds like you have a shaft speed sensor that is going out in the transmission is the check engine light on? These sensors may or may not trigger a check engine light. Lets runs the codes so it will give us a clue whats going on.

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

If the transmission speed sensor codes comes up here is a video of one being replaced so you can get an idea of what to do.

https://youtu.be/f3bETtCIdxM

Please let us know what happens.

Cheers, Ken
Feb 24, 2021 at 6:18 AM
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