2004 Chevrolet Trailblazer: sudden loss of power

Filed Jan 6, 2022 · Electrical, Engine · TX

Electronic throttle body? No throttle control, motor will only idle, turn ignition switch off, then restart it will run. Reduced Engine Power light comes on. Happens for no apparent reason. Very unsafe situation.

Filed Jan 16, 2019 · Engine · 161,000 miles · NC

2004 chevy trailblazer keeps getting cam position sensor fault. Causing check engine light to come on. Seems to be a common problem with this model. We have replaced this part three to four times on our truck. Truck began to run rough engine knocked and had reduced power.

Filed Jan 8, 2015 · Engine, Transmission · 150,000 miles · GA

Engine started misfiring on random cylinders,misfire does not stay on same cylinders. Has dramatic loss of power. Diagnostic code says random misfire. Dramatically decreased fuel economy. Bad vibration. Service engine light flashes during misfire. Does not have a constant misfire, it comes and goes.

Filed May 18, 2014 · Electrical, Transmission · 120,000 miles · MO

This was actually the second or third incident where the key got stuck in the ignition, blazer was in park the lights remained on so did the radio anything that is typically on during aux, but this was the beginning of a long problem that lead to me trading off..the key gets stuck you can not remove it caused the battery to go bad, it would begin to happen often the service engine soon light would come on, the transmission would not shift above 3rd gear, also shortly after the purchase in sept of 2011 the speedometer stopped working. The blazer died 3 times gauges on dash would periodicly stop working. My service 4 wheel would come on randomly the key issue was the biggest problem but it was only a matter of time before other things went wrong. When the key would get stuck in the igintion as stated the transmission would not shift properly in the beginning the transmission would act out once you took it out of park it was noticeable but as the problem became worse it started happening driving down the highway I noticed once that I have successfully made it through 1-2-3 but never got out of 3. I should state that when the key was stuck I would have to manually shift through the first and second then put it into drive otherwise the car had no power because it would be stuck in the higher gear.tried to contact the dealership as there was a recall on the dash for the 2003 model and they told us it wasnt a safety problem I do not understand how random loss of power and random car dying is not a safety issue, I have been watching the list of gm recalls and I have not seen much about the trailblazers, and it bothers me that I am sure there are other issues like the ones that I had. On another note transmission related my neighbors just had to get rid of their trailblazer 2006 for transmission problems.

Filed Apr 27, 2011 · Acceleration · 59,300 miles · IL

Vehicle goes into shutdown mode with an unresponsive accelerator. Motor still runs but no acceleration. This is a serious safety issue when driving in traffic as you have no power to get out of traffic and harms way. There is no warning that a problem is imminent. A reduced power light comes on and you're stuck. Vehicle in question is a 2004 chevrolet trailblazer.

Filed Jan 6, 2010 · Electrical, Locks · 74,000 miles · MT

In september 2009, my 2004 trailblazer started going haywire! It lost all power (while going down the interstate), the power/cigarette outlets stopped working, the doors started locking themselves (sometimes with the keys in the ignition) , the radio would go loud or stop working, my speedometer went nuts (like saying that I was doing 65mph, when I was at a complete stop or 120mph down the hwy), the service engine soon light would go on and off,and my heater will not blow out the vents in the dash. We have taken it to a mechanic. He tried everything from replacing the battery, fuel filter, and spark plugs. He even hooked it up to his scanner (which showed that there was nothing wrong with the car) all this and $700.00 later I still have the same problems. Now I'm told that the electrical panel will need to be replaced at a cost around $500-$900!! If you look at carcomplaints.com you see that there are many more people like me with the same car and the same problems. This is a huge safety issue.how long will it be before someone pushes chevy into doing a recall? Does someone have to be killed or kill someone else for this to happen? I was so glad to google car complaints and find that it wasn't just me that was having so many problems with this trailblazer.

