Periodically 2-3 times a year for past 6 years when driving down the high car will die, when pull over to the side of the road, car will not restart, may restart after 10 minutes or after towed to repair shop, taken to the dealer several times and several times to high end independent auto shops, no error code ever found. Read on Hummer forums issue with ignition switch, replaced ignition switch and fault has not recurred.

- Sugar Land, TX, USA

The contact owns a 2009 Hummer H3. The contact stated that the vehicle shut down and lost all power for ten minutes. The failure occurred without warning. The contact visited hiley Buick GMC (3535 w loop 820 S, fort worth, tx 76116, (817) 349-6235), but they were not aware of the failure or how to perform the repair. The vehicle was not diagnosed or repaired. The manufacturer was made aware of the failure and referred the contact to NHTSA. The failure mileage was unknown.

- Azle, TX, USA

2009 Hummer H3. Consumer writes in regards to several electrical problems and other vehicle issues. Consumer has previous complaint with another vehicle listed in artemis.

- Far Hills, NJ, USA

The contact owns a 2009 Hummer H3. While the contact's son was driving approximately 60 mph, the vehicle lost power without warning. The vehicle was pulled to the side of the road and turned off. The vehicle restarted after a couple of attempts. The vehicle was taken to a local dealer where it was diagnosed that there was engine ailure. The vehicle was not repaired. The manufacturer was made aware of the failure, but did not offer any assistance. The failure mileage was 107,000.

- Davie, FL, USA

The vehicle was purchased used @ 36954 miles. Approximately a year later (just 2 days ago) @ only 53500 miles I noticed an antifreeze smell. No visible puddle underneath. After monitoring for 1 day more popped the hood this morning and a bit of antifreeze seems to be spraying from the top of the radiator. After just googling once for "Hummer H3 radiator leak" the top link leads to hummerforums.com in which is logged many many many owners going back several years up the the present having the exact same issue. Per what is described on the 52 pages dedicated to this one thread and from what I see on my own vehicle this certainly seems to be a design/engineering flaw. It seems a rare few dealerships are owning up to this "flaw" and charging a small amount if any to repair this issue while others are pleading ignorance/innocence and making the plethora of customers eat the nearly $800 dealership repair estimate. The flaw appears to be related to metal chassis parts rubbing on the plastic radiator top creating a hole and a vibratory effect weakening that plastic causing a crack.

- Castle Rock, CO, USA

Every so often the passlock security system malfunctions and my Hummer won't start. I have to wait 10 minutes before I can start the vehicle again. It fails without warning. Its been happening more and more often. There was only 55,000 miles on the vehicle when I noticed it starting to act up. I sliced my fingers open on a job and had to drive myself to the emergency room but my Hummer wouldn't start because of the ignition security failure. I lost a lot of blood in my hand sitting waiting the 10 minutes. The doctor said I might lose the tips of my fingers because it took so long to get there. I'm sure other people had worse situations, but I seen hundreds of people with the same vehicle having the same issue. It a dangerous issue and should be recalled before a life is lost if it hasn't already.

- Jensen Beach, FL, USA

The Hummer would not start, the engine did not turn, with battery in great condition, signs of faulty ignition and passive lock system.

- Norfolk, VA, USA

P2135 throttle/pedal position sensor/switch A/B voltage correlation that puts the vehicle into "stabilitrak disabled", "traction control disabled", and "reduced engine power". while there is a tsb#11-06-04-007B regarding this issue and warranty coverage; unfortunately it does not apply to my engine. However, since this is a widely know issue, and this vehicle is experiencing the same conditions, one would think that my vehicle would be serviced under this tsb extended warranty coverage. 12/04/2014: First service attempt: Clear code everything tests fine, let"S see if it happens again. 12/10/2014: Second service attempt: Both throttle body and acc pedal position sensor tested "good". weak battery - replace battery. 12/22/2014: Third service attempt: Tech replaced accelerator pedal. Relearned throttle/idle. 12/26/2014: Forth service attempt: Relearned throttle/idle procedure. 01/13/2015: Fifth service attempt: Reprogram and apply 6 updates to ECM. 01/14/2015: Code thrown again: Dealership advising to replace throttle body (but uncertain that this will fix the problem)?

- Princeton, NJ, USA