Vehicle having electrical issues, lights and radio shutting off and exhaust engine break working intermittently. Hooked up and mostly data link codes. Ic cluster lights flash on and off while hooked up. Found engine ecm full of oil on both a and b connectors. Oil level sensor is leaking wic king oil up to ecm. Will need ecm,harness,oil level, oil pressure sensors and egr venturi front cab mounts are wore causing air cleaner heat sheild to rub thought valve cover. Need to repair engine before anymore t/s.
Engine & cooling
Mack GU Engine problems by year
2 complaints filed with NHTSA about the Mack GU's engine & cooling. Stalling, loss of power, oil consumption, overheating, head gaskets, timing chains and engine failure.
Engine complaints by model year
Latest GU engine complaints
Tl* the contact owns a 2010 mack truck gu712. The driver was traveling 30 mph and attempted to decelerate when the vehicle suddenly accelerated. The driver was able to apply the brakes and maintain control of the vehicle. The engine rpms increased 12000-17000, and continued to increase when the engine was shut off. The certified mechanic inspected the truck and replaced the throttle. The vehicle was repaired. The manufacturer was not made aware of the failure. The failure and current mileage was 9,015. Updated...
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05/12/14*lj the consumer stated while in operation, the unit was abnormally hard to maintain. When he proceeded from a stop, the throttle was above idle. The consumer was informed the throttle was defective.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) complaints and recalls, checked daily. Complaints are owners' own reports and are not verified. How we use the data