COMPONENTS THAT FAILED: Multiple systems failed in a connected chain. (1) The DPF aftertreatment differential pressure sensor — a CONFIRMED manufacturing defect per Cummins recall T7186/T7187 (Jan 2026). (2) The Allison automatic transmission — catastrophic internal failure: torque converter destroyed, flexplate warped and cracked, metal fragments throughout. (3) The transmission control unit wiring (circuits 143/123) reversed at the factory. The DEF sensor in the same aftertreatment system also failed back in Dec 2023, 14 months before the DPF symptoms — proving a system-wide defect. All failed components and repair invoices are available for inspection upon request. SAFETY RISK: After the dealer declared repairs complete, the truck was driven under 10 miles when the engine entered SEVERE DERATE (limp) mode WITHOUT WARNING, with four alerts firing at once including aftertreatment and transmission failures. Sudden, drastic power loss on a heavy commercial truck in live traffic is extremely dangerous — it can leave the vehicle unable to maintain highway speed, risking a collision with surrounding vehicles. The dealer released the truck in this hazardous state with no warning. CONFIRMED BY MULTIPLE SHOPS: Yes. The problem was reproduced and confirmed repeatedly — by the authorized dealer, by an independent transmission shop, and at final repair. The fault returned within 30 minutes on one visit and within 10 miles on another. INSPECTED BY: The authorized dealer and an independent service center inspected the vehicle and failed components. Documentation is available. WARNING SIGNS: Yes. Warning lamps appeared from the very first visit in Feb 2025 — transmission code P071A and high soot codes 1981/1922. They persisted for NINE MONTHS without proper repair, until the transmission catastrophically failed in Nov 2025. The vehicle was out of service over 45 days.
The worst 2023 Mack MD problems
Ranked by number of owner complaints. Mileage and cost come from what owners wrote.
- Engine1
- Fuel system1
- Transmission1
Problems by type
Tap a problem to see which part fails, at what mileage and in which other years.
- Engine1
- Fuel system1
- Transmission1
Recalls 2
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
Engine and engine cooling: engine: engine control module (ecu/ECM)
- What is wrong
- Mack Trucks, Inc. (Mack) is recalling certain 2023 MD6/7 trucks. The engine control module (ECM) may experience an internal short-circuit, which can result in an unexpected engine shut down.
- Risk
- An unexpected engine shut down can increase the risk of a crash.
- Remedy
- Cummins will replace the ECM, free of charge. Owner notification letters were mailed on September 27, 2022. Owners may contact Mack's customer service at 1‑800‑866‑1177. Mack's number for this recall is SC0438.
Recall number 22V606000 · Recall details
Technical service bulletins for the 2023 Mack MD 70
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
What 2023 Mack MD owners say
Most recent owner complaints, unedited.
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Questions about the 2023 Mack MD
Is the 2023 Mack MD reliable?
Owners have filed 1 complaint about the 2023 Mack MD, close to a typical MD model year.
What is the most common problem with the 2023 Mack MD?
Engine and cooling, with 1 complaint. Next is fuel system (1).
How many recalls does the 2023 Mack MD have?
2 recalls, covering seat belts and engine and engine cooling.
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