Mack Trucks Inc. (Mack) is recalling certain model year 2010-2014 CHU, CXU, and MRU, 2007 CT and CV, 2008-2014 GU, and 2011-2014 LEU, and TD trucks manufactured February 28, 2006, through November 8, 2013, and equipped Hamsar Electronic Flasher. The hazard...
2007-2018 · 9 model years
Mack GU Problems by year
Owners have filed 6 complaints about the Mack GU across 9 model years, and it has 14 recalls. The 2009 has the most complaints once its age is allowed for (1), while 2013, 2015, 2018 have far fewer than a typical year. The most reported problem area is the engine & cooling, followed by the transmission & drivetrain.
- Complaints
- 6
- Recalls
- 14
- Crashes
- 1
- Fires
- 0
- Injuries
- 1
- Deaths
- 0
GU complaints by model year
Highlighted: the year with the most complaints for its age. Older vehicles have had more time to collect complaints - the Safety Index grade allows for that.
Most common GU problems
Mack GU recalls 14
Mack Trucks, Inc. (Mack) notified the agency on February 20, 2014, that they are recalling certain model year 2010-2012 CHU, CXU, GU and TD vehicles manufactured from June 16, 2009, through July 8, 2011. While continuing to research the scope of the issue...
Mack Trucks is recalling certain model year 2008-2009 GU, LEU, and MRU trucks, manufactured from December 12, 2007, through May 8, 2008 and equipped with a certain focal mounted retarder control box. The control box may lose its electrical ground.
Mack trucks is recalling certain model year 2008-2011 gu heavy trucks manufactured from september 12, 2007, through april 8, 2011, with a four battery cable design. As a result of the routing and clipping used, the battery cables may come into contact with...
Mack trucks is recalling certain model year 2011-2012 chu, cxu, gu, leu and mru trucks manufactured from october 15, 2010, through january 31, 2011, and equipped with gunite automatic slack adjusters. Due to an incomplete "knitting" of the iron at the time...
Mack is recalling certain model year 2008 through 2011 gu and mru model vehicles manufactured with a front tow glad hand option. The actuation and release timing of the vehicles exceeds the limit which fails to conform to the requirements of federal motor...
Mack is recalling certain my 2009 trucks equipped with hella headlamps for failing to comply with the photometric output requirements of federal motor vehicle safety standard no. 108, 'Lamps, reflective devices, and associated equipment." The headlamp's bulb...
Covers2009 Mack GU
Mack is recalling 66 my 2009 gu trucks equipped with bendix mv-3 dash control valves. The molded valve body has an incorrect core pin in the injection mold causing the valve body to be oversized in the double check valve area. This condition can allow the...
Covers2009 Mack GU
On certain trucks, the daytime running lights (drl) module may contain a suspect metal-oxide-semiconductor field effect transistor (mosfet) that could overheat.
On certain trucks equipped with parker single check valves (scv) provided by bendix. The defect exists in the parker scv that connects with the supply port of the sr-7 spring brake modulating valve. After prolonged use of the parker scv, the valve body...
On certain trucks equipped with bendix sr-7 spring brake modulating valves, the internal rubber check valve may leak causing a delay in the application of the spring brakes to park the vehicle after the operator pulls the dash valve button.
On certain trucks, the nut used to retain the steering shaft may or may not be a lock nut that has the locking feature. A lock nut is required to provide additional resistance to ensure that the nut does not come loose.
Latest GU complaints
Wipers do not work and the tractor lights turn off ALL of the lights the trailer lights go out as well the fuse for these electrical components gets very hot, this makes it very dangerous when driving at night and when it's raining. The driver has to pull over till he can get the lights to come back on
The drive shaft of this truck fell off on northbound i-95 while it was driving.*Dt*jb
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.
Tl* the contact owns a 2015 mack gu 713. The contact received notification for nhtsa campaign number: 16v099000 (power train). The part for the recall repair was unavailable. The contact stated that the manufacturer exceeded a reasonable amount of time for the recall repair. The contact had not experienced a failure. The manufacturer was made aware of the issue. Parts distribution disconnect.
Tl* the contact owns a 2013 mack gu713. The contact received notification of a manufacturer recall pertaining to the structure of the vehicle. The dealer was unable to schedule a repair within a reasonable time frame. The contact also made several attempts to reach the manufacturer to determine when the remedy and parts would become available. The nhtsa campaign number was not provided. The contact had not experienced a failure.
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...
Read the full complaint
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.
Questions about the Mack GU
Which Mack GU years have the most problems?
Which Mack GU years have the fewest complaints?
What are the most common Mack GU problems?
Across every model year, owners report problems with the engine & cooling (2), transmission & drivetrain (2), visibility & wipers (1) most often.
How many recalls does the Mack GU have?
NHTSA lists 14 recalls across all Mack GU model years. Each year's page lists the recalls for that year; check your own vehicle by VIN at nhtsa.gov/recalls to see whether the repair has been done.
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