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.
Hummer H3 misfire problems
32 of the 790 owner complaints about the Hummer H3 describe misfire or rough idle, most of them for the 2006 model year.
- owner complaints
- 32
- worst model year
- 2006
- typical repair cost reported
- $2,800
- typical mileage
- 74,188
Is there a fix? No recall or service bulletin covers this area of the car yet.
By model year
Often reported together
Trouble codes mentioned
P0300 4P0014 1
What owners say
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.
Vehicle misfires frequently. Engine will nearly stall at idle due to misfires and shake the whole vehicle. Lack of power and efficiency. And juddering while accelerating. It is known to gm and many people have had to resort to cylinder head replacements costing hundreds at a minimum.
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.
Vehicle instrument panel warning shows: service traction control reduced power stability system failed vehicle misfires when this happens sometimes vehicle shuts off in the middle of the road when trying to restart it does not restart sometimes after this
1) 1.5 years ago we started getting "misfire on cylinder 5" code and now it is multiple misfires. 2) my fancy rims are peeling
There are many forums about cylinder misfires - especially after the warranty runs out. I looked it up and was shocked to see how many other people have had the same issue and nothing has been done about it. Every hummer owner I know has paid thousands of dollars to get their problems fixed. Why is there not a recall when so many have the same problem?? The idle is rough. The engine sputters. The light goes on and off constantly.
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.....
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.
The vehicle just lost power and almost lost ignition while driving 50 miles an hour. Diagnostic code state, misfire in cylinder one. Valve springs ( rocker arm) are breaking prematurely causing a leaking valve problem. Mechanic also noticed other springs were fatiqued causing a looser than normal seating. Gm service manager mention a spring problem on 2006 2007 rendevous. One of the largest complaints with the hummer 3 is this leaky valve syndrom which the dealers know about. Some occuring with the vehicle having only 30,000 plus miles.
Related recalls
No recalls on record for this model year.
Questions about the Hummer H3 misfire
Which Hummer H3 years have misfire or rough idle problems?
The model years with the most reports are 2006 (23 complaints), 2007 (8 complaints) and 2008 (1 complaints).
How much does it cost to fix misfire or rough idle on the Hummer H3?
Owners who mentioned a price put the repair at about $2,800 (median of 5 complaints that include a dollar amount). Costs vary with mileage, warranty and where the work is done.
VIN decoder
See the problems and recalls for an exact car
Buying a used Hummer H3?
Check the exact car before you pay: accidents, salvage or flood titles, odometer readings and previous owners.
Check its history