Notes: The 2002-2007 Chevrolet Trailblazer is known for many things, but perhaps it is most famous for its faulty fuel gauge.

This gauge flip-flops more than a politician during election season. Some report that the gauge says "empty" after a fill-up, while others report the gauge says "full" when they're running on fumes. Either way, there's one thing everyone seems to agree on: the darn thing is just wrong.

Following hundreds of complaints and a few accidents allegedly caused by the malfunction, the National Highway Traffic Safety Administration (NHTSA) opened an investigation into the issue in May 2011. Unfortunately for frustrated owners, no recall has been announced.


pretty bad
Typical Repair Cost:
Average Mileage:
66,600 miles
Total Complaints:
5 complaints

Most Common Solutions:

  1. not sure (4 reports)
  2. replace bearing on the idler pulley (1 reports)
2007 Chevrolet Trailblazer engine problems

engine problem

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2007 Chevrolet Trailblazer Owner Comments

problem #5

Apr 082014


  • Automatic transmission
  • 63,000 miles


Vehicle has intermittent loud squeal at highway speed over 50 mph, usually during acceleration to pass. Sound appears to be coming from left front side of engine. Also happens while maintaining highway speed. Been to dealer and other service facilities. I have replaced both idler pulleys. Suggestions that it could be the A/C compressor/clutch, water pump or even power steering pump. No one has been able to pinpoint the noise. Does not seem to occur when A/C is on. Extended warranty is about to expire soon. Problem started in early April after replacing air filter, although that is not believed to connected to the problem. Being the noise is intermittent, it conveniently doesn't happen when mechanic is in the vehicle.

Any suggestions?

- , Pittsburgh, PA, US

problem #4

Oct 022012


  • Automatic transmission
  • 45,000 miles

the loud noise increased with acceleration. It sounded like a vacuum was messed up. I thought it was the power steering pump, but the steering worked fine. After hearing about someone else with the same issue, I did some investigation. We used a hose to hear the pulleys individually (be careful of the fan!). There was a bit more noise from the idler pulley. We took the belt off and checked the pulley. It was stiff and didn't turn smoothly. We replaced the bearing in the pulley (I figured it was needed even if it didn't help the sound). The part the book called for at the autoparts store was not the same. We got the bearing number off the old part and matched it. I couldn't believe how quiet the engine was after that! The pulley was just under $40 with tax and all. It took less than an hour. The Trailblazer runs fine now and it so much quieter.

- , Mount Vernon, MO, USA

problem #3

Dec 122010

Trailblazer LT 3.2L V6

  • Automatic transmission
  • 95,000 miles

When u start up car it whines almost like it doesn't have enough power. when you accelerate it make s a loud whining noise. i replaced the alternator and it didn't make a difference.Still loud and annoying to drive.

- , Boardman, OH, USA

problem #2

Oct 012010

Trailblazer LS V6

  • Automatic transmission
  • 50,000 miles

The engine wines on acceleration! Its f'n annoying!!!!! Thought it was the alternator pulley, but I changed that out and the problem still exists! The more I step on the gas, the louder it gets! GM and Chevy should recall this vehicle to correct this problem and fix it for free!! And the engineer should never design anything ever again!

- , Panama City Beach, FL, USA

problem #1

Feb 182010


  • Automatic transmission
  • 80,000 miles

The vehicle starting making a squealing noise upon acceleration. The longer I let it go the more noise it is making. Unsure what the problem is. Some think it's the pulley arm, some think it's the water pump. It sounds like a siren going off when your driving down the road. This vehicle is a money pit, GM should be ashamed!! But they don't seem to give a hoot about their customers. The garages keep telling me that these issues are not uncommon with this particular vehicle. I hate it, and owe too much to dump it.

- , Randolph, NH, USA

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