what was the code #? had the same problem in my 2000 2500 and 2004 avalanche and both times it was the encoder in the motor. it would flash service 4x4 then go away. when u 1st start the truck it would be in 4x4 low or something except 2wd. 1 day my wife the avalanche and the transfer put it self in nutral and started to roll away
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