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Shifting problem

Tiny
DOUG MCCLUSKEY
  • MEMBER
  • 1995 PONTIAC GRAND PRIX
  • 3.1L
  • 6 CYL
  • AUTOMATIC
  • 181,231 MILES
When I drive my car it will not shift into overdrive. But after a few miles I can stop and shut it off, then restart and drive again and it will shift properly.
Saturday, November 18th, 2017 AT 7:03 PM

7 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,217 POSTS
1995 was the first year for the OBD 2 diagnostic system. With that in mind, has the check engine light ever come when this happens?
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Saturday, November 18th, 2017 AT 9:12 PM
Tiny
DOUG MCCLUSKEY
  • MEMBER
  • 10 POSTS
Sometimes it will. And sometimes not. I have had it plugged in but it has shown nothing.
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Sunday, November 19th, 2017 AT 2:47 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,217 POSTS
Do you have a scanner that will read transmission codes? Most inexpensive ones won't.
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Sunday, November 19th, 2017 AT 4:49 PM
Tiny
DOUG MCCLUSKEY
  • MEMBER
  • 10 POSTS
O'Reilly has tried but nothing.
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Sunday, November 19th, 2017 AT 5:01 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,217 POSTS
Usually, the parts stores only have scanners that will read engine codes. With that in mind, confirm with them that they had one that will.
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Sunday, November 19th, 2017 AT 6:07 PM
Tiny
DOUG MCCLUSKEY
  • MEMBER
  • 10 POSTS
Ok I will ask them. But in your opinion is this a possible chance of jyst a short somewere
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Sunday, November 19th, 2017 AT 6:10 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,913 POSTS
To me it sounds like you have ECM that is going out becasue when you reset the system it starts working again. Have you serviced the transmission lately?

Here is a guide to give you an idea of what you are in for when doing the job.

https://www.2carpros.com/articles/how-to-service-an-automatic-transmission

Also here is the location of the ECM I would try to get a used one and plug it in to see if this is the problem.

Please let us know what happens.

Cheers, Ken
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Wednesday, November 22nd, 2017 AT 11:22 AM

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