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Service 4WD light (code C0550)

Tiny
UMPIRE
  • MEMBER
  • CHEVROLET BLAZER
My 1999 Chevy Blazer with 121,000 miles and 4.3L has the Service 4WD light on. The blazer will not shift into any mode of 4 wheel drive. No lights appear on the switch. However the lights all come on ocassionaly or the correct light will come on. A friend (mechanic) with a scanner got a code of C0550. What is this?
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Tuesday, October 2nd, 2007 AT 8:05 PM

1 Reply

Tiny
DENNYP
  • MECHANIC
  • 1,823 POSTS
That code means if you have good power and ground to the transfer case module, the module is no good.
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Wednesday, October 3rd, 2007 AT 9:55 PM

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