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Speedometer needle bouncing erratically until transmission slipping out of gear?

Tiny
WISTERDOO
  • MEMBER
  • 2003 CADILLAC DEVILLE
  • V8
  • 2WD
  • AUTOMATIC
  • 200,484 MILES
Jumping speedometer at random speeds. Any decrease in gas or even while in cruise control if there was a small incline and a slight decrease in speed transmission would slip out of gear. Would re-engage if revved.
Wednesday, April 12th, 2023 AT 11:18 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
I would check the transmission fluid and then run the codes to see what comes up.

These guides can help:

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

and

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

Please go over these guides and report back.
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Thursday, April 13th, 2023 AT 10:46 AM

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