Question about 2003 GMC Yukon

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My 2002 gmc yukon slt wont switch out of auto fwd? It was working fine in 2 hi then i switched it to 4 lo the light on the 4 lo started blinking while it was still blinking i accidentally hit the auto button it switched to auto and wont switch back no matter what i try . ???

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You need to replace the lockup servo mounted in the front differential housing. the light will blink to indicate that the lockup servo is not engaging/disengaging. you can get the servo at a local parts place. It is very easy to replace and is easily accessible.

Posted on Mar 23, 2011

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