2014 Mack LEU recalls

• 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.

• Powertrain#2016079February 18, 2016

  1,068 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 replace the cap nut, and inspect the threads on the input shaft. If the threads are damaged, the input shaft will be replaced.

• Engine#2015500October 23, 2015

  364 units affected

  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 turbocharger inlet elbow, the OEM clean air intake clamp, or the air fuel control tube. The resulting contact or interference may damage the turbocharger oil supply line, possibly resulting in an oil leak. Oil leaking onto hot engine surfaces could increase the risk of a fire, and could increase the risk of injury and/or property damage. Correction: Dealers will replace the oil line.

• Engine#2015348July 31, 2015

  258 units affected

  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 could allow engine oil to come in contact with hot surfaces, increasing the risk of fire resulting in injury and/or damage to property. Correction: Dealers will install clamps at both ends of the elbow of the breather tube assembly and reprogram the Electronic Control Module (ECM) to improve diagnostic capabilities.

• Engine#2014090March 24, 2014

  157 units affected

  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 weather operation. This could also cause flames to be emitted from the exhaust. As a result, nearby combustible material could be ignited, increasing the risk of a fire, injury and/or damage to property. Correction: Authorized Cummins service facilities will update software programming.

• Engine#2014052February 21, 2014

  123 units affected

  On certain vehicles equipped with Cummins ISL engine, the exhaust pipe may disconnect from the muffler/catalyst. If this occurs on a twin-steer configured vehicle where the vehicle is operated from the right side, the operator may be exposed to carbon monoxide, which could result in asphyxiation or carbon monoxide poisoning. Correction: Dealers will install a different length exhaust flex pipe and a turbocharger outlet pipe to reduce rigidity of the exhaust to address this condition.

• Powertrain#2013346October 7, 2013

  61 units affected

  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 could increase the risk of a crash causing injury and/or property damage. Also, should a wheel separate from the vehicle, it could pose a danger to nearby motorists or bystanders, which could result in injury and/or property damage. Correction: Dealers will inspect and repair vehicles as required.

• Brakes#2013161May 10, 2013

  906 units affected

  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 fall out, causing a loss of brake function at the affected wheel. This could cause the vehicle to pull to one side under braking, or increase stopping distance, which could result in a crash causing property damage and/or personal injury. Correction: Dealers will verify cotter pin installation on each brake slack adjuster. Replacement cotter pins and/or clevis pins will be installed as needed.

Canadian data updated August 24, 2026

• ENGINE AND ENGINE COOLING:ENGINE#15V275000May 11, 2015

  Mack Trucks, Inc. (Mack) is recalling certain model year 2011-2016 Mack MRU and LEU trucks manufactured June 25, 2010, to April 30, 2015, and 2015-2016 LR6 trucks manufactured from December 18, 2014 through March 6, 2015. Excessive engine crankcase pressures may cause the 90-degree elbow of the vent tube assembly to detach from the crankcase ventilation breather, possibly allowing engine oil to come into contact with hot surfaces.

  Risk: If engine oil comes into contact with a hot surface, there could be an increased risk of a fire.

  Remedy: Cummins will notify owners on behalf of Mack, and Cummins service centers will administer the repairs which include securing the ends of the 90-degree elbow and reprogramming the electronic control module (ECM) with software that can adjust the engine output under misfire conditions to limit crankcase pressures. These repairs will be performed free of charge. The recall began on June 12, 2015. Owners may contact Mack customer service at 1-800-528-6586 or Cummins Inc. at 1-800-343-7357. Mack's number for this recall is SC0391.

• EXTERIOR LIGHTING:TURN SIGNAL:FLASHER UNIT#14V208000April 18, 2014

  Mack Trucks Inc. (Mack) is recalling certain model year 2010-2014 CHU, CXU, and MRU, 2007 CT and CV, 2008-2014 GU, and 2011-2014 LEU, and TD trucks manufactured February 28, 2006, through November 8, 2013, and equipped Hamsar Electronic Flasher. The hazard warning lights may fail.

