NHTSA — Engine Problems

2007 Hummer H3 (Page 1 of 3)


really awful
Crashes / Fires:
1 / 1
Injuries / Deaths:
0 / 0
Average Mileage:
82,127 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2007 Hummer H3 engine problems

engine problem

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2007 Hummer H3 Owner Comments (Page 1 of 3)

problem #41

Aug 082020


  • 179,000 miles


Oil light comes on when idle. Truck loses pressure. No dealership solution.

- Kent, WA, USA

problem #40

Dec 242019


  • 120,000 miles
The contact owns a 2007 Hummer H3. While driving 35 mph, the engine oil indicator illuminated and an odor emitted from the vehicle. The contact replaced the oil and took the vehicle to an independent mechanic where it was discovered that there was a small hole in the manifold, which burned out the oil. The contact paid out of pocket to have the vehicle repaired. The manufacturer was notified and filed a claim. The contact was referred to NHTSA to file a complaint. The dealer was not contacted. The failure mileage was 120,000.

- Yelm, WA, USA

problem #39

Dec 102019


  • 160,000 miles
Driving down the road and it stop and it would not start engine lock

- Lee, NH, USA

problem #38

Aug 152019


  • 84,822 miles


The contact owns a 2007 Hummer H3. The contact stated that the engine failed to start. The contact had to sit in the vehicle and wait a while before attempting to start the vehicle. The failure occurred at any given moment and was becoming more frequent. In addition, the pass lock warning indicator illuminated on the instrument panel. The dealer was not contacted. The manufacturer was made aware of the failure. The contact replaced the manifold and was reimbursed. The failure mileage was 84,822. The VIN was unknown.

- Layton, UT, USA

problem #37

Apr 042019


  • 123,000 miles
Hummer will not start, engine turns over normally, but will not start. Wait exactly 10 minutes and it starts up fine. Can happen any time, at the gas station, first thing in the morning. Learned that if the security light on the dash blinks when the key is turned on, the vehicle will not start. If light stays on, the vehicle starts. Have watched for this at every start up, can now tell when the vehicle won't start. This is a major problem with GM vehicles with pass lock since the late 1990S, GM need to take responsibility for this problem now!!!!!!!!!!

- Monterey, TN, USA

problem #36

Aug 042017


  • 97,000 miles
If returning soon after shut off ; it will not restart. Have to wait awhile for it to restart. It's weird because there are no other problems. It has been doing this for awhile now.

- White Oak, NC, USA

problem #35

Dec 012017


  • 105,000 miles


Sir/MA'am, I am writing to complain about the 2007 Hummer H3 security system not allowing the vehicle to start under certain conditions. I maintain my vehicle to high standards and over the last 8 months have had issues starting my Hummer. When the Hummer does not start, you must wait 10-15 minutes to even attempt to restart. The vehicle will turn over, but no fuel is sent to the engine to start. If it doesn't start again, you must wait another 10-15 minutes. The latter has happened to me 5 or 6 times in just the last 2 months. There have been numerous complaints to GM about this exact issue, and has fallen on deaf ears. Many vehicle forum users complain of the exact issue as well, with zero assistance from GM as seen here: Https://www.cargurus.com/cars/discussion-C8039_ds531571 I am concerned that if the sporadic security lockdown (passlock) occurs while driving, fuel is cut off from the running engine, speed/steering/braking will be minimized, and the possibility of a crash is increased exponentially. Please advise GM there needs to be a fix for this and ensure they comply! thank you for your time. I believe my photos of the blower motor fan resistor being burnt helped get GM issue a recall, and I hope this will urge them to fix as well

- Indiana, PA, USA

problem #34

Jun 202018


  • 180,000 miles
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

- Port Saint Lucie, FL, USA

problem #33

May 052017

H3 5-cyl

  • miles
2007 Hummer H3. Consumer writes seeking reimbursement for repairs done prior to safety recall being issued.

- Peoria, AZ, USA

problem #32

Feb 202018


  • 136,000 miles
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.

- Lakeland, FL, USA

problem #31

Jul 142017


  • 36,000 miles


About 2 years after I bougth car from dealer, the car cranks but wont start you have to wait 20 minutes and it starts today it left me stranded over 60 miles away, it has being doing this every few months, I saw a forum with hundreds of people having same problem and dealer says it doesent find anything that's what I was told two times at dealer, from the forum it seems to be a faulty passlock security problem or a faulty egnition switch on several years of Hummer, GM needs to recall this because is causing lots of expenses to a lot of people including

- Hialeah, FL, USA

problem #30

Dec 032013


  • 22,000 miles
Everything from: Electrical, air condition, stabilitrack system, which cost me over $600 still not working properly. Leakingsun roof censors, I was made to pay for that still dont work. I paid over $8,000, or more. When ever I brought my vechicle in, I was forced to for something else, my vechile only had about $22,000 miles. I was taking it to GMC/vera Cadillac 300 pembroke pines, fl 33025, ph:(954)362-9465, service manager Mr. Gustavo, edwin montoya. I have over 50 pages documents about fake repairs, my vechicle is wrost off now than before. It also has safty issues, mold/medw, ac overheating, airbag not working, etc. I am afraid for my safty.

