Mack Granite (Gu) warranty claim denied?

If your dealer recently denied a warranty claim on your Mack Granite (GU), it helps to know the full picture before accepting that answer as final. Manufacturers are required to file service bulletins and owner notifications with NHTSA, and for this model there are 391 such documents on record — including four formal warranty extensions covering the Fuel Control Module (U111) and Pre-SCR NOx Sensor (U112, U113), as well as the EGR Cooler (U114). Other documented issues on file include an emissions recall for SCR replacement, a service campaign addressing hood insulation, a technical bulletin on clutch/flywheel housing oil leaks and burning smells, and a common-rail fuel system electrical fault bulletin covering 2017–2024 model years.

A denial letter doesn't always reflect every piece of documentation available about your vehicle's known issues. Dealers sometimes deny claims that, when supported with the right manufacturer records and service history, are eligible for reconsideration. ClaimRight reviews your denial alongside the manufacturer's own filings to see whether a documented defect applies to your situation, and explains what options may be available. A free assessment carries no obligation and costs nothing unless we help recover value on your behalf.