2015 Mack Mru Problems: 0 Complaints, 3 Recalls

The worst 2015 Mack Mru problems

Ranked by number of owner complaints. Mileage and cost come from what owners wrote.

Tap a problem to see which part fails, at what mileage and in which other years.

Service brakes, air: antilockReported January 23, 2025 · 142 vehicles affected

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

Engine and engine cooling: engineReported May 11, 2015 · 2,124 vehicles affected

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

Engine and engine cooling: engineReported March 24, 2014 · 1,934 vehicles affected

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

Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.

Used buying checklistWhat to check on a 2015 Mack Mru before you buy

Is the 2015 Mack Mru reliable?

Owners have filed 0 complaints about the 2015 Mack Mru.

What is the most common problem with the 2015 Mack Mru?

There are not enough complaints to tell.

How many recalls does the 2015 Mack Mru have?

3 recalls, covering service brakes, air and engine and engine cooling.

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