- The problem
- 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."
- The risk
- Driving without a functioning anti-lock brake system may result in the trailer not braking as intended, increasing the risk of a crash.
- The fix
- 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.
Vehicle safety record
2012 Mack Mru Problems, complaints & recalls
No owner complaints about the 2012 Mack Mru have been filed with NHTSA. It is covered by 9 recalls, the latest in January 2025 for the antilock.
NHTSA data checked
FFar more problems than a typical Mru year, for its age
- Complaints
- 0
- Recalls
- 9
- Crashes
- 0
- Fires
- 0
- Injuries
- 0
- Deaths
- 0
2012 Mack Mru recalls 9
Recall repairs are free. Your dealer fixes them whether or not you bought the car there - check your VIN at nhtsa.gov/recalls to see if yours is done. What to do
- The problem
- 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.
- The risk
- If engine oil comes into contact with a hot surface, there could be an increased risk of a fire.
- The fix
- 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.
- The problem
- 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.
- The risk
- A failure of the hazard warning lights could reduce the trucks visibility, increasing the risk of a crash.
- The fix
- 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.
- The problem
- 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.
- The 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.
- The fix
- 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.
- The problem
- 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.
- The risk
- In the event of an electrical short, a vehicle fire may result.
- The fix
- 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.
- The problem
- 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.
- The risk
- A complete loss of steering may occur increasing the risk of a vehicle crash.
- The fix
- 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.
- The problem
- 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.
- The 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.
- The fix
- 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.
- The problem
- 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.
- The risk
- Slack adjusters with this flow notch could crack under normal braking conditions causing loss of braking which could result in a vehicle crash.
- The fix
- 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.
- The problem
- 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.
- The 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.
- The fix
- 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.
What owners say
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No complaints about the 2012 Mack Mru yet
No owner has filed a complaint about this vehicle with NHTSA. If yours has a problem, share it here and report it to NHTSA.
Mack Mru: every year compared
All Mru yearsQuestions about the 2012 Mack Mru
Does the 2012 Mack Mru have any recalls?
Yes - NHTSA lists 9 recalls for the 2012 Mack Mru: antilock (January 2025); engine (May 2015); flasher unit (April 2014); engine (March 2014) and more. Recall repairs are free at any authorized dealer. Enter your VIN at nhtsa.gov/recalls to see whether yours has been fixed.
How many complaints has the 2012 Mack Mru had?
None have been filed with NHTSA so far.
Is the 2012 Mack Mru a reliable vehicle?
Its Safety Index is 9 out of 100 (grade F: far more problems than a typical Mack Mru year, for its age). The index weighs complaints, crashes, fires, injuries, deaths and recalls against how long the vehicle has been on the road, compared with the same model's other years. It is not a measure of every repair - read the complaints and owner experiences, and have any used vehicle inspected before you buy.
What should I do if my 2012 Mack Mru has a problem?
If it is a safety problem, stop driving it if it is unsafe and contact your dealer. Report it to NHTSA at nhtsa.gov/report-a-safety-problem - enough reports start investigations and recalls - and share your experience here so other owners know what to look for.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) complaints and recalls, checked . Complaints are owners' own reports and are not verified. How we use the data