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2003 GMC Sierra 4WD service light on

Tiny
JUDAS49
  • MEMBER
  • 2003 GMC SIERRA
  • 213,000 MILES
My truck has auto 4wd with neutral. 4wd service light on, no codes showing, I have replaced the switch on the dash, the encoder ring, and the 4wd shift solenoid on the front diff Also tried remainving the fuse for the Control Module for thirty seconds to wake up the Module and it didn't work. Trying to figure out whatwto look at next, maybe the Transfer Case Control Module?
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Saturday, August 3rd, 2013 AT 8:52 AM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It cold be but have it scanned by apro scanner he can turn the 4wd on andoff to figure out what is wrong. Could be encoder motor on tcase
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Saturday, August 3rd, 2013 AT 9:13 AM
Tiny
JUDAS49
  • MEMBER
  • 2 POSTS
Is there a different code reader they use other than OBDII? Sounds good though, dont wnat to throw more money at it without knowing more. Thanks.
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Saturday, August 3rd, 2013 AT 11:33 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
The ones at auto parts store a re just basic readers they can only read the code and erase it with some freeze frame capability the pro ones can turn stuff off and on to do further checkes like modules etc.
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Saturday, August 3rd, 2013 AT 2:44 PM

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