Mechanics

4 WHEEL DRIVE WON'T LOCK IN

2004 Hummer H2

Transmission problem
2004 Hummer H2 V8 All Wheel Drive Automatic 130000 miles

When trying to engage into either high lock or low lock, a message appears " service 4wd" and the H2 Hummer just stays in the regular all wheel drive mode. This started happening last winter and is consistant in cold weather when in MT. When I am in Houston this rarely happens, it usually will engage in either high or low lock. Someone told me the electrical actuator needs to be replaced with a pneumatic actuator. Thoughts?
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Fcsmilek
December 18, 2008.



Have it scanned for trouble codes and post back, could be a number of things. Post the dtc and will help from there.

Brian 1
Dec 18, 2008.