Transmission will not shift passed third gear?

1995 ISUZU TROOPER
150,000 MILES • 3.1L • V6 • 4WD • AUTOMATIC
Avatar
TOPH520
  • MEMBER
  • 1 POST
So, my vehicle has been giving me some transmission issues. In order to get the vehicle to move, I have to shift it into 1st and then work my way up the gears like it's a standard, but it's an automatic. An additional problem I've noticed is it won't shift out of third into overdrive. I've asked around and people seem to have a different answer as to why it's doing that. Would my transmission be bad, or would it be something as simple as a sensor?
Jun 8, 2023 at 7:18 PM
Advertisement
Avatar
STRAILER
  • CERTIFIED EXPERT
  • 53,854 POSTS
Yes, I have seen the output shaft speed sensor cause this problem, but we should run the codes first.

Here is a guide to help with the sensor location in the images below:

https://www.2carpros.com/articles/mitsubishi-trouble-code-definitions-and-retrieval-procedure-for-odb1-system

It could be the TCM as well. Also let's check the transmission fluid level.

https://www.2carpros.com/articles/how-to-check-and-add-transmission-fluid

Here are the shift solenoid locations so you can see how the system works. Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.






Jun 9, 2023 at 12:44 PM