Which parts fail
Components named in complaints (battery, alternator, wiring, ignition, instrument cluster, infotainment).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2005 Chevrolet Trailblazer EXT 370 owners, lightly cleaned up (personal details are redacted by NHTSA).
My 2005 Chevy Trailblazer is completely going crazy it seems everything electrical is going wrong with it. I am afraid to let my wife or my kids drive in it because I never know what's going to go wrong while driving. My whole gas system is gone from fuel level indicator to the gauge. My entire dashboard is not working. Lights are going out. What is crazy about this is that I am one of thousands that this is happening to. Chevy needs to fix this problem before someone does get killed. Waiting for fatalities before making Chevy fixes there awfully made vehicles is unacceptable. I understand the situation our economy is in but these thousands of Trailblazer owners that are having these problems shouldn't be paying thousands of dollars to be getting there entire electrical problem fixed. I do not know one owner of a 2006 Trailblazer that does not have this same problem. …
There is already a recall out for the 2006 model year, but I know that mine is part of it. I have a 2005 Trailblazer and the headlights keep intermittently going out as I am driving down the road. This problem as happened to me before in the past and I was able to finally remedy the issue by replacing the relay. The problem has now returned and I have even been pulled over multiple times for it. After doing a quick google search today I discovered that there are tons!!!!! Of people with the same issue going back as far as 2002. Http://www.topix.com/forum/autos/Chevrolet-Trailblazer/t32jtl93i9fkauf4n http://forums.trailvoy.com/showthread.php?t=47492 http://chevroletforum.com/forum/Trailblazer-27/2003-Trailblazer-headlights-2588/ I also ran across that GM has issued a recall for headlights, but it only covers years 2006-2008. …
I have 2005 Chevrolet Trailblazer 4wd EXT ls 4.2 liter. I noticed over past 3 years that I be at drive through for burgers and etc. The car would cut off. I did not think much of it at the time. It has gotten critically worse. It would cut off in middle of the highway, drive throughs and etc. During the past two years I have re the luster and over head dome light flicker. Head lights very dim on driving also I have replaced on this vehicle the fuel throttle and sensor, a crank sensor a cam sensor, a temp sensor 4 power steering pumps new the power steering rack and assembly wheel hubs and bearings, all new coils spark plugs, belt idle pulley power steering pulley change oil every 3,000 miles air filter change battery, updated soft ware, flush fuel system, service the air condition replaced rear shocks, GM relaced pulley on engine 2010 replaced the pvc hose flush radiator and brake …
Since October 2014 the speedometer would randomly start up at different initial points. Some days it would start at 60 MPH, 10mph and recently it starts up at 110mph. When the vehicle is in motion the needle would move when accelerating but the readings are completely inaccurate. I have read various online blogs of this same incident happening to numerous Chevy trailblazers in general. GM does not have this problem as a recall therefore I would formally like to make a complaint. Thank you for your time.
Tl* the contact owns a 2005 Chevrolet Trailblazer EXT 370. The contact stated that the when there was moisture in the air, the driver side master switch failed to operate without warning. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure and stated that the VIN was not included in NHTSA campaign number: 13V248000 (electrical system, visibility). The failure mileage was 139,000.
For the 3rd time the cluster has gone out. This results in the speedometer, temperature gauge and others to stop working. Each time I am expected to take my vehicle to a Chevrolet mechanic for diagnosis and part replacement at $700.00+ each time. This model has no recall. I am fed up with paying this much every 3-4 years for a defective part. There has never been any sign before it goes out.
Window switch panel on drivers door caught fire overnight while parked in garage. No problems before this event. Fuse blew stopping the electric current and the fire burnt out on its own. I discovered the damage in the morning as I was getting in the vehicle to drive to work.
This is in addition to complaint 10410347. After purchasing 2005 Chevy. Trailblazer (joyce Buick, mansfield, ohio) noticed instrument cluster gauges fluctuating and making strange noise. My mechanic advise take to dealer for faulty system, since was still under warranty (3 mo. Warranty). They replaced the instrument cluster cable, still not operating properly, discovered after reading owners manual that gas gauge should always register at gas level, not return to empty when turning off ignition. Now the gas gauge is not function properly as reported in previous complaint. At purchase noticed ac not cooling, joyce Buick added coolant and supposedly performed dye test prior to taking possession, reported no leak in sept. 2010. By April/May 2011 ac not working again. …
I have had the following problems with my 2005 Chevy Trailblazer EXT ls: 2008: fuel sensor failure, running board fell off 2009: head and tail lights going out frequently, windows would get stuck- could not go up or down- all dash lights flashing, car stalling out- needed circuit board replaced. Anti-theft non-functioning. 2010:windshield wipers will not shut off(replaced display board), idle pulley needs to be replaced , 4x4 running rough and making a sound,speedometer non-functioning, radio stopped working,glove box lock broke, heat/ac stopped working first on blowers 4& 5 then stopped completely I have not been able to afford to fix all these repairs, as it exceeds $2,000. Car is over warranty and was brought used from a former GM dealer at under 50K. I contacted GM in November 2010 and they stated that they my vehicle was out of warranty and they could not assist me. …
I have a 2005 Chevrolet Trailblazer EXT. Couple months ago the speedometer started acting up, I will be driving and it will stop reading my speed and going down to 0, it will get back to normal after I turn off the car and turn it back on, did that couple times, not very often, then started getting stuck on whatever speed I was going, and didn't matter if was slowing down or going faster, will stay at that speed on the speedometer, couple days ago started to go nuts, now when I am stopped reads I am at 20 or 30 MPH, and when I am going 30 or 40 starts going up and down, marking 100 MPH when I am actually going just 40 MPH, I have read several complaints about this problem with this same vehicle, a recall was issued for older models, but nothing for the 2005, I don't have the money to fix it right now, and I have to use my GPS unit to know how fast I am going, and avoid getting pull over …
Electrical complaints in other Trailblazer EXT 370 years
Frequently asked questions
How common are electrical problems on the 2005 Chevrolet Trailblazer EXT 370?
NHTSA has 101 complaints about the electrical system of the 2005 Chevrolet Trailblazer EXT 370, 43% of the model year's 237 complaints. The component named most often is instrument cluster/panel (32 mentions).
Is there a recall for 2005 Chevrolet Trailblazer EXT 370 electrical problems?
No. NHTSA lists no electrical system recall for the 2005 Chevrolet Trailblazer EXT 370. If the problem is widespread, a repair may still be covered by an extended warranty or a manufacturer service bulletin — ask a dealer.
At what mileage do 2005 Chevrolet Trailblazer EXT 370 electrical problems start?
Half of the complaints with a recorded mileage happened before about 74,000 miles, and 3% before 25,000 miles.
Is it dangerous?
Owners linked 1 crash, 1 fire and 0 injuries to electrical system problems on this model year. If you notice symptoms, have the car checked before driving further.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.