Engine & cooling

2003 Hummer H2 Engine problems

Owners have filed 9 complaints about the 2003 Hummer H2's engine & cooling with NHTSA - 6% of all its complaints, most recently on February 27, 2021. They describe 0 crashes, 2 fires and 0 injuries. Stalling, loss of power, oil consumption, overheating, head gaskets, timing chains and engine failure.

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Complaints: 9
Recalls: 0
Crashes: 0
Fires: 2
Injuries: 0
Deaths: 0

Engine complaints

Electrical systemEngine & coolingFuel system

The pass lock keeps my vehicle from starting and stopping it at random, and has been doing this for years. Seems to happen to at least 85% of hummers out there if you check around, hummer forum and other places. This is very serious. Stops at intersections, and could on railroad tracks. I know that you've had complaints about this for years and ignored them, saying that you haven't had other complaints. This should be addressed by your agency, as your job is to keep the citizens safe. Not pass them off as you've...

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been doing for years on this issue with the gm pass lock system. This needs recalled before more people are killed due to this miss function on hummers. More people are having this shutdown issue than not. When it happens, you have to wait between 10 and 30 minutes with the key in the start position before it will start. So it sits in the middle of an intersection, interstate, bridge, or anywhere else during this time. Hopefully you will address this issue promptly.

Electrical systemEngine & cooling

Tl* the contact owns a 2003 hummer h2. The contact stated that the vehicle failed to start. It took the contact up to thirty minutes to start the vehicle and the lock warning indicator illuminated. The vehicle was taken to an independent mechanic and the ignition switch was repaired, but the failure recurred. The vehicle was not repaired. The manufacturer and dealer were not notified. The failure mileage was 45,000. *Dt

Engine & coolingFire

Exhaust manifold bolts rusted off and the vehicle makes a ticking sound. I just observed a video explaining that this is a common problem. It also may cause other emissions related problems. Call me day or night for any further information. This vehicle has had nothing but problems and an unrelated engine fire due to the faulty windshield wiper motor in 2009. *Tr

Engine & coolingFire

A parked hummer h2 2003 was spontaneously combusted and destroyed. The suv was driven that fateful day for about 15 minutes back and forth to a grocery store and parked in our driveway. Engine was off and key was out. About 10 minutes later, my daughter noticed the engine on fire and panicked. Called 911. Fire engine hosed the fire out in the next 1/2 hour but the suv was charred and the front of the house damaged badly. We had kept the h2 well maintained and serviced it regularly. There were no...

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mechanical or electrical issues otherwise. We are a non-smoking family. Very sad to see our pride and joy burnt to ashes. My family could have been badly hurt. Please investigate so others could be saved from the catastrophe we are going through. *Tr

Engine & cooling

I WAS DRIVING THE TRUCK AND IT TURNED OFF. *TR

Engine & cooling

I have a 2003 hummer h2, and I have a few broken bolts on my exhaust manifolds. I've learned that this is a problem with these engines through online research. Also I had to replace my catalytic's because of this issue. My mechanic has told me that this is a very expensive repair, can anyone help me? *Tt

Engine & coolingTransmission & drivetrain

2003 Hummer h2 transmission cooler ruptured which leaked transmission fluid into engine coolant. Required replacement of radiator, all coolant hoses and flushing both the transmission fluid and engine coolant. Cost was $1,400. Unknown if transmission was damaged from contamination of fluid. *Tr

Engine & cooling

Engine overheating with h2 hummer, stranded on roadside 100+ temp. *Nm

SteeringBrakesEngine & coolingElectrical systemBody, doors & structure

I bought a 2003 hummer h2 brand new. Since the day I got it had many problems, both electrical and mechanical. The steering is very hard and the breaking is ineffective at times. I showed them a copy of the bulletin on this website. They did not acknowledge any problems. The issue still persists. Many electrical issues seat memory problems, mirror don't work..Etc. Eventually the electrical issues fixed. Roof leaking water from the reading light on two occasions once because of sunroof issue and the second time...

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because of the outside roof light. Now most recently I have been having a problem with the "check engine oil" light comes on every 5 to 6 weeks and way before an oil change is due. This has happened at least 5 times so far. Everytime the engine is missing oil. The dealer says that hummer allows the engine to burn one quart of oil for every 100 gals of fuel. I said what am I supposed to do when that light comes on. The service manager said pull off the road and check the oil. I said what am I supposed to do if the oil is low. He said add oil to the engine. I said so I have to drive with a couple of quarts of oil in the back all the time? The light comes on every 5 to 6 weeks. I said how many hummers have you sold? He said many. I said how many you know of do that? He said none. I said if none do that, why does mine do it? And if this normal why none of the others do it? The dealer refuses to acknowledge any leak of oil or any burning of oil by the engine!!!!!!! *Nm

Hummer H2 engine complaints by year

2002 92003 2004 2005 2006 2007 2008 2009

H2 engine problems, every year

Source: U.S. National Highway Traffic Safety Administration (NHTSA) complaints and recalls, checked yesterday. Complaints are owners' own reports and are not verified. How we use the data

2003 Hummer H2 Engine problems

Engine complaints

Hummer H2 engine complaints by year

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