4x4 transfer case lights, U1000 quick fix - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > 4x4 Drivetrain

4x4 Drivetrain 4x4 Repairs & Problems

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Old 02-25-2009, 11:03 PM
dinkbassr dinkbassr is offline
Junior Member
2002 Chevy TrailBlazer LTZ
with silver trim 4.2L I6 4X4
Join Date: Jan 2009
Location: Lehigh Valley, PA
Posts: 33
4x4 transfer case lights, U1000 quick fix

During a recent snow storm here in SE Pa. I found that I no longer had electrical access to the 4x4 function switch. The lights had gone out. I had put the selector in A4WD and then 4HI and nothing happened. I contacted ON-STAR and their diagnostic check indicated there was an issue with the transmission having "lost communication" with the transfer case. The ON-STAR employee gave me a U1000 code number. After checking many threads related to similar issues I happenned to speak to another Chevy P/U owner who said he had similar problems. He suggested disconnecting the NEG battery terminal, then reconnecting power a few minutes later. So I took his suggestion and GUESS WHAT ? The power came back on to the lights and I now have a 4x4 vehicle again !!! I guess it was like re-booting a computer by turning it off then repowering.
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Old 02-25-2009, 11:09 PM
Lov2xlr8's Avatar
Lov2xlr8 Lov2xlr8 is offline
Junior Member
2006 Chevy TrailBlazer LT
two tone black/silver 5.3L V8 4X4
Join Date: Dec 2008
Location: Long Island
Posts: 81
Cars today have become too advanced for their own good, its like they are more electrical then mechanical. I hope your problem doesnt resurface, at least now you know how to take care of it at least. If it starts up again I would have to strongly recomend that you pull your engine and put in a Carburated Chevy big block motor with another transmission, that should stop all those pesky electrical gremlins.
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