Background and Contracted Scope At the recommendation of Mountain West Service Manager Kendall Weaver, I contracted with Mountain West to install an engine-mounted PTO (Power Take-Off) hydraulic pump on Truck #37 for use in a side dump trailer application. Kendall represented that the engine-mounted system would be more powerful and better suited to the truck. A side dump trailer requires bidirectional hydraulic flow — controlled pressure in both directions to operate the dump body. The pump specified and contracted for was Volvo part #20392944, a premium piston-type hydraulic pump with an integrated clutch, allowing the pump to disengage from the engine when not in use. Day 1 of the installation — Mountain West Service Advisor Michael Korgenski emailed: "We are not able to install the pump because without the bypass valve the pump will continue to run dry and burn up. Body builder will need to install and plumb the pump and valve." The Mack dealer intentionally substituted the pump with an incorrect pump that creates constant hydraulic pressure. This incorrect pump has caused hydraulic lines to burst three times on the highway, dumping approximately 20 gallons of hydraulic fluid on the highway, the truck then begins smoking and overheating risking fire. The dealer instead of fixing the truck correctly insists on using the wrong spec parts and wants to build a work around, that they stated may or may not work.
The worst 2025 Mack Granite (GR) problems
Ranked by number of owner complaints. Mileage and cost come from what owners wrote.
- Electrical1
- Engine1
- Transmission1
Problems by type
Tap a problem to see which part fails, at what mileage and in which other years.
- Electrical1
- Engine1
- Transmission1
Recalls 8
Exterior lighting: headlights
- What is wrong
- Mack Trucks, Inc. (Mack) is recalling certain 2024-2025 Granite trucks equipped with LED headlights. The LED headlights may fail.
- Risk
- Loss of headlight illumination can reduce visibility, increasing the risk of a crash.
- Remedy
- Dealers will replace the LED headlights, free of charge. Owner letters were mailed July 23, 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 November 10, 2025.
Recall number 25V756000 · Recall details
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: 12v/24v/48v battery
- What is wrong
- Mack Trucks, Inc. (Mack) is recalling certain 2025 Anthem and Granite vehicles. The power cables may have been improperly routed, which can cause an electrical short.
- Risk
- An electrical short can cause an engine stall, increasing the risk of a crash. An electrical short can also cause the cables to overheat, increasing the risk of a fire.
- Remedy
- Dealers will re-route the power cables, free of charge. Owner notification letters were mailed June 16, 2025. Owners may contact Mack's customer service at 1‑800‑866‑1177. Mack's number for this recall is SC0480.
Recall number 25V382000 · Recall details
Service brakes, hydraulic: antilock/traction control/electronic limited slip: control unit/module
- 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
Seats: critical fasteners
- What is wrong
- Mack Trucks, Inc. (Mack) is recalling certain 2024-2025 Anthem, Granite, and Pinnacle vehicles equipped with RollTek driver's seat assemblies. The seat pedestal and seat belt attachment may have been improperly tightened.
- Risk
- An improperly tightened seat pedestal and seat belt attachment may not restrain the occupant as intended, increasing their risk of injury during a crash.
- Remedy
- Dealers will replace and tighten the seat pedestal and seat belt attachment bolts, free of charge. Owner notification letters were mailed September 16, 2024. Owners may contact Mack customer service at 1‑800‑866‑1177. Mack's number for this recall is SC0469.
Recall number 24V567000 · Recall details
Steering: linkages: tie rod assembly
- What is wrong
- Mack Trucks, Inc. (Mack) is recalling certain 2025 LR, Granite, and Pinnacle vehicles equipped with Composilite EXS20 steerable lift axle suspension assemblies. The tie rod assembly ball stud could have been improperly heat treated and can fail.
- Risk
- The ball stud can separate from the vehicle becoming a road hazard, increasing the risk of a crash.
- Remedy
- Dealers will inspect and replace the tie rod end assemblies as necessary, free of charge. Owner notification letters were mailed July 15, 2024. Owners may contact Mack customer service at 1‑800‑866‑1177. Mack's number for this recall is SC0468.
Recall number 24V504000 · Recall details
Steering: linkages: drag: link: connection
- What is wrong
- Mack Trucks, Inc. (Mack) is recalling certain 2025 Mack AN, GR, and TE trucks. The drag link may contain an improperly heat-treated ball stud that can fail, resulting in a sudden loss of steering control.
- Risk
- A sudden loss of steering control increases the risk of a crash.
- Remedy
- Owners are advised not to drive their vehicles until the remedy has been completed. Dealers will inspect and replace the drag links, as necessary, free of charge. Owner notification letters were mailed June 20, 2024. Owners may contact Mack customer service at 1‑800‑866‑1177. Mack's number for this recall is SC0465.
Recall number 24V398000 · Recall details
Technical service bulletins for the 2025 Mack Granite (GR) 64
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
- Certain AN, GR, and Pl model trucks could experience an issue with the clutch position sensor causing PTO...
- Parker engine-mounted hydraulic pump service bulletin.
- Mack Trucks Equipped With A Cummins Engine
- Cbr
- The purpose of this CBR is to provide steps on how to correct a customer complaint of DTC P107B86...
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What 2025 Mack Granite (GR) owners say
Most recent owner complaints, unedited.
Compare the 2025 Mack Granite (GR)
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Questions about the 2025 Mack Granite (GR)
Is the 2025 Mack Granite (GR) reliable?
Owners have filed 1 complaint about the 2025 Mack Granite (GR), fewer than a typical Granite (GR) model year.
What is the most common problem with the 2025 Mack Granite (GR)?
Electrical system, with 1 complaint. Next is engine (1).
How many recalls does the 2025 Mack Granite (GR) have?
8 recalls, covering exterior lighting, seat belts and electrical system.
Was there a recall on the 2025 Mack Granite (GR) electrical?
Yes, 1 recall: 25V382000. Check your VIN to see if your car still needs the free repair.
VIN decoder
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