2018 Mack Mru problems, complaints & recalls
Most-reported problem areas: Wheels (1)
Safety recalls (1)
Service Brakes, Air:antilock 2025-01-23 · campaign 25V030000 · 142 vehicles
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."
Risk: Driving without a functioning anti-lock brake system may result in the trailer not braking as intended, increasing the risk of a crash.
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.
Service bulletins (276)
Technical service bulletins are repair instructions manufacturers send dealers for known issues. Unlike recalls, the fix is not automatically free — but naming the bulletin at the service desk can save diagnosis time and support goodwill repairs.
Power Train 2026-04-09 · CBR 2573-1 202604 · Service Bulletin/Repair Instructions
cbr - mack chassis - through shaft bearing retainer breakage on mack carriers.
Power Train 2026-04-09 · CBR 2362-3 202604 · Service Bulletin/Repair Instructions
cbr - mack carrier nut adhesive change.
Electrical System 2026-02-04 · CBR 126 022026 · Service Bulletin/Repair Instructions
cbr - the purpose of this solution is to give information on engine control module (ems) software content.
Vehicle Speed Control 2026-01-08 · CBR 820-9 202601 · Service Bulletin/Repair Instructions
cbr - mack chassis - engine brake only works with the brake pedal, no function during cruise. us07 and newer emissions, model year 2008 and newer.
Engine 2026-01-07 · CBR 2107-22 202601 · Service Bulletin/Repair Instructions
cbr - mack def level (uqls) sensor troubleshooting guide - us17+obd16 emissions to us22+obd2023 (does not apply to an(4) and pr(4)).
Steering 2025-08-01 · S4571 082025 · Service Campaign
fi - drag link and pitman arm replacement.
Showing the 6 most recent of 276 bulletins. Search all of them free at nhtsa.gov.
What owners report
2020-10-06 · Wheels · 40,000 mi“2018 mack gru with 40k has two cracked front wheels made by alcoa. we have 10 other trucks 2012 to 2019 with same wheels and no cracks. after little research on the internet it is obvious many other people are having this problem on buses, rvs, and trucks. strange we would have 2 on same truck and no others. it is easy to assume the aluminum alloy …”
Excerpts of consumer complaints filed with NHTSA, lightly truncated. They are owner statements, not verified findings.