Mechanics

CHEVY 4 WHEEL DRIVE

2004 Chevrolet Avalanche

Drive Train Axles Bearings problem
2004 Chevy Avalanche V8 Four Wheel Drive Automatic 52112 miles

i had a problem recently during a snow storm I selected 4 H on the 4 wheels drive selector. It started blinking and said service 4 wheel drive system needs service on the message center.
it would not go into 4 wheel drive

I used a scan tool an no error codes were present.
i tried to select 4h with scaner connected and again no codes were present

im able to put the truck into 4 low.
any ideas.I dont go into 4 wheel drive much. Maybe 6 times a year. Of course this year we have 3 big snow storms and the 4 high fails.
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Gottwin
January 14, 2010.



You will need a scan tool that can retrive information from all modules, primarily the transfer case module. Transfer case position sensors and encoders are common culprits.

Tiny
Scotty Dee
Jan 26, 2010.