Mack is recalling certain 2023 MD6/7 trucks because their engine control modules may short-circuit, causing unexpected engine shutdowns that could lead to crashes. Owners should contact Mack for free ECM replacements. Read more at govinfonow.com/recall/81474-mack-2023-md6-7-trucks-engine-shutdown-risk.
“Mack 2023 MD6/7 Trucks: Engine Shutdown Risk.” GovInfoNow, updated October 4, 2026. https://govinfonow.com/recall/81474-mack-2023-md6-7-trucks-engine-shutdown-risk. Based on NHTSA recall #22V606000 (https://www.nhtsa.gov/recalls?nhtsaId=22V606000).
Mack Trucks, Inc. recalled certain 2023 MD trucks after an engine control module short-circuit could cause an unexpected engine shutdown, increasing crash risk, according to the National Highway Traffic Safety Administration (NHTSA) on September 8, 2022. Owners will receive notification letters and can contact Mack customer service at 1-800-866-1177.
How to tell if you have it
Mack MD, 2023
What to do
Cummins will replace the engine control module free of charge. Owner notification letters were mailed on September 27, 2022. Owners may contact Mack's customer service at 1-800-866-1177.
The hazard
The engine control module may experience an internal short-circuit, which can result in an unexpected engine shut down. This condition increases the risk of a crash.
Context
GovInfoNow's records show Mack Trucks, Inc. has 74 other recalls on file since July 9, 2010. Recent similar recalls include a detached intake bezel hazard reported on October 1, 2026, and brake software issues affecting 2026-2027 Pioneer PR and Anthem AN trucks announced on September 28, 2026. Other recent recalls of similar products include an electrical system safety risk for International 2025 MV vehicles (November 25, 2025), a drive power loss crash risk for Ford 2026 F-350 SD trucks (March 3, 2026), and a loss of control risk for Ford 2026 F-150 trucks (September 9, 2026).
How to tell if you have this one
Check if your truck is a 2023 model with the MD6 or MD7 series. The recall was notified to owners starting September 27, 2022.
Brand
Mack
Category
Vehicle
Based on the official NHTSA remedy
What to do — step by step
Stop Using the Truck
If you experience unexpected engine shutdowns, stop driving immediately.
Contact Mack Customer Service
Call 1-800-866-1177 to schedule a free ECM replacement.
Official remedy
What NHTSA says to do
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.
How this recall unfolded
Recall timeline
Owners were mailed letters 19 days after NHTSA received the defect report.
1NHTSA received the defect report
2Owner letters mailed
Dates from the agency record only; steps without a date are left out.
Take action
Contact Mack
We’ve drafted a message you can send Mack to request your refund or repair — edit it as you like.
Subject: Recall 22V606000 — Mack 2023 MD6/7 Trucks: Engine Shutdown Risk
Hello,
I own a Mack 2023 MD6/7 Trucks: Engine Shutdown Risk that is covered by recall 22V606000 from Mack.
The official recall notice states: 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.
I’m writing to arrange the remedy described in the recall (a refund, repair, or replacement as applicable). Could you please tell me the next steps to resolve this?
Thank you.
The facts (hazard, remedy, dates, manufacturer) are pulled from the official NHTSA recall record. The plain-language summary and step-by-step checklist are written by GovInfoNow to make the official notice easier to act on — they don’t replace it.
Plain-language summary written by qwen3:4b on October 4, 2026, from the official record above. Not reviewed by a person — if it conflicts with the NHTSA notice, the notice is correct. Report an error on this page.
GovInfoNow is an independent service and is not a government agency. We republish official NHTSA recall data; we don’t issue, amend or administer recalls.