Vehicle Safety Data

2012 MACK MRU — Problems, Recalls & Safety Data

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N/A

Safety Rating

0

Owner Complaints

9

Recalls

ACTIVE RECALL

5

Service Bulletins

0

Investigations

Overview of the 2012 MACK MRU

The 2012 MACK MRU has received a total of 0 safety complaints filed with the National Highway Traffic Safety Administration (NHTSA). There have been 9 recall campaigns affecting this vehicle, covering issues with SERVICE BRAKES, AIR:ANTILOCK, ENGINE AND ENGINE COOLING:ENGINE, EXTERIOR LIGHTING:TURN SIGNAL:FLASHER UNIT. 5 technical service bulletins have been issued by MACK TRUCKS, INC for this model year.

Recalls for the 2012 MACK MRU

NHTSA has recorded 9 recalls for the 2012 MACK MRU, potentially affecting up to 56,730 vehicles.

Recall 25V030000 — SERVICE BRAKES, AIR:ANTILOCK

| 142 vehicles affected

Defect: 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."

Consequence: 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.

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Recall 15V275000 — ENGINE AND ENGINE COOLING:ENGINE

| 2,124 vehicles affected

Defect: 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...

Consequence: 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...

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Recall 14V208000 — EXTERIOR LIGHTING:TURN SIGNAL:FLASHER UNIT

| 44,047 vehicles affected

Defect: 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.

Consequence: 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...

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Recall 14V137000 — ENGINE AND ENGINE COOLING:ENGINE

| 1,934 vehicles affected

Defect: 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.

Consequence: 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...

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Recall 12V096000 — ELECTRICAL SYSTEM:ALTERNATOR/GENERATOR/REGULATOR

| 318 vehicles affected

Defect: 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.

Consequence: 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.

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Recall 11V374000 — STEERING:GEAR BOX:SHAFT SECTOR

| 2,294 vehicles affected

Defect: 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.

Consequence: 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.

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Recall 11V272000 — SERVICE BRAKES, AIR:SLACK ADJUSTERS:AUTOMATIC

| 1,524 vehicles affected

Defect: 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...

Consequence: 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.

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Recall 11V295000 — POWER TRAIN:DRIVELINE

| 584 vehicles affected

Defect: 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.

Consequence: 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.

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Recall 11V212000 — ELECTRICAL SYSTEM

| 3,763 vehicles affected

Defect: 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.

Consequence: 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....

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Owner Complaints for the 2012 MACK MRU

No complaints have been filed with NHTSA for the 2012 MACK MRU.

Safety Rating for the 2012 MACK MRU

NHTSA has not yet tested the 2012 MACK MRU in its New Car Assessment Program.

Technical Service Bulletins for the 2012 MACK MRU

MACK TRUCKS, INC has issued 5 technical service bulletins (TSBs) for the 2012 MACK MRU. TSBs are notices sent by manufacturers to their dealers describing a known issue and the recommended repair procedure.

K95422063 — ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL

Mack Chassis - Diagnostic Trouble Code ( DTC ) P2459 Lighting The Malfunction Indicator Lamp ( MIL ); Possible Frequent Regeneration Requests - OBD15 And Newer Chassis

FSB-252-029 — ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:MANIFOLD/HEADER/MUFFLER/TAIL PIPE

MACK TRUCK: MUFFLER INLET PIPE WILL FALL OUT, AND A NEW MUFFLER INLET PIPE, TURBORCHARGER OUTLET PIPE, LENGTHENED EXHAUST FLEX PIPE WAS DESIGNED TO ADDRESS THIS CONDITION AND WORK TOGETHER TO REDUCE RIGIDITY. *PE

FSB 565-001 — SERVICE BRAKES, AIR

SOME MRU AND LEU TRUCKS BUILT BETWEEN 06/28/2010 AND 02/11/2013 WITH THE CUMMINS ISLG ENGINE MAY EXPERIENCE A FAILURE OF THE BRAKE COMPRESSOR AIR INLET HOSE WHERE IT ATTACHES TO THE COMPRESSOR.

FSB-565-001 — SERVICE BRAKES, AIR:SUPPLY:HOSES, LINES/PIPING, AND FITTINGS

MACK TRUCKS: ON SOME TRUCKS, WHERE ATTACHMENT TO COMPRESSOR, TRUCK MAY EXPERIENCE A FAILURE OF BRAKE COMPRESSOR AIR INLET HOSE AND NEED TO REPLACE BLACK RUBBER BRAKE COMPRESSOR INLET HOSE WITH NEW SILICONE HOSE AND CLAMPS. MODELS 2010-2013 LEU, MRU, CUMMINS ISL-G. *PE

FB-284-027 — ENGINE AND ENGINE COOLING:COOLING SYSTEM

MACK: THERE ARE ENGINE DIAGNOSTIC TROUBLE CODES AND THERE MAY NEED TO BE A SOFTWARE UPDATE. *RM

NHTSA Investigations for the 2012 MACK MRU

There are no NHTSA defect investigations on record for this vehicle.

Other Model Years of the MACK MRU

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Other MACK Models

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