2004 GMC C2500

2004 GMC C2500
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TOBYDOG
  • MEMBER
  • 1 POST
Transmission problem
2004 GMC C2500 V8 Four Wheel Drive Automatic

4wd not working no lights work in 4wd switch code co327 new encoder motor installed still not working now has code c0327 and code c0379 tried new push button switch also thanks for any help
Aug 12, 2009 at 11:19 AM
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BRIAN 1
  • ✓Experienced Mechanic
  • 1,030 POSTS
check the tccm connector for water intrusion or corrosion.
Aug 13, 2009 at 10:41 AM
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