- Hialeah, FL, USA

problem #29

Sep 102010


  • 7,000 miles
The contact owns a 2007 Hummer H3. While the vehicle was parked, the key became stuck in the ignition and could not be removed. The vehicle was towed to a dealer where it was diagnosed that the ignition cylinder failed and needed to be replaced. The dealer made many attempts to repair the vehicle, but the remedy failed. In addition, various electrical functions failed and a burning odor was noticed. The manufacturer was notified of the failure. The failure mileage was 7,000.

- Steamwood, IL, USA

problem #28

May 312016


  • 140,000 miles
My Hummer stalls and dies at various times. This is dangerous and know one can seem to tell me why it dies while driving. I take great care of my truck and me I have metal shavings in oil. Dying in an intersection with children is dangerous. This needs to be addressed.

- Southaven, MS, USA

problem #27

Apr 092016


  • 103,306 miles
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.

- Southfield, MI, USA

problem #26

Feb 252016


  • 110,488 miles
Bought 2007 Hummer H3 at the end of February as is in Chicago at net motor cars addison Illinois for 14000 and drove it home 150 miles away and was told by dealer to take it in to GM dealer and have my ABS system flashed by them and all warning lights will go away GM poages had my car for two weeks cost 560 dollars to repair then a day later check engine light came on took it to a shop and they said if GM had it checking for codes they should have seen the wire if they had it on machine looking for codes because that wire had to be in place to read the codes so he told me to take it back to them to repair it for free. I told him no for him to go ahead and fix it for a hundred because if I take it back to GM poage what other trick do they have up there sleve if they fix it. So he did and it showed multiple misfires and a steady misfire on cylinder 5 told them to fix it costing $1929.90 car has been in two different shops two weeks at the GM dealer poage auto mall in Decatur Illinois very disappointed on there behavior of being shady if they had it hooked up for two weeks on a code reader why didn't they see misfires. Will never do business with them ever they lost a 2000 dollar job and my future services like changing oil ect. This is bad business. Getting my car this week from South shores audo which will have my business in the future. GM or at least Decatur poages auto mall should be investigated by trying to screw over a woman and who else they can they pulled wire so I would bring back to get radio replaced as I was because I only had so much money to replace I think when I was going to bring back in for a refurbished trade in radio they were going to install it then hook wire back up and surprise me with the misfires and a probably 3000 dollar job. Also South shores auto told me nothing wrong with radio

- Decatur, IL, USA

problem #25

Nov 122014


  • miles
First the entire computer system stopped working. Had to replace thr PCM. Then my blower started throwing hot air when on cold. Had to install separate to resolve that issue. Had to re-build the transmission twice due to leak of coolant into the transmission. This truck has been a nightmare so far.

- Richmond, TX, USA

problem #24

Mar 012014

H3 4WD 5-cyl

  • Automatic transmission
  • 74,000 miles
The contact owns a 2007 Hummer H3. The contact stated that the engine was defective. The engine failed to start numerous times intermittently. The engine started after waiting ten minutes and the anti-theft light illuminated. The vehicle was not diagnosed nor repaired. The manufacturer was notified. The VIN was unknown. The failure mileage was 74,000. Updated 04/22/16

- Moore, SC, USA

problem #23

Feb 052016


  • 120,000 miles
The radiator has a crack in it which is a very common issue...needs to be recalled. My H3 was idling rough and would shut off. Had to replace throttle body and solenoid. The anti-theft acts up and the H3 won't start have to wait 10 minutes. The ac blower and connector burnt paid for it to get fixed then the recall comes out 7 days later....still haven't been refunded for that. I have all the issues on my 2007 H3 that should all be recalled and fixed at GM expense. Sunroof drains get clogged all the time and have water leak onto the floor which makes the ABS light trigger on and off. Issue after issue which GM doesn't take any responsibility for. It looks like it's time to sell the Hummer H3!!

- Tallahassee, FL, USA

problem #22

Dec 012014


  • 94,000 miles
Rebuilt transmission twice cleaned throttle body replaced exhaust manifold two O2 sensors replaced the radiator the heater core a fuel pump relay and this engine light still will not turn off it says torque converter clutch solenoid I'm disgusted already GM fix ur [xxx]. information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).

- Houston, TX, USA

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