Hummer H3 check engine light comes on

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 Oct 24, 2022 · Engine · MO

The contact owns a 2008 Hummer H3. The contact stated that while driving at various speeds, an abnormal knocking sound was coming from the engine. The check engine warning light was illuminated. The contact stated that the failure worsened while driving at highway speeds. The contact called the dealer and the manufacturer and notified them about the failure. The contact was informed by both that there were no recalls on the vehicle. The vehicle was not repaired. The failure mileage was unknown.

Filed Jun 21, 2021 · Engine, Visibility · 160,000 miles · TX

The contact owns a 2007 Hummer H3. The contact stated while driving at 50 mph, the vehicle started to overheat and stalled. The contact stated the temperature and the check engine warning light were illuminated. The vehicle was then towed to a local dealer where it has yet to be diagnosed due to the battery needing to be replaced. The vehicle was not repaired. The contact had the vehicle serviced under the federal safety agency campaign number: 15V421000 (Visibility) prior to experiencing the failure. The manufacturer had not been informed of the failure. The failure mileage was approximately 160,000.

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 Dec 19, 2019 · Fuel system · 135,000 miles · GA

Went out to start h3, turned key, check engine light came on, the battery light came on and the anti-theft system light came on. Passlock/security system inside the steering column is bad. Car won't start. Is unsafe and will strand owner without warning by not starting. Goes into security mode. Was told to wait 10 min and try again. Can't turn it off at gas pump for fear of it locking me out and not starting. I had this happen to me 4 times in one day. So many complaints all over the internet and people trying to fix this issue. There is even a company selling a part to bypass this and the security system which again is another issue. Gm is clearly aware of this issue. This needs to be recalled. Stranding people can be very dangerous. If there is an emergency and the car won't start. All around bad business by gm for not issuing this recall. This has nothing to do with mileage which gm manager said on the phone. These h3's are know from this fresh off the dealership floor. People are being forced to take it to a dealership for repair and replacing the part when the labor costs more than the part. Seem like a monopoly for gm and its dealerships. I have seen anywhere from 1500-2000.00 to install and rectify this bad part at the gm dealerships.

Filed Mar 8, 2018 · Engine · 136,000 miles · FL

Tl* the contact owns a 2007 hummer h3. While driving various speeds and approaching a stop, the vehicle overheated. The check engine warning indicator illuminated. The contact coasted to the side of the road, powered off the vehicle, and waited for a few minutes to restart it and resume driving. The vehicle was taken to stingray chevrolet bartow (1475 w main st, bartow, fl 33830, (863) 800-9999) where it was diagnosed that the speed sensor failed and needed to be replaced. The vehicle was not repaired. The vehicle was later taken to an independent mechanic where the thermostat was replaced; however, the failure recurred. The manufacturer was not contacted. The approximate failure mileage was 136,000.

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.....