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1999 Chevy Silverado 4-wheel Drive

Tiny
LNLINDSEY
  • MEMBER
  • 1999 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 138,000 MILES
What makes the"Service 4-wheel drive" light come on.

the above service light comes on periodically and appears to be related to cool/cold ambient temperature. The front diff. Has the correct oil level
Saturday, November 28th, 2009 AT 2:18 PM

2 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
It could be a sensor. What to do is take the truck to a nationally recognized parts store and have them scan the computer for codes. If the light has been on, the computer should have stored a trouble code which will help us identify the problem.

NOTE: Most nationally recognized parts stores will scan it for free. When they do it, ask them to tell you the code they recovered so I know what we are dealing with.
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Saturday, November 28th, 2009 AT 10:47 PM
Tiny
LNLINDSEY
  • MEMBER
  • 2 POSTS
The code that is set is B2725 when the Service 4-wheel drive message is displayed
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Thursday, December 31st, 2009 AT 1:01 PM

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