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SERVICE ENGINE SOON light

Tiny
PILOTBILL
  • MEMBER
  • 1991 CHEVROLET LUMINA
  • 280,000 MILES
I have a 1991 Chevrolet Lumina 3.1L V6. The car runs real good, but when I start slowing down from highway speeds (60+ MPH) the SERVICE ENGINE SOON light comes on once the speed drops below 48 MPH. Once the light comes on it will stay on until you shut the engine off. The code that I got from the ALDL CONNECTOR is CODE 12 (Diagnostic). I have not been able to get any other codes. What could the problem be and how would I fix it?
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Wednesday, January 25th, 2012 AT 6:59 PM

3 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
There is no code 12 so you could be having a problem with the computer itself or you may be reading it incorrectly. But I have seen a VSS cause this problem here is the location in the transmission final drive

Check out the diagrams (Below). Please let us know what happens.

Cheers
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Thursday, January 26th, 2012 AT 1:39 PM
Tiny
PILOTBILL
  • MEMBER
  • 78 POSTS
Well that was easy I got the sensor for $43.00 and installed it the problem is fixed thanks ! I love this site.
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Thursday, January 26th, 2012 AT 2:03 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
Good to hear, please use 2CarPros anytime we are here to help.

Cheers
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Thursday, January 26th, 2012 AT 2:08 PM

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