Mack Gu — Lights And Instruments
High risk
Aug 25, 2023
Model years: 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023
Issue: On certain trucks, the front turn signals may not be visible from certain angles. As a result, the trucks don't meet the requirements of the Canadian regulations. Safety Ris
Also affects: Mack Granite
Mack Gu — Structure
High risk
Nov 12, 2020
Model years: 2018
On certain trucks, the welds that attach the trailer hitch may crack due to improper welding. As a result, the hitch could detach from the truck while towing a trailer.
Also affects: Freightliner 114sd, Freightliner Business Class M2, International Hv, International Hx, International Mv
Mack Gu — 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 Leu, Mack Lr, Mack Mru
Mack Gu — 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 Mru
Mack Gu — 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 Leu, Mack Td, Mack Mru
Mack Gu — Brakes
High risk
Aug 17, 2015
Model years: 2009, 2011, 2012, 2013, 2014, 2015, 2016
On certain vehicles, The chassis electrical harness and air brake lines may not have been properly secured at the crossmember. This could cause the electrical cables and air lines
Also affects: Mack Cxu, Mack Chu, Mack Td
Mack Gu — Brakes
High risk
Aug 17, 2015
Model years: 2011, 2016
Certain vehicles fail to comply with the requirements of Canada Motor Vehicle Safety Standard 121 - Air Brake Systems. These vehicles were built with insufficient air tank reserve
Mack Gu — Electrical
High risk
Jan 16, 2015
Model years: 2015
On certain model vehicles outfitted with an Automatic Over-Speed Protection system, the system may be incorrectly wired. This presents a potential risk as the operator may not be a
Also affects: Mack Chu, Mack Cxu
Mack Gu — Electrical
High risk
Nov 20, 2014
Model years: 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015
On certain model vehicles, water around the windshield can migrate into the Electronic Power Distribution Module and contaminate it. As a result, circuits may be bridged creating a
Also affects: Mack Chu, Mack Cxu, Mack Td
Mack Gu — Powertrain
High risk
Oct 7, 2014
Model years: 2015
On certain vehicles equipped with Cummins ISL engines, the fuel filter shell and nut plate could separate, causing a fuel leak and also causing the engine to stall. Stalling would
Mack Gu — Seats And Restraints
High risk
Sep 9, 2014
Model years: 2015
On certain vehicles, bolts securing the seat belts to the seat frame, cab wall and cab floor may have been insufficiently tightened during vehicle assembly. As a result, bolts coul
Also affects: Mack Chu, Mack Cxu
Mack Gu — Lights And Instruments
High risk
Apr 22, 2014
Model years: 2008, 2009, 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 Leu, Mack Mru
Mack Gu — Electrical
High risk
Feb 21, 2014
Model years: 2010, 2011, 2012
On certain model vehicles, water around the windshield can migrate into the Electronic Power Distribution Module and contaminate it. As a result, circuits may be bridged creating a
Also affects: Mack Chu, Mack Cxu, Mack Td
Mack Gu — Accessories
High risk
Dec 19, 2013
Model years: 2014
On certain model vehicles outfitted with an Automatic Over-Speed Protection system, the system may be incorrectly wired. This presents a potential risk in applications where the Po
Also affects: Mack Chu, Mack Cxu
Mack Gu — Steering
High risk
Oct 7, 2013
Model years: 2014
On certain vehicles, the tie rod end clamp bolts may not have been torqued to specification. As a result, the tie rod ends could separate from the tie rod, resulting in a loss of s
Also affects: Mack Cxu
Mack Gu — 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 Cxu, Mack Chu, Mack Leu, Mack Mru
Mack Gu — 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 Leu, Mack Mru
Mack Gu — 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 Leu, Mack Mru
Mack Gu — Visual System
High risk
Jun 29, 2012
Model years: 2012
On certain vehicles, the hardware used to affix the windshield wiper linkage to the wiper motor may have been subject to rust and corrosion before assembly. This contamination may
Also affects: Mack Chu, Mack Cxu
Mack Gu — Suspension
High risk
Nov 18, 2011
Model years: 2011, 2012
On certain trucks, the drive axle tower bracket may not have been welded correctly during the manufacturing process. This could allow the bracket to detach from the axle, which cou
Mack Gu — Other
High risk
Jul 21, 2011
Model years: 2010, 2011
On certain trucks, the clutch pedal assembly may have been manufactured incorrectly and could fail. This could allow the clutch pedal to fall to the floor, prohibiting clutch opera
Also affects: Mack Cxu, Mack Chu
Mack Gu — 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 Chu, Mack Cxu, Mack Leu, Mack Td, Mack Mru
Mack Gu — 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 Leu, Mack Mru
Mack Gu — Lights And Instruments
High risk
Aug 6, 2008
Model years: 2009
On certain tucks, the headlamp bulb shield may not be completely seated into the headlamp reflector. This could result in a non-compliance with the Motor vehicle Safety Standard fo
Mack Gu — Brakes
High risk
Apr 14, 2008
Model years: 2009
Certain vehicles may have been assembled with an incorrectly manufactured Bendix MV-3 dash control valve. If the double check valve becomes lodged, in the event of a primary reserv
Mack Gu — 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 Leu, Mack Mru
Mack Gu — Brakes
High risk
Aug 14, 2007
Model years: 2008
On certain vehicles, the internal rubber check valve inside the Bendix SR-7 spring brake modulating valve can become deformed over time. The effect of this defect is intermittent a
Also affects: Mack Cxn, Mack Cv, Mack Chn, Mack Ctp, Mack Mr
Mack Gu — 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
Mack Gu — Steering
High risk
Jul 24, 2007
Model years: 2008
On certain trucks, the locknut used to retain the steering shaft may not have had the lock feature. As a result, the nut could loosen, allowing the steering shaft to separate, caus
Also affects: Mack Chu
Mack Gu — Brakes
High risk
Mar 13, 2007
Model years: 2008
On certain trucks, the cotter pin that retains the brake pedal clevis pin may not have been installed. The clevis pin connects the brake pedal to the brake foot valve; therefore, i
Also affects: Mack Ctp
Mack Gu — Suspension
High risk
Feb 15, 2007
Model years: 2007
On certain trucks, the adjustable torque rod used on the Chalmers rear suspension may be brittle. This may lead to premature failure of the rod, which may result in a loss of contr
Also affects: Mack Ctp, Mack Ct, Mack Cl, Mack Cv
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