Transmission will not go into overdrive

Tiny
DHOMIER
  • MEMBER
  • 2012 CADILLAC SRX
  • 3.9L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 78,840 MILES
My car will not go into sixth gear (overdrive) when accelerating. I took it to a mechanic and they diagnosed it needed a new temperature gauge and anti-freeze. My husband is a retired Army mechanic so he completed these tasks. It is still staying in fifth gear when accelerating. The diagnostic did not show any transmission codes, what else could be the problem?
Sunday, March 10th, 2019 AT 10:08 AM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
Good afternoon,

It could be the clutches in the torque converter. Since there are no codes, it is mechanical, not electronic.

How long since the oil and filter in the transmission has been changed?

Roy
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Sunday, March 10th, 2019 AT 11:08 AM
Tiny
DHOMIER
  • MEMBER
  • 2 POSTS
It hasn’t been changed since we bought it from first owner three years ago. The report they gave us said first owner had it done, so it was done before 2015.
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Sunday, March 10th, 2019 AT 1:30 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
Start with that.

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

Roy
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Sunday, March 10th, 2019 AT 2:15 PM

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