Automatic Transmission Control Module Problems of Chevrolet Trailblazer

When switching from 4 wheel to 2 wheel drive the transmission would occasionally disengage causing the vehicle to roll when parked, or disengage while driving.

See all problems of the 2002 Chevrolet Trailblazer 🔎.

I own a 2002 chevy Trailblazer lt. At 56,000 miles I had to have the transmission rebuilt. Then on March 12 2007 I took my car into the dealership to get the four wheel drive switch fixed because it was stuck in auto 4x4 after spending very close to a $1,000. We are now having the same problem again. Front wheels stuck in awd while the rear wheels are stuck in 2wd.

The contact owns a 2006 Chevrolet Trailblazer. The contact stated that the vehicle failed to start after multiple attempts. The contact had to recharge the battery in order to start the vehicle. The dealer stated that the pcm needed to be replaced. In addition, the headlights were too dim while driving at night. The dealer stated that the vehicle was working up to standards. The manufacturer was notified. The approximate failure mileage was 5,000.

See all problems of the 2006 Chevrolet Trailblazer 🔎.

The vehicle has stalled out 3 times in the past month. Check engine light came on and then reduced engine power light. We could only go 10 mph. Thankfully we were in a residential area and not on the freeway. Dealership said it was a faulty accelerator position module and the pcm needed to be reprogrammed. Lucky us we are over in miles and this is not covered by the warranty.

See all problems of the 2004 Chevrolet Trailblazer 🔎.

I took my 2002 Trailblazer to the dealership in Dec. Because the 4 wheel drive was not operating (I hadn't needed to use it in months) the wasn't any service light on the vehicle when I took it in. Magically, when I left the dealership the "service 4wd light" was on. After they charged me an 80. 00 diagnostic fee I was told I need a new transfer case module that would cost $400. 00. I haven't had time to take the car in over the holidays. Today when my husband was driving the car he had shut it off and just for kicks put it in 4 wheel high and it worked!! however, he was driving down the road and tried to turn the car into a gas station and it shuttered and did not want to turn. He did get it into a parking spot, put the vehicle in park and shut it off. After the vehicle was off it lunged forward about 4 feet. I called gm immediately when he came home and they said they would contact me dealership and the best they could do is pay for half of the repair!! all I can say that I thank god that there was not another car or person in front of my car when it mysteriously jumped 4 feet forward. I have noticed on the website that there are a lot of complaints about this control module-it is just an accident waiting to happen. Also, when I called the dealership to make an appointment (im afraid to drive the car) they said the soonest they could take me was on Tuesday( 4 days from now)-even after I had explained the whole situation.

See all problems of the 2003 Chevrolet Trailblazer 🔎.

2002 trail blazer 4-wd broke. Took to dealership and they told me I need a new transfer case module for $400. 00 ( vehicle not under warranty) I have used the 4wd maybe 4 times. Noticed a lot of other people on the web with similar 4wd problems. Called gm and they basically said too bad and maybe there would be a recall someday in future. Also, after I left the dealership the "service 4wd"light on the dash was lit up. Was not lit before so I am not sure how long it was broke- I only noticed it wasnt working when I tried to use it 2 weeks ago.

This is my third complaint in 3 months. This morning, I shifted from 2hi to 4hi due to ice, snow and slippery conditions. I stopped at a shop and shut off my engine. I returned, started the vehicle and pulled into the street. The lights on the transfer case dial went black and the vehicle reverted to 2hi. This is the 3rd time in three months that this has happened. My local dealer has been very good at trying to identify the problem, however, gm itself is of little assistance beyond "hoping" that nothing more serious happens. The reat question is whether the NHTSA will now do anything as a result of the numerous complaints on its webpage.

2002 Chevrolet Trailblazer -- while attempting to shift from 2hi to 4hi due to slippery road conditions the lights on the transfer case select switch flashed as usual. However, rather than remaining illuminated in 4hi, all the lights went out and the transfer to 4hi was not completed. The vehicle remained in 2hi. Turning off the vehicle and re-starting did not remedy the situation. On January 2, 2004 a Chevrolet computer technican attached a computer under the dash, but could not get a reading. The technican opened the engine compartment fuse block and removed and checked the automatic shift lock control system fuse [Mini fuse 25]. Whether he merely put it back or replaced it I do not know. However, after doing so, he worked some more on the computer and got the system re-set so it could be used. A subsequent check by my local dealer could not identify the source of the problem, but the did charge for re-programing the computer.

Upon starting the vehicle, the service 4-wd indicator light in the console area lights up, and the setting selector light does not work. The selection switch does not light up. The vehicle is new and has only 750 miles. When the dealer was contacted, I was told the service department could not look at the problem for 10 days. Additionally, I was informed that while the vehicle is probably safe to drive until they (the dealer) could assess the problem, the four wheel drive would not be working! having just been in an accident in another vehicle that was totaled, it does not give me a sense of security driving a vehicle that is not operating properly.

Transmission does not upshift. Engine at 3000 rpm will not go over 10 - 12 mph. This will last from 1/4 to a mile. No power. Have taken to dealer, says that gm knows of problem. Regional represntative george bell does not return calls. No help from gm.

While driving, unexpectedly the 4-wheel drive light went off. When this occurred, it rendered the 4 wheel drive inoperative. This was caused by a failure in the tcm module. The dealership reprogrammed the tcm module, but the problem recurred. Several TSB bulletins were issued on this problem.