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Tiny
JKERT10
  • MEMBER
  • 2002 BUICK CENTURY
  • 3.0L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 68,000 MILES
The speedometer bounces up and down and when it goes down below 10 mph it causes the car to downshift. I replaced the vehicle speed sensor and had all the wires grounds checked I have $360.00 spent and it still does it. I have now been told it may be the Body Control Module can you help me at all here I am very frustrated but 2 reputable shop can figure it out.

Joe
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Thursday, July 24th, 2014 AT 7:07 PM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Might be a bad dash are there any codes? Check fuel pressure with a gauge autoparts rent it. Body control module has no effect on running of car it's the pcm
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Monday, March 22nd, 2021 AT 6:38 PM
Tiny
JKERT10
  • MEMBER
  • 2 POSTS
No it gives no codes and we drove around with it hooked to a meter and it didn't do it of course. I am not as concerned with the bouncing speedo but the shifting can't be good. All the other gages work correctly
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Monday, March 22nd, 2021 AT 6:38 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
A lot of times these shifting problems are at the connection of the trans or just before it the wiring breaks or gets water on it an d then screws up that may be the speedo problem as well.
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Monday, March 22nd, 2021 AT 6:38 PM

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