Safety defect investigations, technical specifications, and manufacturer repair notices for Canadian owners.
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Safety recall notices and repair campaigns registered for the 2026 Mack Pioneer in Canada.
On certain trucks, the wheel nut(s) could loosen and cause the wheel(s) to detach.
A wheel separation could cause a loss of control and increase the risk of a crash. Additionally, a wheel that separates could create a road hazard for others.
To reduce the safety risk, Mack advises you not to drive your truck until the recall repairs have been completed. Mack will notify owners by mail and advise you to contact a dealership to arrange for an inspection of the wheels and hubs. Any damaged parts will be replaced.
On certain trucks, the connector(s) for the rear brake modulator(s) may not have proper wiring protection. As a result, the rear brake modulator(s) could short circuit and cause a loss of antilock braking system (ABS) and electronic stability control (ESC).
A loss of ABS and ESC could increase the risk of a crash.
Mack will notify owners by mail and advise you to take your truck to a dealership to inspect and, if necessary, replace the rear brake modulator(s). The dealer will also install a cover on the connector(s).
On certain trucks, a software problem could cause the trailer turn signal lights not to work when towing. Note: This problem would cause an error message to display on the instrument panel.
Turn signals that don't work may cause a person not to recognize when a driver intends to turn or change lanes and could increase the risk of a crash.
To reduce the safety risk, Mack advises you to test the trailer turn signals before driving, until the recall repairs are completed. Mack will notify owners by mail and advise you to take your truck to a dealership to update the vehicle software.
On certain trucks, the automatic high beams may not switch to low beams automatically. As a result, the trucks may not meet certain requirements of Canadian regulations.
High beams that stay on could cause glare for oncoming drivers and increase the risk of a crash.
To reduce the safety risk, Mack recommends you switch manually between the low beams and high beams until the recall repairs have been completed. Mack will notify owners by mail and advise you to take your vehicle to a dealership to update the vehicle software.
On certain trucks, the load lock clamps installed behind the cab could fail. As a result, the load lock bars could become loose and separate from the truck.
A load lock bar that separates could create road hazard for others and increase the risk of a crash or injury.
Mack will notify owners by mail and advise you to take your truck to a dealership to replace the load lock clamps.
Official Transport Canada safety campaigns, Canadian motor vehicle safety compliance standards and live VIN specifications.
Explore safety recall records by model year.