2018 Mack Granite (Gu) problems, complaints & recalls
Most-reported problem areas: Suspension (1)
Safety recalls (4)
Tires 2024-10-18 · campaign 24V773000 · 49 vehicles
Defect: Mack Trucks, Inc. (Mack) is recalling certain 2019-2025 GR and 2018 GU Granite vehicles equipped with non-DOT tested tires. The tires may not have been DOT tested and confirmed to be sufficient for the vehicles. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 119, "New Pneumatic Tires - Other Than Passenger Cars."
Risk: Insufficient tires can fail, increasing the risk of a crash.
Fix: Dealers will inspect and replace the tires as necessary, free of charge. Owner notification letters were mailed November 6, 2024. Owners may contact Mack customer service at 1-800-866-1177. Mack's number for this recall is SC0471.
Exterior Lighting:turn Signal 2023-08-25 · campaign 23V600000 · 27,418 vehicles
Defect: Mack Trucks, Inc. (Mack) is recalling certain 2015-2023 GU and GR vehicles. The turn signals may be positioned incorrectly, reducing their visibility. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 108, "Lamps, Reflective Devices, and Associated Equipment."
Risk: Low turn signal visibility may not alert other drivers to a turning vehicle, increasing the risk of a crash.
Fix: Dealers will add additional turn signal lighting, free of charge. Owner letters were mailed September 25, 2024. Owners may contact Mack's customer service at 1-800-866-1177. Mack's number for this recall is SC0448.
Electronic Stability Control (Esc):control Module:software 2021-04-01 · campaign 21V233000 · 557 vehicles
Defect: Mack Trucks, Inc. (Mack) is recalling certain 2018-2022 Anthem (AN), Granite (GR/GU), and Pinnacle (CHU/CXU/PI) vehicles equipped with "camelback" rear suspension and electronic stability control. The vehicles may not stay in their lane at certain speeds. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 136, "Electronic Stability Control Systems on Heavy Vehicles."
Risk: A vehicle that drifts out of its lane increases the risk of a crash.
Fix: Mack will notify owners, and dealers will reprogram the vehicle control units, free of charge. The recall began on April 21, 2021. Owners may contact Mack customer service at 1-800-866-1177. Mack's number for this recall is SC0423.
Interior Lighting 2018-03-06 · campaign 18V152000 · 135 vehicles
Defect: Mack Trucks, Inc. (Mack) is recalling certain 2018 Anthem (AN), Granite (GU), and Pinnacle (CXU, PI) trucks. An electrical overload condition may cause the light control module (LCM) to fail, resulting in the loss of the exterior lighting, interior dashboard lighting, and the windshield wipers.
Risk: Loss of lighting or windshield wiper function can increase the risk of a crash.
Fix: Mack will notify owners, and dealers will replace and reprogram the LCM, free of charge. The recall began on March 23, 2018. Owners may contact Mack customer service at 1-800-866-1177. Mack's number for this recall is SC0409.
Service bulletins (178)
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.
Electrical System 2026-08-10 · CBR 159 202608 · Service Bulletin/Repair Instructions
mack trucks equipped with a cummins engine - engine preheat icon does not illuminate in the instrument cluster (ic) during engine pre-heat (intake air heater) operation - vehicles with 2018instrument cluster update, model year2018 and newer
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)).
Showing the 6 most recent of 178 bulletins. Search all of them free at nhtsa.gov.
What owners report
2020-11-05 · Suspension · 250,000 mi“the "u"bolts that attach the drive axles to the suspension appear to be faulty. we've had two break on two spate occasions in less than a week. both times the truck was loaded with approximately 79000 lbs, we don't run over weight, and driving. first time was left rear drive axle and the second was on the right side of the forward drive axle. when …”
Excerpts of consumer complaints filed with NHTSA, lightly truncated. They are owner statements, not verified findings.