It would switch from 2 wheel drive to 4 wheel drive while driving, causing car to slow down dramatically. Transfer case actuator module bad on truck when called for warranty they stated it was a common failure. I felt it was a deadly and dangerous situation, depending on where you were driving when it happens, and should be looked into.

- Clark, NJ, USA

Vehicle switches into 4- wheel drive low intermittently with no user action taken.

- New Lenox, IL, USA

Transfer case has failed 3 times, and each time it was replaced by the dealer. It stayed in 4 high, and it just locked up, consumer had it replaced and it worked for a minute and failed again, it kept doing the same thing.

- Palma, OH, USA

The four wheel drive did not engage properly. The switch was disconnected by the dealer and the part would be replaced, once it arrived.

- Bluffton, IN, USA

Our 2001 Blazer 4WD failed to engage. We were traveling East on highway 36. It was snowing. I pressed the 4WD hi button and it continued to blink. We were on a narrow two lane highway and had no where to pull over. The 4 wheel drive failed to engage and the Blazer, within seconds sliped over the cliff. The front wheels did not lock in. We rolled down the cliff approximately 50 feet and hit a tree.

- Westwood, CA, USA

When the car in gear on a hill, it will roll down the hill and increase in speed. The car rolls so fast that you cannot safely make the transition from brake to accelerator without rolling severely, the manufacturer stated that this falls within specs, the 4 wheel drive service light is illuminated.

- Colorado Springs, CO, USA

When the car in gear on a hill, it will roll down the hill and increase in speed. The car rolls so fast that you cannot safely make the transition from brake to accelerator without rolling severely, the manufacturer stated that this falls within specs, the 4 wheel drive service light is illuminated.

- Colorado Springs, CO, USA