I have a 2011 GMC 2500 HD and the night before Thanksgiving the truck completely shut down. It's only 'heads up' was that the CHANGE FUEL FILTER alert and engine light came on about 1/4 of a mile before quitting. The truck has ~132,000 miles on it. At ~111,000 miles, the entire DEF system had to be replaced and at that time, a "100,000 mile service" was performed. This work was done at a local dealership. With this recent break down, the service department has informed me that the injector pump went bad and when this occurs, metal shavings are showered throughout the entire system. Result: a VERY COSTLY repair. Has anyone heard of a similar problem and if so, is the repair that difficult/expensive? TIA for any information, advice or horror stories.