2006 Hummer H3 Q&A
2006 Hummer H3 Question: Steady engine light came on.
P0300 is a random missfire code. It usally does not mean a major repair but I do not know for sure with what little info here. I would get a second opinion at another shop. Best get recommendations from friends or neighbors of a reliable shop in your town. - milesauto
these motors i believe have valve issues that are covered under a dealer asst program for 7 yrs 70k miles.call anothe dealer and see if you fall into that group. have you vin# in hand when you call they will need it - globalhelper
You heard wrong...NO ONE is replacing a cylinder...and it will NOT cost five grand to replace a fuel injector. - your.mechanic
PROBLEMS WITH MOST EARLY H3 HUMMERS. GM NOT DOING A RECALL. IF THE LAST 6 NUMBERS OF YOUR VIN ARE LESS THA 287591 YOU HAVE A GOOD CHANCE OF HAVING A BAD HEAD INSTALLED AT THE FACTORY - TIGGER2007