CHECK ENGINE LIGHT CAME ON THREE TIMES WITHIN THE FIRST MONTH AND A HALF I OWNED THE USED 04 TRAILBLAZER. IT SEEMS COMMON FROM WHAT MOST PEOPLE POSTED ON THE INTERNET THAT THIS PROBLEM OCCURS ANYWHERE FROM 35 - 55K MILES. THE GAS TANK WOULD CONSTANTLY RELEASE AN ODOR AND I WOULD GET DIZZY EVERY TIME I DROVE THE TRUCK. I TOOK IT IN TO THE DEALER AND THEY SAID IT WAS JUST A LEAK IN THE GAS CAP AND THAT IT NEEDED TO BE REPLACED. ONCE THE WARRANTY EXPIRED (ONE WEEK LATER), THE S.E..LIGHT CAME ON AGAIN AND THE DEALER SERVICE DEPARTMENT STATED THAT THERE WAS A CRACK IN THE NECK OF THE TANK AND THAT IT NEEDED TO BE REPLACED. I PICKED IT UP TODAY AFTER IT WAS REPLACED AND TOTALED TO $1,430. GM KNOWS ABOUT THIS PROBLEM AND HOPEFULLY THE LETTER THAT I HAVE WRITTEN TO THEM WILL SOLVE THIS ISSUE AND THAT I WILL EITHER BE REIMBURSED OR COMPENSATED SOMEHOW FOR LOST WORK AND INTEREST PAID ON THIS BILL. *TR