2004 HUMMER H2 4 WHEEL DRIVE WON'T LOCK IN

  • Tiny
  • fcsmilek
  • 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?

Thursday, December 18th, 2008 AT 7:12 PM

1 Answer

  • Tiny
  • brian 1
  • Expert
  • 1,071 posts

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

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Thursday, December 18th, 2008 AT 7:39 PM

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