Mack LR recalls

• Electrical#2024194March 27, 2024

  31 units affected

  Issue: On certain trucks, the fuse for the methane detection system may not have been installed during production. As a result, the methane detector may not work. Note: This recall only affects trucks equipped with a natural gas engine. Safety Risk: A methane detection system that doesn't work could increase the risk of fire or injury. Corrective Actions: Mack will notify owners by mail and advise you to take your truck to a dealership to install the methane detection system fuse.

• Electrical#2023630November 22, 2023

  70 units affected

  Issue: On certain trucks, the engine may not return to idle if the accelerator pedal position sensor becomes disconnected. As a result, the trucks don't meet certain requirements of Canadian regulations. Safety Risk: An engine that doesn't return to idle could cause a loss of control and increase the risk of a crash. Corrective Actions: Mack will notify owners by mail. The corrective actions for this recall are under development.

• Engine#2023588October 31, 2023

  10 units affected

  Issue: On a small number of trucks equipped with a Cummins L9N natural gas engine, when the engine is lifted, the rear lifting bracket attached to the cylinder head could detach. If this happens, the engine could swing or fall. Safety Risk: An engine that swings or falls could create a risk of injury. Corrective Actions: Cummins will notify owners by mail and advise you to take your truck to a Cummins authorized service center to inspect and, if necessary, replace the studs on the rear lifting bracket.

• Electrical#2023021January 24, 2023

  5 units affected

  Issue: On a small number of LR Electric models, a relay for the coolant heater could fail. If this happens, the heater could stay energized when there is no coolant flow or a low coolant level. Safety Risk: A coolant heater that stays energized could create the risk of a fire. Corrective Actions: Mack will notify owners by mail and instruct you to take your truck to a dealership to update the hybrid powertrain control unit and instrument cluster software. The dealer will also install replacement relays.

• Lights And Instruments#2022361June 15, 2022

  4,304 units affected

  Issue: On certain trucks, some controls are not identified with the required symbol(s) or word(s). Specifically, the identifications for the HVAC fan control, the position side marker light control, the master lighting switch control and the turn signal control may be missing or mislabeled. Canadian regulations require the use of certain symbols and words for controls. This can help to avoid driver confusion. Safety Risk: These small errors do not affect safety or the function of the controls. Corrective Actions: This is not a recall. Mack has made changes to ensure that the controls for all new trucks are identified with the required symbol(s) and word(s).

• Steering#2022295June 7, 2022

  258 units affected

  Issue: On certain trucks, the steering gear may not have been assembled correctly. As a result, the steering gear could break and cause a loss of steering. Safety Risk: A loss of steering control could create the risk of a crash. Corrective Actions: Mack will notify owners by mail and instruct you to take your truck to a dealership to inspect the serial number on the steering gear, and replace it, if necessary.

• Steering#2021248April 26, 2021

  4 units affected

  Issue: On a small number of trucks, the steering transfer case was not properly filled with oil. As a result, the bearings may fail and the steering could lock-up. Safety Risk: A loss of steering control could create the risk of a crash. Corrective Actions: Mack will notify owners by mail and instruct you to take your truck to a dealer to inspect, and if necessary, replace the steering transfer case. To reduce the safety risk, Mack recommends that you should avoid driving your truck until this recall is completed.

• Tires#2018641November 21, 2018

  73 units affected

  Certain trucks were equipped with Bridgestone M864, M860A or M854 wide-base tires, size 425/65R22.5, that may not conform to the endurance testing requirements of Canada Motor Vehicle Safety Standard (CMVSS) 119 - Tires for vehicles other than passenger cars. A manufacturing problem could cause a bulge or blister to be present in the sidewall of the tires. Over time, this could cause deterioration of the tire’s structure and lead to a sudden tire failure that may increase the risk of a crash causing property damage and/or personal injury. Correction: Dealers will inspect and replace affected tires as necessary.

• Electrical#2017216April 19, 2017

  40 units affected

  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 fire causing injury and/or damage to property. Correction: Dealers will replace the alternator cable.

• Powertrain#2016495October 11, 2016

  1,690 units affected

  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 could separate from the axle input shaft and cause the drive shaft to disconnect. A disconnected drive shaft would result in a loss of motive power, and create a road hazard, both of which could increase the risk of a crash causing injury and/or damage to property. Correction: Dealers will inspect the torque on the cap nut, and the nut will be replaced if the torque is found under specification. Note: This is an expansion of recall 2016-079.

Canadian data updated August 24, 2026