Mack MD Problems by year

issues through Western Truck Center, at West Sacramento an authorized Mack Trucks dealership. Unfortunately, despite our efforts, the problems have not been satisfactorily addressed, and we have been unable to obtain a clear resolution. We are extremely concerned about the potential risk this presents to our drivers and other motorists. A commercial truck operating with a defective air brake system could pose a serious danger on public highways. We are requesting that NHTSA investigate this potential safety defect and determine whether corrective action is necessary to prevent a potentially catastrophic accident.

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.

8/20/24 - the truck lost breaks - @ 11:14am, we called Dave/Mangino's @ 11:21am Let him know that we are done with the truck - it's not safe and that the dealer needs to figure out what to do next. 8/22/24 - Dropped truck off at Mangino's for the "Buy Back" per Dave Grossbeck. Also turned in the licenses plates. Waiting to hear from Dave for exact amount of check. 8/23/24 - Dave Grossbeck - told us he still does not have any answers from GM It's going to take some time. 8/26/24 - we went to Mangino's and met with Dave Grossbeck & Mike Coffey to call GM Customer Service together. Asked to speak with a supervisor. Was told they would have a call back within 24-48 hours. Have not heard back to date (8/30/24). Dave Grossbeck called GM Upper Management and was told they were having a meeting on Wednesday (8/28/24) regarding the truck. 8/26/24 - we contacted Gus (GM Engineer) regarding the truck - Guys replied that he was coming out on Wednesday (8/28/24) to evaluate the truck. 8/28/24 - Gus came to Mangino's - we heard nothing from anyone. 8/29/24 - we stopped in at Mangino's Dave Grossbeck had no new answers. 8/30/24 - Dave Grossbeck returned a call from us. Dave requested our GM claim #. 9/9/24 we received a payment for the truck in full minus interest and deal fees for the buy back. A week later the truck was on the dealers lot for sale. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)