Problems · by component

2006 Hummer H3 engine and engine cooling problems

35 owner complaints to NHTSA about the 2006 Hummer H3 cite engine and engine cooling, 10% of all 362 complaints for this model year.

Complaints
35
10% of all complaints
Crashes
0
Reported by owners
Fires
0
Reported by owners
Injuries
0
Reported by owners
01 —Owner reports

What owners say about the engine and engine cooling

Verbatim from NHTSA complaints, newest first
“The contact owns a 2006 Hummer H3. The contact stated that the frame was rusted on the driver's side. The check engine warning light was illuminated. The contact looked underneath the vehicle and was able to see through the subframe. The contact also noticed cracks in sub frame. The contact was concerned about driving the vehicle. The vehicle was taken to an independent mechanic who determined there was an issue with the temperature sensor. While receiving an oil change, it was determined that the subframe was rusted. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was contacted and confirmed that there was no recall coverage for the failure. The failure mileage was approximately 130,000.”
Owner complaint to NHTSAFiled Jan 14, 2026Structure, Engine and engine coolingODI 11710957
“2006 HUMMER H3. CONSUMER WRITES IN REGARDS TO REPAIRS TO VEHICLE RADIATOR OVERHEATING PROBLEMS AND SEEKS REIMBURSEMENT FOR RECALL NOTICE 15042. *SMD THE CONSUMER STATED THE RADIATOR, THERMOSTAT AND WATER PUMP, WERE REPLACED ON MORE THAN ONE OCCASION. *JB”
Owner complaint to NHTSAFiled Apr 26, 2016Engine and engine cooling, VisibilityODI 10861806
“2006 HUMMER H3. CONSUMER WRITES IN REGARDS TO VEHICLE AIR CONDITIONING SYSTEM DEFECT. *SMD GM ACKNOWLEDGED THERE WAS A DEFECT WITH THE AC AND A RECALL WAS ISSUED. HOWEVER, THE PARTS WERE NOT AVAILABLE. ALSO, THE ENGINE LIGHT ILLUMINATED. THE THERMOSTAT AND SENSOR WERE REPLACED. *JB”
Owner complaint to NHTSAFiled Aug 17, 2015Engine and engine cooling, VisibilityODI 10748418
“THE OIL HAS BEEN CHANGED BUT I WILL DRIVE IT 10 TO 15 MILES AND STOP. THE OIL LIGHT AND THE DINGER COME ON. I RESET THE BUTTON AND THEN COME TO THE NEXT STOP AND THE LIGHT COMES ON AND THE DINGER GOES OFF. THE ONLY WAY IT STOPS IS SHUTTING OFF VEHICLE AND LET IT SET OVERNIGHT. I CHECK THE OIL WHEN IT DOES THIS AND THE DIP STICK IS FINE. IS THIS AN OIL SENSOR PROBLEM AND IS THIS UNDER WARRANTY OR A RECALL? *TR”
Owner complaint to NHTSAFiled Sep 6, 2014Engine and engine coolingODI 10631240
“DROVE CAR THRU CAR WASH .PULLED ONTO HIGHWAY LIGHT CAME ON ,LOSS OF POWER, POWER FAILURE .CAR WOULD NOT GO MORE THAN 2 MILES A HOUR .PUSHED THE GAS PEDAL TO THE FLOOR STILL NO POWER.IM CONCERNED THAT IF THIS HAPPENED WITH MY GRANDCHILD IN CAR ON HWY THIS COULD BE A MAJOR PROBLEM .PLEASE LOOK INTO THIS PROBLEM [XXX] *TR”
Owner complaint to NHTSAFiled Aug 1, 2014Engine and engine coolingODI 10618246
“ENGINE LIGHT CAME ON DURING EMISSION TESTING, WHICH CAUSED THE VEHICLE TO FAIL. JUST HAD THE THERMOSTAT AND EVAPORATOR VALVE REPLACED THE WEEK BEFORE. THE EMISSIONS DEPARTMENT STATED THAT IT WAS A CODE P0300, MISFIRE IN CYLINDER 1. I TOOK THE VEHICLE FOR DIAGNOSTICS AND AFTER A COIL TEST AND COMPRESSION TEST (FAILED), THEY STATED THAT IS WAS A CYLINDER VALVE LEAKAGE. THEY ALSO STATED THAT THERE WAS A BULLETIN OUT ON 2006 H3 FOR THIS ISSUE. WHEN I CONTACTED GM CUSTOMER SERVICE, I WAS TOLD THAT THE VEHICLE'S VIN WAS NOT A PART OF THIS BULLETIN AND THAT THE MILEAGE WAS PAST THE WARRANTY. THE ONLY THING THEY COULD SUGGEST TO ME IS TO TAKE IT TO A GM CERTIFIED REPAIR FACILITY AND I WOULD HAVE TO PAY FOR THE COMPLETE REPAIR MYSELF. *TR”
Owner complaint to NHTSAFiled Apr 24, 2012Engine and engine coolingODI 10456313

Showing 6 of 35 reports. Read every report on NHTSA.gov.

Data from NHTSA Complaints API (owner reports, unverified) · synced Nov 10, 2026NHTSA vehicle page

Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.