Four problems related to transfer case have been reported for the 2003 Chevrolet Avalanche. The most recently reported issues are listed below.
Service 4wd comes on and truck reverts to 2wd, dealer has reprogrammed a few times unable to correct. When traveling down icy roads with no notice.
A warning light stating "service 4wd now" appeared on my dash of my 2003. Chevrolet Avalanche. According to the owner's manaul, this indicates that there is a problem with the 4-wheel drive of my vehicle. Upon inspection at the local Chevrolet dealership, I was informed that there is a bulletin from gm stating not to do any repairs for this concern. My vehicle is now stuck in 2wd and gm does not know if or when they will be able to remedy this defect.
2003 Chevrolet Avalanche, driving down road service 4 wheel drive light comes on and vehicle is locked in all wheel drive, or 4 wheel drive. Light has come on 6 times, dealer has inspected several times, and cannot duplicate the problem. No correction has been made so far.
While traveling error code light for 4-wheel drive came on.