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Car will not reverse or go over 30 MPH?

Tiny
RHAT
  • MEMBER
  • 1995 PONTIAC BONNEVILLE
  • 3.8L
  • 6 CYL
  • AUTOMATIC
  • 157,350 MILES
Car shifts into all gears fine when using the shifter, but when in reverse there's no power so car cannot reverse. When car is in drive overdrive two or one car will drive up to about 30 MPH before hitting high RPMs and refuses to shift.
Tuesday, June 13th, 2023 AT 4:18 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi,

Have you checked the transmission fluid level and condition? If you haven't, start by checking.

Here is a link that explains how this is done:

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

Remember, when checking the fluid level, the engine needs to be at operating temperature, the vehicle in park, and sitting on a level surface.

Let me know what you find.

Joe
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Tuesday, June 13th, 2023 AT 9:27 PM
Tiny
RHAT
  • MEMBER
  • 2 POSTS
Transmission fluid is fine the level is in the middle of the two arrows still a good color does not smell burnt.
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Wednesday, June 14th, 2023 AT 5:49 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi,

The next thing I would check is transmission line pressure. This requires connecting a transmission pressure gauge and inspecting the pressure under specific conditions.

If you look below, I attached the procedure. Take a look through it and let me know if it is something you are comfortable performing.

Let me know.

Joe

See pics below.
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Wednesday, June 14th, 2023 AT 9:54 PM

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