Transmission not shifting properly and AT light turns on

2008 MAZDA 3
165,896 MILES • 2.3L • 4 CYL • 2WD • AUTOMATIC
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RYU24
  • MEMBER
  • 1 POST
AT light comes on after third gear and it gets stuck on fourth gear and fifth gear never kicks in why?
Jul 6, 2022 at 2:34 AM
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STRAILER
  • ✓ASE Certified Mechanic
  • 54,832 POSTS
  • ASE Certified Mechanic
This sounds like you have an input shaft speed sensor that is not working correctly but to be sure we need to run the codes; this guide can help, and I have the sensor location in the diagrams below:

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

Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.

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Jul 6, 2022 at 7:58 PM
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