I have a 2005 Trailblazer as well and have had nothing but problems with it. The first was when the 4WD knob broke off. Then the fuel gauge stopped working. I also have a wiring problem that causes interference between the speakers and the accelerator (I hear a high pitched whizzing noise when I press on the accelerator). In the fall of 2009 the speedometer started malfunctioning like the problems that other posters have had. In the past year the oil gauge has now stopped working. The most recent defect in this glorified hunk of metal is a crack in the exhaust manifold.

I will never purchase another GM product due to the number of problems and lack of customer support from the company. I cannot say that I am surprised that the company has gone bankrupt.

I have had my trailblazer for 3 1/2 years. The first winter I owned the truck, the speedometer went haywire, the second winter the oil gauge went, the third winter I lost the gas gauge. Now it is June and the back trunk latch will not unlock!!!!!! Plus the oil light and engine light has been on and off since a few months ago and the oil has been changed twice since and its STILL on!! But the back door not unlatching is my final straw!!!!!!!!! I have been putting my life and my children's lives in danger since the first winter. I do not have $500 to replace it!! I have loved Chevy's since I was a little girl and now I think its time for a change!!!

First problem was the speedometer, malfunctioning, then sticking. Then gas gauge went inaccurate, and eventuall showed zero with light on even with full tank. Next the oil gauge quit working so I can't monitor oil pressure. Next thing happened was check engine light came on and stays on, no matter what my mechanics do. I've not replaced anything and I use a Garmin GPS as a speedometer. I like the vehicle (except gas mileage), and I mostly buy American, but I'm really disappointed in this instrument cluster and the money it takes to fix it. May have a serious effect on what my next car will be.

Bought a 2005 Chevy trailblazer 4.2L automatic. The vehicle has appox 65k ....just like alot of other complaints i read....the damn instrument cluster is going screwy....the oil pressure gauge works when it feels like it....reads between 0 to 60 but mostly it stays at 0.....now the other day the gas gauge took a crap...i filled it up full and it read empty and the fuel light was on. What else is next to go with this POS vehicle.....funny thing is....why do things go wrong just when you finish paying off the loan.....LOL!!!!!. I will never buy another Chevy vehicle again!!!!!!!!!!!! I waited 5 long years( with out a single problem) to pay it off and whammmm here starts the vehicle braking down!!!!!

Same as everyone else. Fuel gauge don't work so wait till my low fuel light comes on most of the times before i fill up. oil gauge reads what it wants to from 0 to 60 psi. And amp gauge always reads between 14 and 16. haven't had any problems with speddo yet but gonna have to pay to have it fixed because check engine light stays on with no codes found and shop said they cant inspect it with light on. So time to spend some money on this piece of crap. and just vented to Chevy on there website and they had the nerve to call me to tell me there is no recall on this at this time. Well no sh*t, tell me something i don't know.

And now to find out from a friend who owns a shop that works on my cars that the reason i have had to replace my battery every winter is gauge cluster also. Gonna ditch Chevy from now on and go to Honda because they at least they recall there problems.

THANK YOU GM! I am 48 years old and NEVER had a speeding ticket until YOUR crappy-made speedometer malfunctioned. It said I was doing 65 but the state trooper said I was doing 81 in a 70 mph zone. I got a gps and guess what? THE TROOPER WAS RIGHT! I checked with a dealer about repairs and I still have a bruise on my chin from where my jaw hit the floor when they told me "approximately" how much it could cost. I have bought nothing but GM products since 1986 when I bought a new S-10, but rest assured this piece of crap will be the last. It's bad enough that the six cylinder engine only gets 17 mpg AT BEST, but now I don't know how fast I'm going either! No dang wonder the government had to bail your sorry butt out! I've had the radio replaced twice (under warranty), both doors rattle, the dash rattles on the passenger side, The sppedometer doesn't work, the gas gauge is inaccurate, and the trim is broken around the base of both front seats.

Nothing really major except the speedometer, but thanks to you my insurance will go up because of this ticket, so your inferior product is going to cost me for at least 3 years. Have I driven a Ford lately? No, I quit buying Fords after a bad experience with a 76 Ford, so I guess now we'll try Chrysler.

Bought this vehicle in july 2006. The gas gauage quit working in about october the following year, after buying it The service engine light came on Had it hooked up to computers tried a couple of fixes and it came back on. Now the gas light is almost always on, the tank almost always shows empty even after filling. Or it will move up a little and go back to I paid to have it fixed then several months later it quit again and I HAVENT FIXED IT again, I just keep putting gas in and marking miles. very annoying and very dangerous as the car does stall and sputters from time to time but still dont have the money to fix it./

Also, the heater quit working first on 5 then 4 , That has been about 2 years now and I had it looked at and told what it would cost alot to fix, again defect I can afford to fix. Now the heater only blows warm air and started that about a month ago and it only blow on the drivers side the rest of the car blows cold air and its getting winter so I may have to fix now as I travel with a little girl.

first fuel gauge stopped working then RPM gauge went from zero to 7 and then straight down. Now my speedometer is not working right. It will start out working and then all of a sudden I'll look down and it is on zero when I am doing 55 MPH. I consider this to be very unsafe!

Update from Jul 23, 2014: instrument panels have not worked in over a year and a half. When I complaint about it they wanted me to spend 250 just for the parts. This should be fix by GM, I've heard it is very common in the 2005 models.

Update from Jul 23, 2014: same problem

After reading everyone elses problem I figured I'd post mine to the list.

At aprox 38000 miles (car just out of warranty) the fuel gauge sending unit went out. Needle stayed on empty all the time with low fuel light on. Wife drove for quite awhile like this and kept track of her fuel w/ trip meter. Repaired myself for aprox $140.

At aprox. 88000 fuel gauge quit working again. This time the needle is in the 7oclock position, but the low fuel light still works correctly. I determined this to be the stepper unit on instrument cluster. There are complaints on this all over the net.

Now at 92000 miles the oil pressure gauge is acting erratic. It is stuck at 20lbs when vehicle is shut off, reads 60lbs at idle (should be 30) and 80lbs at speed (should be around 45-50).

Called the toll free # someone listed, all they wanted to do is send me to the dealer. No warranty, re-call or agreement to repair.

Guess I'll spend another Saturday afternoon working on this piece of sh*t!