2006 Hummer H3: check engine light

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 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 May 11, 2017 · Engine · 130,000 miles · KS

Tl* the contact owns a 2006 hummer h3. While driving approximately 60 MPH, the vehicle shut down, locked up, and did not restart. The check engine indicator illuminated. The vehicle restarted later and was taken to the dealer who was unable to diagnose or duplicate the failure. The vehicle was taken to another dealer where the following codes were run for the check engine warning: c0240, p0106, p0601. The manufacturer was not made aware of the failure. The failure mileage was 130,000.

Filed Mar 20, 2017 · Driver assistance, Electrical · 50,000 miles · NJ

Tl* the contact owns a 2006 hummer h3. While driving 70 MPH, the vehicle independently decelerated to 30 MPH. The stability tracking system, check engine, and a third indicator all illuminated. The failure recurred multiple times. The vehicle was taken to a dealer where it was diagnosed that the wires over the engine failed and needed to be replaced. The vehicle was not repaired. The manufacturer was not made aware of the issue. The vehicle was included in the federal safety agency campaign number: 15v421000 (visibility). The approximate failure mileage was 50,000.

Filed Jan 14, 2017 · Engine · 100,231 miles · MA

I purchased a 2006 hummer h3 with only 100k, after performing a complete service I was made aware the cylinder heads are "defective" the vehicle was driven for 5 monthe then the check engine light came on.. A code scanner indictacted a #2 cylinder misfire replaced spark plug, coil pacack and injector no luck I was informed cylinder head need to be replaced, at what cost does the federal safety agency realize that this was a major manufacturing defects, yes gm replaced cylinder heads under warranty but with the same defective heds as to pass on the cost to the consumer as soon as the warranty expire to get their warranty money back., there has been numerous complaints and yet nthsa refuses to inform gm of the "defect" it seams all the ntsha cares about is electrical concerns on vehicles, so who make the determination the a poor designed cylinder head should be the consumers problem. This is where an individual should be held accountable, it took a threat from the federal safety agency for gm to issue a recall on the HVAC connector to get resolved., if the federal safety agency cannot understand mechanical defects should there be a recall when more than 500 complaints are achieved. So now I am out of pocket $2800.00 thanks to a administration that has no clue on mechanical issues. You should hire an individual who has mechanical degree to hold car companies responsible for poor mechanical issues so will I receive a response to this issue as we all know gm has informed dealers to give customers excuses as to why they are not liable, my conclusions indicate that the federal safety agency only acts on air bags brake switches and electrical issues nothing mechanical.....

Filed Oct 21, 2016 · Engine · 70,000 miles · TX

Tl* the contact owns a 2006 hummer h3. While driving at an unknown speed, the check engine warning indicator illuminated. The vehicle was taken to an independent mechanic who diagnosed that the second cylinder was misfiring and the head gasket and/or cylinder needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 70,000. The VIN was unavailable.

Filed Nov 12, 2015 · Engine · 133,338 miles · NV

Tl* the contact owns a 2006 hummer h3. While driving at 65 MPH, the check engine light illuminated. The vehicle was taken to an independent mechanic for diagnostic testing. The contact was informed that there was a misfire in cylinder number four. The vehicle was repaired, but the failure recurred. The manufacturer was notified of the failure. The approximate failure mileage was 133,338.

Filed Oct 16, 2015 · Engine · 80,000 miles · PA

Tl* the contact owns a 2006 hummer h3. While stopped, the check engine warning light illuminated, the vehicle started to shake, and then stalled. After several attempts, the vehicle was able to be restarted. The failure recurred multiple times intermittently. The vehicle was taken to a dealer where it was diagnosed that the cylinder head needed to be replaced. The vehicle was repaired, but the failure recurred. The manufacturer was notified of the failure. The approximate failure mileage was 80,000. Updated 1/12/16

Filed Aug 17, 2015 · Engine, Visibility · GA

2006 hummer h3. Consumer writes in regards to vehicle air conditioning system defect. *smd gm acknowledged there was a defect with the AC and a recall was issued. However, the parts were not available. Also, the engine light illuminated. The thermostat and sensor were replaced.

Filed Nov 19, 2014 · Engine · 74,188 miles · IL

Rough idle, engine light appears. In past have been told have been told gas cap related or poss thermostat or intermit misfire. Today dealership says cylinder #2 not working. Need to replace. At a cost of $3000+. Related to l52 engine concerns & intake valve seats. Including colorado & canyons. Why are some recalled, and/or fixed on manufacturer's dime, but not others? Gm knew of concern, (thus changed to llr engine). Mine fits the year and well below the VIN #. Why should 287591 h3 owners have to pay for gm's mistake?

Filed May 28, 2014 · Engine · 82,600 miles · UT

Tl* the contact owns a 2006 hummer h3. The contact stated that the engine warning light illuminated intermittently. The vehicle was taken to the dealer, who stated that the engine head and/or another component needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The approximate failure mileage was 82,600.