Mack Mru recalls

What is wrong

Mack Trucks, Inc. (Mack) is recalling certain 2010-2018 MRU and 2019-2025 Terrapro towing vehicles. The vehicles are missing the anti-lock brake (ABS) warning light and circuitry that controls the anti-lock brake function for an attached trailer. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 121, "Air Brake Systems."

Risk

Driving without a functioning anti-lock brake system may result in the trailer not braking as intended, increasing the risk of a crash.

Remedy

Dealers will add an ABS warning light and circuitry, free of charge. Owner notification letters were mailed April 28, 2025. Owners may contact Mack's customer service at 1‑800‑866‑1177. Mack's number for this recall is SC0474.

Recall number 25V030000 · Recall details

What is wrong

Mack Trucks, Inc. (Mack) is recalling certain 2008-2019 TerraPro (MRU) and 2019-2022 TerraPro (TE) vehicles. A brake control valve air leak into the attached exhaust hose can create excessive back pressure, causing the parking brake to release unexpectedly.

Risk

The unexpected release of the parking brake may allow the vehicle to rollaway, increasing the risk of a crash.

Remedy

Dealers will remove the exhaust tube and fitting from the valve, free of charge. Owner notification letters were mailed February 8, 2022. Owners may contact Mack customer service at 1‑800‑866‑1177. Mack's number for this recall is SC0433.

Recall number 21V953000 · Recall details

What is wrong

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.

Recall number 15V275000 · Recall details

What is wrong

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.

Recall number 14V208000 · Recall details

What is wrong

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.

Recall number 14V137000 · Recall details

What is wrong

Mack Trucks, Inc. (Mack) is recalling certain model year 2014 CXU and MRU trucks manufactured August 12, 2013, through October 9, 2013 and equipped with IMMI-brand L9 seat belt buckles. When the button is pressed to release the seat belt, the latch plate can become partially engaged with the buckle, making the seat belt difficult to unlatch. Thus, these vehicles fail to conform to the requirements of Federal Motor Vehicle Safety Standard (FMVSS) No. 209, "Seat Belt Assemblies."

Risk

If the latch plate remains partially engaged after the button is pressed, egress from the vehicle could be hindered which would increase the risk of injury in the event of an emergency.

Remedy

Mack will notify owners, and dealers will inspect the seat belt buckle, and if necessary, replace the seat belt buckles, free of charge. The recall began on January 30, 2014. Owners may contact Mack Trucks at 1‑336‑393‑2000. This is Mack Recall No. SC0373.

Recall number 13V619000 · Recall details

What is wrong

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.

Recall number 13V492000 · Recall details

What is wrong

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.

Recall number 13V195000 · Recall details

What is wrong

Mack Trucks is recalling certain model year 2008-2009 GU, LEU, and MRU trucks, manufactured from December 12, 2007, through May 8, 2008 and equipped with a certain focal mounted retarder control box. The control box may lose its electrical ground.

Risk

If the control box loses ground, it may have localized overheating. This could lead to a vehicle fire.

Remedy

All affected vehicles were sold to one customer that has already been notified. An official owner notification letter will be mailed to the one customer in early November 2012. Mack will replace the suspect control box on the affected vehicles, free of charge. Owners may contact Mack Trucks at 1‑800‑866‑1177.

Recall number 12V519000 · Recall details

What is wrong

Mack is recalling certain model year 2010-2012 leu and model year 2011-2012 mru vehicles, manufactured from may 14, 2009, through october 31, 2011, and built to operate on compressed natural gas. On these vehicles the alternator ground cable runs directly to the starter, which defeats the circuit protection.

Risk

In the event of an electrical short, a vehicle fire may result.

Remedy

Mack will notify owners, and dealers will relocate the alternator ground cable to the engine ground stud. This service will be performed free of charge. The recall began on april 19, 2012. Owners may contact mack trucks at 1‑800‑866‑1177.

Recall number 12V096000 · Recall details

What is wrong

Mack is recalling certain model year 2009-2011 mru and model year 2010-2011 leu vehicles, manufactured from january 1, 2009, through september 30, 2010 because the front axle may crack and fracture.

Risk

Complete fractures can cause the driver to lose control of the vehicle, increasing the risk of a crash.

Remedy

Mack will notify owners, and replace the axle beams on affected vehicles when sufficient quantities are available. As an interim measure, a mag particle inspection will be provided to mitigate risk and identify vehicles with cracked axle beams. This service will be performed free of charge. The safety recall began march 30, 2012. Owners may contact mack trucks at 1‑800‑866‑1177.

