Mack Mru — Electrical
High risk
Apr 19, 2017
Model years: 2011, 2012, 2013, 2014, 2015, 2016, 2017
Certain vehicles may have been built with an incorrectly sized alternator cable. This could potentially result in the cable overheating, which may increase the risk of a vehicle fi
Also affects: Mack Leu, Mack Lr
Mack Mru — Powertrain
High risk
Oct 11, 2016
Model years: 2012, 2013, 2014, 2015, 2016
On certain vehicles, the cap nut that retains the interaxle driveshaft yoke to the rear axle input shaft may prematurely loosen. If the nut were to loosen and come off, the yoke co
Also affects: Mack Chu, Mack Cxu, Mack Gu, Mack Leu, Mack Lr
Mack Mru — Powertrain
High risk
Feb 18, 2016
Model years: 2012, 2013, 2014, 2015
On certain vehicles, the cap nut that retains the interaxle driveshaft yoke to the rear axle input shaft may prematurely loosen. If the nut were to loosen and come off, the yoke co
Also affects: Mack Cxu, Mack Chu, Mack Gu, Mack Leu, Mack Td
Mack Mru — Steering
High risk
Feb 18, 2016
Model years: 2016, 2017
On certain vehicles, the roll pin may not have been installed on the upper yoke on the steering shaft during assembly. If the roll pin is missing, the steering shaft may disconnect
Also affects: Mack Gu
Mack Mru — Engine
High risk
Oct 23, 2015
Model years: 2012, 2013, 2014, 2015, 2016
On certain vehicles equipped with natural gas powered engines, the turbocharger oil supply line may make contact with or interfere with one or more of the following: the turbocharg
Also affects: Mack Leu
Mack Mru — Engine
High risk
Jul 31, 2015
Model years: 2011, 2012, 2013, 2014, 2015, 2016
On certain vehicles equipped with Cummins Westport ISL-G engines, excessive engine crankcase pressure could cause the vent tube assembly elbow to detach from the breather. This cou
Also affects: Mack Leu
Mack Mru — Lights And Instruments
High risk
Apr 22, 2014
Model years: 2010, 2011, 2012, 2013, 2014
On certain vehicles, the directional/hazard signal flasher may fail. Actuation of the turn signal or hazard lights in this condition would cause them to remain illuminated and not
Also affects: Mack Chu, Mack Ct, Mack Cxu, Mack Gu, Mack Leu
Mack Mru — Engine
High risk
Mar 24, 2014
Model years: 2011, 2012, 2013, 2014, 2015
On certain vehicles equipped with Cummins compressed natural gas engines, incorrect engine ECU programming could cause the exhaust system temperature to become elevated during cold
Also affects: Mack Cxu, Mack Leu
Mack Mru — Powertrain
High risk
Oct 7, 2013
Model years: 2013, 2014
On certain vehicles, spindle nuts may have been installed incorrectly and could loosen, possibly resulting in the hub, wheel and tire assembly separating from the vehicle. This cou
Also affects: Mack Gu, Mack Cxu, Mack Chu, Mack Leu
Mack Mru — Brakes
High risk
May 10, 2013
Model years: 2013, 2014
On certain trucks, the cotter pin which retains the brake slack adjuster’s clevis pin may have been omitted during vehicle assembly. As a result, the clevis pin could loosen and fa
Also affects: Mack Chu, Mack Cxu, Mack Gu, Mack Leu
Mack Mru — Wheels
High risk
Oct 11, 2012
Model years: 2013
On certain vehicles, the wheel rims may have been manufactured incorrectly and could fail. A wheel separating from the vehicle could cause a loss of control and a crash. In additio
Also affects: Mack Chu, Mack Cxu, Mack Gu, Mack Leu
Mack Mru — Suspension
High risk
Feb 20, 2012
Model years: 2009, 2010, 2011
On certain trucks, the front axle beam may have been manufactured incorrectly. In certain application the load on the axle could allow stress cracks to form which, over time, may c
Also affects: Mack Leu
Mack Mru — Steering
High risk
Jul 21, 2011
Model years: 2009, 2010, 2011, 2012
On certain trucks, the steering gear mounting bolts may not have received adequate tightening torque during vehicle assembly. Should the bolts loosen, the steering gear could separ
Mack Mru — Powertrain
High risk
May 19, 2011
Model years: 2012
On certain trucks, the driveshaft may not have been welded correctly during the manufacturing process. This could allow the driveshaft to fracture along the length of the tube seam
Also affects: Mack Gu, Mack Chu, Mack Cxu, Mack Leu, Mack Td
Mack Mru — Brakes
High risk
May 2, 2011
Model years: 2011, 2012
On certain vehicles, the slack adjuster housings may have been manufactured incorrectly, which could allow the housings to fracture and fail. As a result, the wheel brake to which
Also affects: Mack Chu, Mack Cxu, Mack Gu, Mack Leu
Mack Mru — Electrical
High risk
Apr 1, 2011
Model years: 2008, 2009, 2010, 2011, 2012
On certain vehicles, the rearview mirror switch (mounted on the dashboard) may overheat, causing the plastic to melt. An overheated switch may not allow rearview mirror remote adju
Also affects: Mack Leu
Mack Mru — Lights And Instruments
High risk
Oct 10, 2007
Model years: 2008
On certain trucks, the Daytime Running Light (DRL) module may overheat and cause a vehicle fire. Correction: Dealers will replace the DRL module.
Also affects: Mack Chu, Mack Cxu, Mack Gu, Mack Leu
Mack Mru — Brakes
High risk
Aug 14, 2007
Model years: 2008
On certain school and transit buses, the Parker single check valve (SCV) that connects with the supply port of the Bendix SR-7 spring brake modulating valve may become excessively
Also affects: Mack Chn, Mack Chu, Mack Ctp, Mack Cv, Mack Cxn