Common problems of the 2009 to 2012 Chevy Duramax include failure of diesel exhaust tank heaters, faulty instrument cluster, failure of the transmission limp mode, water pump failure and overheating. Other problems include breakdown of the exhaust brake, poor fuel economy and poor interior design.
A defective thermostat, worn-out blower fan or leaks in the cooling system can cause the diesel exhaust tank heaters to freeze in extremely cold environments. A worn-out ignition switch, blown fuse, faulty sensor or bad connection between the gauge cluster and the main wiring harness can result in failure of the instrument panel.
A defective computer in the 2011 Duramax, faulty brake light switch and worn-out mass air flow sensor in the car can cause the transmission to slip in high gear and suddenly drop to third gear. A contamination in the cooling system, seal leakage, bearing overload or excessive vibration can result in water pump failure. A faulty fan clutch, clogged radiator or defective water pump can cause the 2010 Chevy Duramax to overheat.
A faulty oxygen sensor, inaccurate coolant sensor and a defective engine thermostat can lead to poor fuel economy in a 2012 Chevy Duramax. Additionally, leaks in the exhaust gas recirculation, worn-out spark plugs, a dirty fuel injector and a clogged converter can result in poor fuel economy. A manufacturer’s defect in the 2011 Chevy Duramax accounts for the car’s cheap plastic interior.