Recall number 12V067000 · Recall details

What is wrong

Mack trucks is recalling certain model year 2009-2012 mru heavy trucks manufactured from november 26, 2008, through april 26, 2011. The bolts used to mount the steering gear were not tightened to specification. The bolts can loosen which over time may cause the steering gear to disconnect from its mounting bracket.

Risk

A complete loss of steering may occur increasing the risk of a vehicle crash.

Remedy

Dealers will replace the bolts, which will be tightened to the correct specification. This service will be performed free of charge. The safety recall began on september 19, 2011. Owners may contact mack trucks at 1‑800‑866‑1177.

Recall number 11V374000 · Recall details

What is wrong

Mack trucks is recalling certain model year 2012, chu, cxu, gu, mru, leu, and td trucks equipped with a meritor driveline. The tubing used to assemble the affected drivelines has a nonconforming seam weld with insufficient bonding of the material.

Risk

This can result in seam weld fracture when torque is applied. Once the tube seam weld is fractured, the driveline may become inoperable which may result in a disabled vehicle or debris from the driveline may fall on the roadway, both of which can increase the risk of a crash.

Remedy

Dealers will replace the drivelines free of charge. The safety recall began on july 25, 2011. Owners may contact mack trucks at 1‑800‑528‑6586.

Recall number 11V295000 · Recall details

What is wrong

Mack trucks is recalling certain model year 2011-2012 chu, cxu, gu, leu and mru trucks manufactured from october 15, 2010, through january 31, 2011, and equipped with gunite automatic slack adjusters. Due to an incomplete "knitting" of the iron at the time of casting, inadequate structural integrity of the slack adjuster housing can occur, which could cause the housing to break at the handle under normal operating loads.

Risk

Slack adjusters with this flow notch could crack under normal braking conditions causing loss of braking which could result in a vehicle crash.

Remedy

Mack trucks will notify owners and dealers will replace the subject slack adjusters free of charge. The safety recall began on august 24, 2011. Owners may contact mack trucks at 1‑800‑528‑6586.

Recall number 11V272000 · Recall details

What is wrong

Mack trucks is recalling certain model year 2008-2012 mru and leu heavy trucks manufactured from january 3, 2007, through february 3, 2011. The electrical circuitry in these vehicles may not provide adequate overcurrent protection.

Risk

In the event of an electrical overage, the fuse that should prevent the over current from reaching the mirror switch circuit may fail, such that the mirror switch can overheat. An overheated switch could cause a vehicle fire.

Remedy

Dealers will install a relay harness to prevent the mirror switch from overheating. They will also inspect the mirror switch and if signs of overheating are shown, replace that switch. All inspections and repairs will be performed free of charge. The safety recall began on june 30, 2011. Owners may contact mack trucks at 1‑800‑866‑1177.

Recall number 11V212000 · Recall details

What is wrong

Mack is recalling certain model year 2008 through 2011 gu and mru model vehicles manufactured with a front tow glad hand option. The actuation and release timing of the vehicles exceeds the limit which fails to conform to the requirements of federal motor vehicle safety standard no. 121, "air brake systems."

Risk

If the brakes do not perform as they should, a vehicle crash could occur.

Remedy

Mack will notify owners and repair the vehicle free of charge. The safety recall began on february 1, 2011. Owners may contact mack at 1‑877‑800‑4945.

Recall number 10V404000 · Recall details

What is wrong

Mack is recalling 338 model year 2009 mru and leu heavy duty trucks manufactured from august 20 through november 26, 2008 equipped with certain haldex quick release valves (qrv). The rubber diaphragm inside the qrv may experience delamination resulting in significant levels of air pressure leakage past and/or through the diaphragm, or the development of a bubble in the diaphragm which may trap air pressure in the valve and not allow the service brakes to release.

Risk

Malfunction of the air brake system could result in a vehicle crash.

Remedy

Mack will notify owners and repair the affected vehicle free of charge. The safety recall is expected to begin on or about july 13, 2009. Owners can contact mack toll-free at 1‑800‑866‑1177.

Recall number 09V194000 · Recall details

What is wrong

On certain trucks, the daytime running lights (drl) module may contain a suspect metal-oxide-semiconductor field effect transistor (mosfet) that could overheat.

Risk

If the transistor overheats, it could possibly result in a vehicle fire.

Remedy

Dealers will replace the suspect drl module free of charge. The recall began on october 31, 2007. Owners may contact mack trucks at 1‑800‑528‑6586.

Recall number 07V478000 · Recall details