Check Engine Light On


pretty bad
Typical Repair Cost:
No data
Average Mileage:
108,000 miles
Total Complaints:
3 complaints

Most Common Solutions:

  1. not sure (3 reports)
2007 Hummer H3 engine problems

engine problem

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2007 Hummer H3 Owner Comments

problem #3

Aug 122019

H3 3.2L

  • Automatic transmission
  • 138,000 miles


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check engine light on check engine light on check engine light on

Purchased vehicle in Morgantown WV for my 16 year old. Dealership knew this. We live 50 Plus miles from there mechanic. Had it towed home twice now.

Vehicle overheated while parked for 2mins and with a/c on while getting kid from school. A few days later check engine light comes on for 2 days...then goes off. Then comes back on a week later. Now it hesitates and no power climbing hills. Had it coded and came back random misfire code 0300 and Evap code 0451. Said could be gas cap or bad gas. So I filled up w good ole Exxon gas and tried a new gas cap. Didnt help at all.

2007 H3 and this happened after driving it 250 miles after purchase. They are being tough and not allowing me to take it to a closer dealer and their warranty states that I can. Haven't driven it since.

NOW my other car, a 2007 Denali..AGAIN GM! Had its check engine light come on and then go off and today began flashing and completely stopped working on the interstate. No brakes. No steering, no.control at all. NO MORE GMs AGAIN. Family member almost died driving it to the dealer to get it looked at. Ridiculous.

- Toni G., Clarksburg, WV, US

problem #2

Dec 072017

H3 LX 3.7L V5

  • Automatic transmission
  • 131,000 miles

After it warms up CHECK ENGINE LIGHT and LOW OIL WARNING LIGHT comes on when I come to a stop and am idling, if stopped for more than a minute TEMP STARTS TO RISE RAPIDLY...... There are several mechanical issues.....Random Cylinder Misfires ( VALVE SPRINGS? OR POSSIBLE BAD HEAD)/ Overheating (PLASTIC RADIATOR) / Low Oil Pressure at low idle( SENSOR OR ??).......... How many more complaints does there have to be for a CLASS ACTION SUIT????

And Any Parts / Repairs For These Trucks Are Not Cheap!!

- Michael R., Las Vegas, US

problem #1

Jan 012013

H3 3.2L

  • Automatic transmission
  • 55,000 miles

H3 Hummer 2007 check engine light comes on stays on, approx. 55,000 miles

- Michael H., Bay City, TX, US

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