The vehicle failed to engage into 4-wheel drive. The consumer took the vehicle to the dealer. The mechanic will be doing a diagnostic test to determine the problem.

- West Fargo, ND, USA

On a number of occasions, while driving in 4WD hi, vehicle automatically shifts into 2wd or attempts to shift into 4WD lo. On two occasions, while driving in 2wd it shifted into 4WD. Dealership could not duplicate problem, so they would not fix or replace any parts. Similar account to several other owners.

- Hiram, OH, USA

4-wheel drive failed causing vehicle to go from 4-wheel drive to 2-wheel drive without changing the selector. Dealership is unable to duplicate the problem, so they can't fix it.

- Plainfield, IL, USA

The brake light went out multiple times without warning. The dealer was aware of the problem. There were no incidents to report at this time. The consumer stated when the vehicle was warm, the was a noise in the front end, the dealer replaced the axle seal and bearing, the O2 oxygen sensor was replaced. The 4-wheel drive was inoperative.

- Maysville, KY, USA

Electronic exterior rearview mirrors and power seat engage and operate by themselves. Dealership cannot fix the problem. The memory for the mirrors and seat would not keep their position. When the consumer entered or exited the vehicle the systems would reset to a new position. Occasionally they moved while the vehicle was in motion. The dealer has replaced many components but the problem still exist. The check engine light illuminated. The dealer replaced the oxygen sensor. The A/C control mode button became stuck and was noisy. The dealer replaced the A/C module head. The left windshield wiper chattered and skipped. The dealer replaced the wiper insert. The 4WD switch fluctuated between 4wh and A4wh. The dealer inspected the vehicle and replaced the transfer case select switch.

- Centerville, OH, USA

At medium to high speeds transfer case engages without warning.

- Boynton Beach, FL, USA

Problems with 2002 Chevrolet Trailblazer. The headlamps went out while driving. The 4WD light appeared on the dash board, while driving, the gear switched to 4WD which caused the vehicle to jerk.. also on 2 occasions the consumer was unable to shift the gear from park to drive.

- Winston-Salem, NC, USA

My service 4WD light has been a problem since January 2003. My 2002 Trailblazer has been in the shop for almost all of July. Chevy has refused to repurchase my vehicle stating that they are going to "fix" it under the warranty. It goes without saying that I am fighting this. Additionally, upon my return from a three week vacation in March, I found my Trailblazer completely dead. Chevy has not been able to to identify the problem.

- Ft. Washington, MD, USA

Service 4WD light comes on, vehicle will automatically go into four wheel drive without the switch being turned. This causes the vehicle to jerk and it is difficult to steer at times.

- Winston-Salem, NC, USA

While driving, the four wheel drive kicked in which caused the rear end of the vehicle to lock up.

- Highland Mills, NY, USA

Vehicle engaging into 4 hi, 4 low, and a 4 wheel drive spontaneously. While vehicle is in park and in 4 wheel drive, it has a whinning sound and will lunge when 4 wheel drive is turned off.

- Otterville, MO, USA

While driving the vehicle at a speed of approximately 65-70 mph, I felt a surge as if the transmission was shifting. As this was happening I noticed the light next to the four-wheel switch selector knob was blinking above the automatic 4hi position. This has happened on occasion quite frequently. My wife who normally drives this vehicle says it happens several times during a typical 60-mile trip. This same thing happened a week after we starting leasing this vehicle back in April of 2002. I told the dealership about it and they said they couldn't find anything wrong. They said it's hard to find something wrong with it when it's not actually happening in front of them. It always tends to happen in the speed range of 50-70 mph. This issue has me concerned, especially while driving on snow, ice, or wet surfaces. I'm afraid it could jerk enough to throw us off the road. I've now realized, through the NHTSA web site, that many Trailblazer owners/operators have had similar problems and GM has done nothing to remedy the problem. I've always purchased GM since my father is a retired GM employee, but I'm now considering buying outside of the GM family. What good is the GM employee incentive/discount, when your life is at risk" apparently to GM, the cost of life is nothing compared to the cost of a recall. I'm considering getting out of the lease, no matter the cost, due to the lemon of a vehicle we now have. How many people will be injured and or possibly killed before GM decides to bite the bullet and recall their bread-winning vehicle" today (3-17-03) while in for normal service, I was told that the dealer reset the control module, which might fix the problem. I asked them about changing the switch and they said they have done this on some vehicles but prefer to start with resetting the module. Only time will tell. I hope the forecast is for dry weather!

- Delta, OH, USA

The 4 wheel drive did not perform as designed, which resulted in an accident.

