2007 Hummer H3 Transmission and drivetrain Problems
- Complaints
- 19about this part
- Share
- 8%of 238 total for the year
- Median mileage
- 70,693miles
- Trend
- FallingComplaints filed in the last 3 full calendar years are at least 25% lower than in the 3 years before.
NHTSA recorded 19 complaints about the transmission and drivetrain of the 2007 Hummer H3, 8% of the 238 complaints for this model year. Where a mileage was given, the median is 70,693 miles.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“Less than 1 year ago, I had the radiator and transmission replaced in my vehicle. I have recently noticed the smell of antifreeze coming from my hood after long trips. The radiator that was installed in my vehicle 10 months and 8k miles ago has developed a crack in the top tank. There is dried coolant spray across the top of my engine and a crack forming right behind the lip of the frame of the truck.”
NHTSA complaint #10585322, filed 2014-04, 85,000 miles“My radiator tank cracked right across the top compromising my cooling system. This turned into a bigger problem as the transmission oil cooler was not operating correctly and eventually destroying my transmission. I had to spend over $2k to have a refurbished tranny and new radiator installed.”
NHTSA complaint #10585321, filed 2014-04, 70,000 miles“My vehicle has a cracked radiator and according to other Hummer owners this is a common defect that happens to these vehicles. His over heating cuased me to pull over on a busy highway were I could of been hit and killed, total failer of vehicle electronics, gmc does not want to work on the vehicle that is not under warranty, because of the many problems wth this vehicle. This crack is were it is wearing near the motor.”
NHTSA complaint #10626232, filed 2014-08, 57,534 miles“I own a 2007 Hummer H3 with 66000 miles on it. It has been diagnosed as having a bad head due to the use of soft metals for the cylinder sleeve. Due to this, there is sudden reduced power. The cost of this fix is about $4500.00. My truck began with a check engine light on (autozone) said it was a misfire on cylinder #5. I went to the local dealer and asked them to look at the truck. They diagnosed it as a #5 cylinder having the compression leak of 90%. …”
NHTSA complaint #10578151, filed 2014-04, 66,000 miles“Had purchased vehicle 3 days prior from individual. Drove to el paso tx1 approximately 80 miles drove around town doing errands. Transmission started slipping badly, I pulled into a wal-mart and went to check the transmission fluid. Vehicle had a compression type dipstick. When I touched the lever on the dipstick it shot up approximately 8 inches and showered my right hand with very hot transmission fluid. This caused second degree burns to the palm and fingers, this made a trip to the emergency room necessary. …”
NHTSA complaint #10534376, filed 2013-08, 84,278 milesRelated service bulletins
- 11009088Sep 16, 2024This service bulletin provides information on some vehicles that may rock or move slightly forward or rearward while in Park at start up after cold soak. This condition may be…
- 11001321May 16, 2024This bulletin provides information on the harmful effects of water or ethylene glycol in transmission fluid.
- 11000119Apr 26, 2024This service bulletin provides technicians with information to help identify the differences between what is considered a fluid leak, and what is considered fluid seepage.
- 10249579Jan 12, 2024This PI bulletin advises the technician on the proper way to install the pistons in an engine.
- 10245395Nov 6, 2023This service bulletin provides a vibration analysis worksheet the technician can use in conjunction with the appropriate Vibration Analysis-Road testing procedure when diagnosing…
- 10242061Aug 7, 2023This service bulletin provides technicians with updated information to help identify the differences between what is considered a fluid leak, and what is considered fluid seepage.
- 10237387May 30, 2023This service bulletin provides information on some vehicles that may rock or move slightly forward or rearward while in Park at start up after cold soak. This condition may be…
- 10237659May 15, 2023This Preliminary Information communication provides information to the technician about vehicles that have an intermittent no crank, no start, or start stall concern with the…
- 10234619Apr 6, 2023This bulletin provides information on the harmful effects of water or ethylene glycol in transmission fluid.
- 10222777Sep 16, 2022This service bulletin provides technicians with updated information to help identify the differences between what is considered a fluid leak, and what is considered fluid seepage.
Transmission and drivetrain: other model years
Other parts of the 2007 Hummer H3
76 complaintsEngine
44 complaintsVisibility (wipers, defrost, mirrors)
42 complaintsOther or unknown
26 complaintsBody and structure
22 complaintsAir bags
19 complaintsEngine cooling
13 complaintsElectronic stability control
12 complaintsFuel system
12 complaintsBrakes
11 complaintsEquipment
8 complaintsSuspension
6 complaints
← All problems reported for the 2007 Hummer H3
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology