Speedometer issue, speed sensor?

Tiny
BAMCDON
  • MEMBER
  • 2005 CHEVROLET MONTE CARLO
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 100,317 MILES
About 3 weeks ago my speedometer looks as if I am going 120 miles an hour at a stopping position. As I slow down it goes backward 90-80-70. I just saw a spot of red under the car, car is perfoming the same except for the speedometer. Transmission? Cable? Averager cost of repair
Monday, January 25th, 2010 AT 10:20 AM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

If the car is operating as usual, it sounds like the speed sensor might be faulty, or it could have gotten loose.
There is a clip that holds the sensor in place and if for some reason the clip falls off the sensor will get loose.
Have you looked to see where is the leak coming from?
It could be from where the speed output sensor goes into the transmission.
Is the check engine light on? Any codes?

https://youtu.be/ahK_eucFi-k

I have attached the location for the speed sensor as well as replacement procedure.

Please let me know if you have any questions.

Thank you.
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Friday, July 16th, 2021 AT 9:41 AM

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