Flashing 4wd switch lights - 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 5.3L V8 Engine and Drivetrain > 4x4 Drivetrain

4x4 Drivetrain 4x4 Repairs & Problems

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  #1  
Old 02-06-2010, 08:38 PM
kip45223 kip45223 is offline
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2005 Chevy TrailBlazer LS
White 4.2L I6 4X4
Join Date: Jan 2010
Location: Hamilton, OH
Posts: 7
Flashing 4wd switch lights

Last year when it got cold my 05 Traillazer LS started having issues. When it got cold and snowy, the 4wd switch lights would all flash when the car was started and then go to the 2hi or whatever was selected and that light would flash then after 15-20 flashes all lights go out and have no ability to use the 4wd. The weather broke in 2 days and all was good until it got cold and snowy this month and it started again. I finally broke down and took to dealer. Was diagnosed as the actuator on the front axle.......replaced. this did not fix it. They replaced a spider gear in the front axle area that the actuator engages, and thought was fixed. But was inside the warm shop. They parked it outside overnight and you guessed it, same issue. Took it back inside and can't find what is problem. Said they checked the TCCM (?) but it was not that. I feel this is electrical issue as the trans/4wd works great in warm times......ANY IDEAS FOR ME TO RUN BY THE DEALER? They have had it for a week so far. I feel they are making honest effort but its a mystery...
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  #2  
Old 02-06-2010, 10:08 PM
the roadie's Avatar
the roadie the roadie is offline
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2004 GMC Envoy SLT "Roadiemobile"
Extreme Offroad Pewter 4.2L I6 4X4
Join Date: Apr 2005
Posts: 26,181
It should be obvious to a trained and experienced mechanic, but they need to drag their Tech II tool out to the truck while it's cold and misbehaving. If it isn't the TCCM (transfer case control module) which is behind the dash near the driver's left knee, then it's the wiring or the switch. The Tech II tool can command the TCCM to exercise the front axle actuator PLUS the encoder motor that changes the modes on the transfer case itself.

If the Service 4WD light never comes on, then that rules out a communication issue from the PCM to the TCCM.

Are you paying them to go through this guessing game, or do you have an extended warranty? They should have access to better tech support engineers at GM than we are at trailvoy, you'd think.
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  #3  
Old 02-07-2010, 02:20 PM
kip45223 kip45223 is offline
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2005 Chevy TrailBlazer LS
White 4.2L I6 4X4
Join Date: Jan 2010
Location: Hamilton, OH
Posts: 7
Paid 500 bucks for initial repair, that didnt do it. They havent said anything yet. Gave me a loaner 03 TB til they figure it out. Never a service 4wd light
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  #4  
Old 02-08-2010, 09:27 PM
kip45223 kip45223 is offline
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2005 Chevy TrailBlazer LS
White 4.2L I6 4X4
Join Date: Jan 2010
Location: Hamilton, OH
Posts: 7
The dealer finally listened a bit to me. They let it sit outside and checked the TB after sitting in cold, voila, encoder motor sensor bad. Works great now............. SO Far...... no extra charge for troubleshooting a whole week but still got 475 bucks but I got my car back.....I'll take it!
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