2006 Hummer H3 engine problems

Filed Jan 14, 2026 · Body, Engine · 130,000 miles · IN

The contact owns a 2006 Hummer H3. The contact stated that the frame was rusted on the driver's side. The check engine warning light was illuminated. The contact looked underneath the vehicle and was able to see through the subframe. The contact also noticed cracks in sub frame. The contact was concerned about driving the vehicle. The vehicle was taken to an independent mechanic who determined there was an issue with the temperature sensor. While receiving an oil change, it was determined that the subframe was rusted. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was contacted and confirmed that there was no recall coverage for the failure. The failure mileage was approximately 130,000.

Filed Nov 11, 2025 · Engine · KY

The blower resistor and harness needs replaced it looks like it caught fire or default

Filed Jan 2, 2025 · Electrical, Engine · TX

On the electrical, I refer to my air conditioning and heater. When I have my air selection to coldest and I drop 1 click for it to be less cool, my heater turns on and at times it smells like something burning. I have to turn it off . On the engine, after I hit 90,000 miles, I have to fill up my engine oil every 2-3 weeks because my vehicle is burning it quick or something. It doesn't leak oil at all. The oil just seems like it's burning somewhere and I ha e to be waisting money to buy oil $30 to $60 a month. Please help. Thank you!

Filed Aug 27, 2024 · Engine · FL

Was heading home from work and the 2006 Hummer H3 shut off while traveling in the middle of traffic was able to cruise in Nuetral until I could stop to start car again started car and yet again I receive a cylinder misfire code which has been repaired on multiple attempts still no success. I am going to end up either crashing or an emergency vehichle will be trying to get by and I can't move because the motor shut down.

Filed Aug 22, 2024 · Engine · FL

Engine has very bad rough idle after multiple attempts to repair will get a misfire code often that goes on and comes off engine has rough idle to the point where truck shuts off completely while waiting at traffic light. My safety is at risk as this could happen during driving causing a wreck or during a light change when the emergency vehicles need me to move over and my truck don't run. Vehicle was inspected by multiple mechanic and still has issues. Check engine light comes on at time of motor failure or when rough idle.

Filed Feb 7, 2021 · Engine · 105,498 miles · TX

P0305 cel code came on and took it to a mechanic. They diagnosed the issue and did a compression test which produced results of cylinder 5 having 70 psi and the other cylinders were normal. Determine that the valves seats are bad and it is a common issue on the hummer h3. Total cost for repairs was projected to be $9,000 for all parts and labor.

Filed Feb 25, 2019 · Engine · 130,000 miles · NV

P0300 code. Engine misfire. The hummer forums I've researched say it's a common problem in these cars, manufactured before march 31, 2006. It seems the engine heads do not have properly hardened valve seats. Again, I'm finding this is a common problem and gm is fully aware of it.

Filed Jan 22, 2019 · Electrical, Engine · CA

I have owned this car for 10 years. Its always giving me problems. Especially the electrical and engine. I've gotten 3 notices in the mail for recalls and gm has ignored my request. At this time I am holding them responsible because my hummer h3 is always in and out of the shop and dont feel like ive gotten the value I deserve on my purchase. Please give me call at [xxx]. Imy name is [xxx]. Even though there are no more hummer dealerships and no one specializes in the care of this vehicle, I have taken complete care inside and outside of my investment and hope to get some type of leeway in this matter. Thank you. Information redacted pursuant to the freedom of information act (foia), 5 u.s.c. 552(b)(6). *cc

Filed Dec 19, 2018 · Electrical, Engine · 100,000 miles · IL

Tl* the contact owns a 2006 hummer h3. The contact stated that the vehicle failed to start intermittently. All the warning indicators illuminated on the instrument panel. The vehicle was taken to cadillac of naperville (located at 1507 ogden ave, naperville, il 60540, (630) 355-2700) where diagnostic testing was completed, but a failure code could not be found. The vehicle was not repaired. The manufacturer was notified and did not assist. The approximate failure mileage was 100,000. *tt consumer stated anti-theft device was malfunctioning.

Filed Nov 5, 2018 · Engine · GA

My truck is burning excessive oil between oil changes