  Risk: A failure of the hazard warning lights could reduce the trucks visibility, increasing the risk of a crash.

  Remedy: Mack will notify owners, and dealers will replace the electronic flasher unit, free of charge. The recall will begin by mid-June 2014. Interim letters went out to owners on June 23, 2014. The recall began on July 25, 2014. Owners may contact Mack customer service at 1-866-298-6586. Mack's number for this recall is SC0379.

• ENGINE AND ENGINE COOLING:ENGINE#14V137000March 24, 2014

  Mack Trucks Inc. (Mack) is recalling certain model year 2014-2015 CXU, 2010-2015 LEU, and 2011-2015 MRU vehicles manufactured with certain Cummins Westport Model ISL G and ISX12 G engines. Condensation in the intake manifold may freeze during cold weather conditions and interfere with the proper operation of the intake manifold pressure sensor.

  Risk: The improper operation of the sensor could induce elevated exhaust temperatures or flames from the exhaust pipe, increasing the risk of a vehicle fire or burn injury to a person near the exhaust pipe.

  Remedy: Cummins and Cummins Westport will notify owners, and authorized Cummins service facilities will upload a new ECM calibration, free of charge. The recall began on March 12, 2014. Customers may contact Mack at 1-336-393-2000 or Cummins Inc. at 1-800-343-7357. Mack's number for this recall is SC0377.

• ENGINE AND ENGINE COOLING:EXHAUST SYSTEM#14V088000February 21, 2014

  Mack Trucks, Inc. (Mack) is recalling certain model year 2010-2015 LEU vehicles manufactured May 14, 2009, through February 14, 2014, and equipped with a Cummins ISL engine. In the affected vehicles, the exhaust pipe may disconnect from the muffler/catalyst.

  Risk: If the exhaust pipe separates from the muffler on a twin-steer configured vehicle where the vehicle is operated from the right side, the operator may be exposed to carbon monoxide levels which may cause personal injury.

  Remedy: Mack will notify owners. The recall began on April 21, 2014. The recall is expected to begin in late April 2014. Owners may contact Mack Trucks at 1-336-393-2000. Mack's number for this recall is SC0376.

• POWER TRAIN:AXLE HUBS#13V492000October 17, 2013

  Mack Trucks is recalling certain model year 2013-2014 CHU, CXU, GU, LEU, and MRU vehicles manufactured with pro-torque axle spindle nuts from August 28, 2012, through August 16, 2013. The pro-torque nut may not have been installed correctly, which may result in a loosening of the nut.

  Risk: If the nut comes loose, the hub assembly may separate from the vehicle, increasing the risk of a crash.

  Remedy: Mack Trucks will notify owners, and dealers will inspect and repair the vehicles, as necessary, free of charge. The recall began on November 12, 2013. Mack's recall number is SC0371. Owners may contact Mack Trucks at 1-336-393-2000.

• SERVICE BRAKES#13V195000May 13, 2013

  Mack Trucks, Inc. is recalling certain model year 2013-2014 CHU, CXU, GU, MRU, and LEU trucks manufactured July 16, 2012, through march 18, 2013 and equipped with drum brakes. The clevis pin for the brake slack adjuster may be missing a cotter pin. If the cotter pin is not installed, the clevis pin may loosen and fall out causing a loss of brake function on the affected wheel.

  Risk: A loss of brake function at one wheel will lead to increased stopping distances and pulling to the left or right when braking, which may increase the risk of a crash.

  Remedy: Mack Trucks, Inc. will notify owners, and dealers will inspect the brake slack adjusters and install the brake hardware, as necessary, free of charge. An interim was mailed to owners on June 20, 2013. A second notice was mailed to owners on September 30, 2013. Owners may contact Mack Trucks at 1-800-528-6586. Mack Trucks' recall campaign number is SC0370.