2009 Mack GU, 2008–2009 Mack Leu, 2008–2009 Mack Mru Recall: Control box may lose its electrical ground
NHTSA campaign 12V519000 · Electrical System · filed Oct 18, 2012 · verified Jul 30, 2026
The defect
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.
The risk
If the control box loses ground, it may have localized overheating. This could lead to a vehicle fire.
Check whether your specific vehicle is affected
Recall campaigns often cover only certain VIN ranges. Enter your VIN on the official NHTSA site to confirm whether your vehicle is included and whether the repair is still open.
Check VIN on NHTSA →The fix — what to do
All affected vehicles were sold to one customer that has already been notified. An official owner notification letter will be mailed to the one customer in early November 2012. Mack will replace the suspect control box on the affected vehicles, free of charge. Owners may contact Mack Trucks at 1-800-866-1177.
Mack's recall number is SC0366.Customers may contact the National Highway Traffic Safety Administration's Vehicle Safety Hotline at 1-888-327-4236 (TTY: 1-800-424-9153); or go to http://www.safercar.gov.
Affected vehicles
Related recalls
More Mack GU recalls
Other campaigns involving Mack vehicles
Source: NHTSA recall database, campaign 12V519000 (manufacturer number SC0366). Data last verified Jul 30, 2026.