Common Chevrolet TrailBlazer GMC Envoy Problems


In this video we discuss (and rant) common problems with Chevrolet TrailBlazer and GMC Envoy vehicles. Love them or hate them they are here to stay and driving (or being towed) to a shop near you! GM pulled out all the engineering stops when creating this special breed of SUV and we break down (literally) the most common problems with these vehicles.

Check out these other helpful TrailBlazer repair videos:

Water pump and fan clutch tips:

Crank Sensor Replacement:

Upper and Lower Ball Joint Service:

Cam Sensor Diagnose and Repair:

Service Airbag and code C0550:

Hub Bearing Replacement:

HVAC compressor bypass hack:

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  1. I have a 2006 chevy trailblazer LS 4.2 its a 2 or 4 wheel drive. I had a small oil leak. Nothing to major. Had the truck 8 months. All of a sudden my oil light came on and tge gauge still read full. Get out of the truck and the stick was bone dry and oil was running out from the passenger rear end close to the rear tire. Never had this problem before. Someone saud possibly dirt got in my oil tank and clogged tge filters somewhere. Any suggestions?

  2. Hey I got a 2004 Trailblazer 6 cylinder you can smell gas at the rear tail pipe and it and it has a miss and misses out constantly and every once in awhile I get a bang at the back tail pipe it'll explode you know like it's electrics been coming on and going off again you don't filled up with gas and then blows up stuff like that

  3. I have an 04 and seen some of these problems, cam and crank sensors, misfire, fuel pressure regulator leaking fuel and water pump (what were they thinking). But really sixteen years 150,000+ miles still running strong very good value, shame gm doesn't sell them in the US anymore. Great video

  4. My wife has a 04 trailblazer and she wants to change the headlight setup… she wants the high and low beam headlights on when on high like my 09 g6. Is there a way to set it up?

  5. I had a 2004 Trail Blazer for five years. Would drive it 3,000 mile vacation every year and was driven daily. Only thing I had to replace was water pump once and tires.

  6. Hello Car Doctor, love Your videos, and Curious Why you think the trailblazer 4.2 I6 has valve cover seals around spark plugs constantly leaking and going bad?

  7. Okay so I have a problem and can’t figure this out. My 03 gmc envoy xl with a 4.2 vibrates at idle. I’ve replaced both koto mounts, all plugs and coils, the thro body, the water pump, the thermostat, the purge valve solenoid. It idles at 620’s but occasionally it drops for a second and almost stalls but then goes back up and keeps vibrating. Please help, any advice would be great. I’ve heard the o2 sensor and harmonic balancer, but I’m just not sure. It has a p0440

  8. Why would the rear twerk out going over humps in road? Have replaced all sway bar links, shocks and struts, control arms, steering rack with tie rod ins, new alignment and nothing seems to work. It drives great except going over a hump it lifts and when it comes down it sways the rear.

  9. I got a 2008 chevy trailblazer with 4.2 and over 60mph it'll cut my gas patel off and slows down and starts missing bad and won't go no where and let it sit turned off for 5mins and you can go on your way again but starts again if your going over 60mph and it throws codes P0068 and P0101 and P0106 and P0171 and thats it know whats wrong?


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