- Rochester Hills, MI, USA

On 11/02 I had my vehicle at the dealer for service & it was brought up that the 4WD was turning on & off randomly. The service person mentioned that they have seen a handful of these & the computer in the vehicle was "asleep" however, they advised they couldn't check the problem because it was in working order at the time I had it in. They could only check the problem if it wasn't working. The last week of 1/03, I was traveling at highway speeds in 2wd. The vehicle automatically shifted itself into 4WD high, made a very loud sound & the lights on the dash changed from 4WD high to AWD, & 4WD low. When I arrived home, all the lights on the dash for 4WD were out & have not come back on. The vehicle was turned off. When the vehicle was turned back on the following day, it was in 2wd & would not engage into AWD or 4WD high or low. I contacted my dealer who set up an appointment to bring the vehicle in on 2/5/03 to have the 4WD checked out. On 2/4/03 I hit a patch of snow & ice with my rear tires. I was traveling approximately 40 mph on a 55 mph road. Due to the vehicle only being in 2wd & the AWD & 4WD not working, the front wheels of the vehicle had no power & the vehicle went out of control & ended up in a ditch on the side of the road causing over $4000 in damage. Minor bruising injury to myself when my knees slammed into the dash. Body damage has been repaired & the service dept has confirmed that the computer was not working at the time of the accident in order for the 4WD to turn on. The computer has since been "reset" & the vehicle returned to me on 2/27/03. Again on 3/1/03 & 3/3/03, the vehicle was in 2wd traveling at highway speeds & randomly turned from 2wd to AWD & 4WD. On 3/10/03, I advised the dealer again of the problem & the manager is going to speak w/the service dept to find out if there have been any other complaints of this nature. Again, the dealer said they couldn't do anything now for me as the vehicle is working at this time.

- Delanson, NY, USA

Update of complaint 10003216. Grinding noise in transfer case recurred while driving on freeway at 65-70 mph, with 4WD mode switch lights jumping back and forth between 2wd and 4WD. Stopped off freeway to call dealer, car would not move, towed to dealer. Told that the transfer case failed.

- Meadow Vista, CA, USA

Power transfer case 4 wd, again today 2/5/03 my Chevy Trailblazers 4WD locked up with knob in 2wd and the lights are on both 4wh-4wl stopped us abruptly skidding and throwing us forward, I had this car in the shop 1/31/03 for the same problem, and they told me they could find nothing wrong with it. I told the dealer and gmac that I donot want the car back this is the 4th time this has happened and me and my familly are very affraid when driving this car that it is dangerous and could injure us. Maybe it will take someone getting hurt or killed before they will by back this car. I am in fear at all times when I drive it but I have no other vehicle and cqant afford to buy another with this payment. Gmac please help

- Soith San Francisco, CA, USA

The 4WD system switches between 2hi, A4wd, and 4hi modes on its own while the vehicle is in motion, the indicator lights on the rotary selector blink, there is a slight jerk felt in the drive train as the transfer case shifts, dealer can not remedy the problem. Itit has been in for service 4 time for the same problem

- Battleground, IN, USA

While driving at freeway speed, 65-70 mph, a grinding, ratcheting sound was heard from the drivetrain and the lights on the transfer case switch moved back and forth from 2wd to 4hi and 4low. After the vehicle was towed to the dealer, they first completed the recall #01065 to reprogram the transfer case. When they road tested the car they could not duplicate the earlier complaint of grinding metal. The service advisor indicated that the recall probably corrected the problem. My question is, what did all that metal grinding noise do to the longevity of the transfer case, and what if it fails after the 3 year, 36 month warranty?

- Meadow Vista, CA, USA

On four prior occassions, my 2002 Chevrolet Trailblazer has automatically engaged into 4 wheel drive from two wheel drive. The switch indicator remained in "2 wheel hi" but the flashing led was also indicated on the "4 wheel hi." This latest incident, which occured on a snow covered road while I was making a left hand turn, caused me to temporarily lose control of my vehicle without damage. The other three incidents' also occured while I was driving the vehicle.

- Ravenna, OH, USA

Vehicle in for service 6 times. Vehicle purchased in Oct 01. First instance was Jan 2002. Was driving the vehicle at approx 65-70 mph in A4wd. Vehicle shifted down into 4lo causing loss of power & control. Service 4WD light came on. Vehicle would not come out of 4WD until it had been parked & shut off. Mode switch on dash was replaced following incident. One week later, vehicle shifted into 4hi while driving in 2hi. Mode switch was again replaced. August 2002, problems were again experienced as 4hi and 4lo lights would flash simultaneously. Dealer replaced transfer case shift module. Nov 2002 when switching into A4wd, no lights would illuminate. Vehicle was taken back to dealer. Automatic transfer case update was installed. Five days later while in A4wd, lights flashed for 4hi. Shifting was completed. While stopped at a stoplight, 4lo light began flashing. When pressing gas loss of power was experienced. Lights continued to flash until vehicle was put in neutral. Vehicle shifted to 4lo. Each time shifting was completed there was a jerk in the rear of vehicle. Service 4WD light came on. Vehicle would not shift out of 4lo until turned off. Dealer test drove for several days & could not duplicate problem. Upon picking up the vehicle was told that they hoped whatever was causing the problems would completely fail & make the needed correction obvious. Upon leaving the dealership in 2hi, within 2 miles, 4hi light began to flash, shifted down & service 4WD light came on. Returned to dealership without turning off or parking so that they could see the exact state. Ran a test & indicated that the switch had malfunctioned. Switch was replaced on site. We have been in contact with Chevrolet's customer service. It is only a matter of time before a serious incident occurs as a result of their product's malfunction. Mechanic at the dealership said they are increasingly seeing similar problems with the 2002 Chevrolet Trailblazer & numerous other mechanical problems.

- Cincinnati, OH, USA