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In TSB 08328 issued on Sept. 23, GM explained that the 4.2-liter inline-six on some 2009 Chevrolet TrailBlazers and GMC Envoys could have cylinder bores ground too deep during their manufacture, leading to cracked engine blocks. Thankfully, only about 800 vehicles are said to be involved. Affected vehicles will require a complete engine replacement.
The Times notes another TSB, number 07076 issued on Sept. 30, which involves corrosion in the fuel-tank modular reservoir. The reservoir houses the vehicle’s fuel pump, and the corrosion could lead to fuel spraying from the vehicle. Vehicles involved are the 2002-2004 Chevy TrailBlazer, GMC Envoy, and Oldsmobile Bravada and 2004 Buick Rainier and GMC Envoy X.U.V. GM is providing some help to owners of these vehicles, extending warranties from the original three years/36,000 miles up to 10 years or 120,000 miles, whichever comes first. Additionally, customers who have already paid for this repair have the option of being reimbursed by GM.--Colin Mathews