Filed Aug 17, 2009 · Brakes, Electrical · 70,000 miles · FL

Had p0128 code for about 1 year. Replaced thermostat after p1680 code, reduced engine power light came on. Reduced engine power light went away on next crank up to move vehicle and change thermostat. Abs and brake lights both on intermittently. Tachometer has been sticking and speedometer showed erratic signs around 55 MPH. Now all gauges going wacko or not working at all at times. Temperature gauge wrapped completely around without even starting cold engine. About a mile later, instrument panel lit completely up then went away, gauges reset, and ran fine with properly operating instrument panel... At least until I got home. Then wacko stuff again. Reset PCM by disconnecting battery cable, now things seem fine... For now. I'm told to redo bad ground on ecbm before suspecting bad ABS module and to replace ignition switch before suspecting bad instrument cluster and PCM. However, dealer analysis said ABS module got moisture in it and the instrument panel needs to be replace. First is a $1000 ABS module, second is a $400 panel, both have labor charges additional.

Filed Feb 10, 2009 · Electrical, Transmission · 56,000 miles · IA

I own a 2004 chevy trailblazer with 56k mileage. In december 2008, the speedometer stopped working. I would be at stop, and the needle showed 80 MPH. I brought the car to the dealership right away and they told me that the cluster needs to be replaced - but they needed to order the replacement part. I finally got it fixed a week later and it cost me approximately $525. Now, for the past two weeks, the engine had suddenly shut off in the middle of driving. The "reduced power" & "check engine" lights came on. Both times, it started back up after I parked it, turned off the ignition, and re-started. But after the second time, I brought it in to the dealership. I had to have the accelerator pedal replaced. Cost me approx $360. These two issues are very concerning with me because if I were driving at higher speed (65mph) in the middle of the highway (instead of 30mph around town), I could have died from contacts with other vehicles because my vehicles stopped functioning!

Filed Aug 29, 2008 · Electrical, Engine · 32,000 miles · PA

I purchased a used 2004 chevy trailblazer in february 08. It only had 23,000 miles on it. With in the first 2 weeks I had it my gauges started going crazy. They were jumping around all over the place. I took it back to the dealer to have it fixed and they tried to charge me. Fortunately I must have complained enough and to the right person because it was replaced at no charge to my self. I now am having major problems with it stalling and trying to stall. After searching the internet I see that I am not alone there are hundreds of complaints about this problem. Everyday upon start up it idles very rough and it tries to stall for a good 10 minutes. If I don't let it sit and idle before I drive it tends to stall. My check engine light will flicker at least once a day and every few days my reduced engine power light will flicker. I do not feel safe anymore. What if I am traveling and my car stalls and I lose control and from reading the other complaints I am at risk for my air bags not deploying. If it is a problem with the PCM, I don't have the money to fix it!!!!! Why should I have too? I see that I am not alone with this problem. Why is their nothing being done about it? Why should us as consumer already paying enough for these vehicles be responsible for their mistakes?

Filed Apr 1, 2008 · Electrical · 15,000 miles · FL

"service engine soon" light would flash on then immediately off, truck would feel like it momentarily lost power while driving. Recently the fuses for all the gauges have been blowing out repetitively. The speedometer does it more than the others. Have replaced them several times in the past three months. Chevy was helpfully "guessing" at first but finally told us there was nothing they could do towards the end of our 3 year warranty. We haven't taken it back to them for the ongoing problems.

Filed Jun 15, 2007 · Transmission · 25,605 miles · PA

2004 chevrolet trailblazer 2 wheel drive (2wd) transmission failure. Transmission failed while under normal highway operating conditions, speed approximately 55 MPH, two lane highway, surface conditions dry, mileage 25605. Failure proceeded by strange noise, then complete disengagement / loss of power. Service engine check light illuminated; later diagnosed by gmc dealorship as an open / loose gas cap as th e cause. The vehicle was manuevered / coasted without powertrain assistance to parking lot adjacent to the highway without injury / incident. Vehicle towed to dealorshi on . 6/15/07) informed by gm representative that component replacement / repair needed, specifics unknown, cost $2400 of which gm would pay 50%; my cost $1200.

Filed Jan 28, 2007 · Electrical · 34,000 miles · FL

Dash warning lights come on/stay on/go off randomly. Additionally, on four separate occasions, decreased engine power has occurred. Shutting vehicle down with a restart has always solved the "decreased power" issue. But dealership & an independent garage cannot fix due to "no codes stored". Warning light involved are: service engine soon, oil change due and reduced power. This is an ongoing problem having started almost as soon as we took delivery of vehicle new with 250 miles .