The driver was driving down the freeway and lost all power. The driveshaft fell out of the truck at 70 mph, luckly the truck was working a night shift and traffic was light, only a piece was still attached. The dealer confirmed rear differenial failure. There were no warnings before the failure.
The worst 2020 Mack Granite (GR) problems
Ranked by number of owner complaints. Mileage and cost come from what owners wrote.
- Transmission2
Problems by type
Tap a problem to see which part fails, at what mileage and in which other years.
- Transmission2
Recalls 7
Seat belts: front: anchorage
- What is wrong
- Mack Trucks, Inc. (Mack) is recalling certain 2020-2025 Mack MD, 2019-2025 Anthem, Granite, 2024 MD Electric, and 2025 Pinnacle trucks equipped with a passenger bench seat. The seat belt anchorage bracket may be improperly welded. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 210, "Seat Belt Assembly Anchorages."
- Risk
- An improperly welded seat belt anchorage bracket can detach during a crash, increasing the risk of injury.
- Remedy
- Dealers will install a reinforcement plate, free of charge. Owner letters were mailed January 21, 2026. Owners may contact Mack's customer service at 1‑800‑866‑1177. Mack's number for this recall is SC0485. Vehicle Identification Numbers (VINs) involved in this recall will be searchable on beginning October 13, 2025.
Recall number 25V666000 · Recall details
Electrical system: software
- What is wrong
- Mack Trucks, Inc. (Mack) is recalling certain 2020-2025 Anthem, Granite, TerraPro and Pinnacle vehicles, equipped with Bendix EC80 Advanced Electronic Control Units (ECU). Electrical noise and low signal to the power line carrier may cause the ECU to incorrectly process commands or stop working.
- Risk
- Safety systems that depend on the ECU (Automatic Traction Control, ABS, Electronic Stability Control, Active Cruise Control, and Collison Mitigation System) may have diminished or lost functionality, increasing the risk of a crash.
- Remedy
- Dealers will reprogram the ECU software, free of charge. Owner notification letters were mailed December 9, 2024. Owners may contact Mack customer service at 1‑800‑866‑1177. Mack's number for this recall is SC0472.
Recall number 24V792000 · Recall details
Tires
- What is wrong
- 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.
- Remedy
- 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.
Recall number 24V773000 · Recall details
Exterior lighting: turn signal
- What is wrong
- 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.
- Remedy
- 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.
Recall number 23V600000 · Recall details
Electronic stability control (ESC): control module: software
- What is wrong
- 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.
- Remedy
- 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.
Recall number 21V233000 · Recall details
Steering: linkages: drag: link: connection
- What is wrong
- Mack Trucks, Inc. (Mack) is recalling certain 2020 Anthem (AN), Granite (GR), and Pinnacle (PI) vehicles. The castle nuts and cotter pins used to connect the steering drag link to the pitman arm and steering arm may have not been correctly installed, potentially causing separation of the drag link.
- Risk
- If the drag link separates, loss of steering control my occur, increasing the risk of a crash.
- Remedy
- Mack will notify owners, and dealers will inspect the drag link attachment points, repairing them, as necessary, free of charge. The recall began January 14, 2020. Owners may contact Mack customer service at 1‑800‑866‑1177. Mack's number for this recall is SC0420.
Recall number 19V896000 · Recall details
Visibility: rearview mirrors/devices: exterior
- What is wrong
- Mack Trucks, Inc. (Mack) is recalling certain 2019-2020 Mack Anthem, Granite, Pinnacle vehicles. The passenger side door down view mirror may detach from the door.
- Risk
- If the mirror detaches from the door, the mirror may strike another vehicle or pedestrian, increasing the risk of injury or crash.
- Remedy
- Mack will notify owners, and dealers will properly attach the mirror, free of charge. The recall began March 19, 2019. Owners may contact Mack customer service at 1‑800‑866‑1177. Mack's number for this recall is SC0416.
Recall number 19V054000 · Recall details
Technical service bulletins for the 2020 Mack Granite (GR) 253
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
What 2020 Mack Granite (GR) owners say
Most recent owner complaints, unedited.
The driver was driving down an arterial street and the thru shaft failed on a blind corner. The driver was able to limp the truck to the shoulder. The drivers safety was put at risk as well as everyone else on the road, there would have been no way to move the trailer if it had been loaded and was blocking the road. The dealer was able to replace the thru shaft. The differential failed 7 months later and broke the drive shaft in half. Luckily the driver was able to get over to the shoulder and the pieces wedged between the crossmember and bottom of the truck so nothing was dropped onto the highway. The dealer performed the repairs under warranty. There was no warning before this happened.
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Questions about the 2020 Mack Granite (GR)
Is the 2020 Mack Granite (GR) reliable?
Owners have filed 2 complaints about the 2020 Mack Granite (GR), close to a typical Granite (GR) model year.
What is the most common problem with the 2020 Mack Granite (GR)?
Transmission and drivetrain, with 2 complaints.
How many recalls does the 2020 Mack Granite (GR) have?
7 recalls, covering seat belts, electrical system and tires.
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