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PLEASE HELP ME

Tiny
TANYAK
  • MEMBER
  • GMC
I HAVE A 93 DEVILLE 139,000 MILES ON IT AND I HAVE BEEN HAVING SOME PROBLEMS. Whenever the service engine light is on (not the service vehical light) the car itels at 3000 RPMS and the spedometer stops working and it wont be in the right gear that it should be in, but once that light shuts off the car runs fine it itels fine and the spedometer works. I replaced the transmission and the TPS and its still having problem please help me!
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Tuesday, March 28th, 2006 AT 8:53 PM

4 Replies

Tiny
KENB79764
  • MECHANIC
  • 52 POSTS
Sounds like the vehicle speed sensor may be going bad. It will cause the computer to put the car into a limp mode.
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Wednesday, April 5th, 2006 AT 9:55 AM
Tiny
TANYAK
  • MEMBER
  • 3 POSTS
Is that going to cost a fortune, I just ran another self diagnostic on it and it ran a code for loss comunication from the ECM to the BCM
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Saturday, April 8th, 2006 AT 12:42 PM
Tiny
KENB79764
  • MECHANIC
  • 52 POSTS
The speed sensor is usually under forty dollars depending on the vehicle. It may be slightly more on your caddy. It is just an electronic sensor that mounts in the transmission. It is normally about an hour to install.
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Sunday, April 9th, 2006 AT 8:11 AM
Tiny
TANYAK
  • MEMBER
  • 3 POSTS
It wasnt the sensor but I put in a new ECM and that was the problem, thanks for your help. I appreciate it
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Friday, April 14th, 2006 AT 4:22 PM

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