Recall 22V606 affects 150 2023 Mack Md trucks for an engine control module short circuit. Free repair at a franchised Mack dealer once available.
Mack is recalling 150 2023 Md trucks because the engine control module can short-circuit internally and shut the engine down unexpectedly. An unexpected shutdown can raise crash risk, and the Mack dealer repair will be free once Mack makes it available.
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What's wrong?
The engine control module on 2023 Mack Md trucks is the truck's main engine computer. It reads sensor signals, controls fuel and engine operation, and keeps the Cummins engine running as commanded by the driver. The engine depends on that module to keep sending the right instructions while the truck is moving.
On affected trucks, the ECM was built with an internal manufacturing defect. During production, a screw in a soldering fixture moved out of position and pushed an electrolytic capacitor frame into the printed circuit board. That contact can create an internal short circuit inside the module. When the module shorts, the engine can shut down unexpectedly instead of continuing to run.
There is no warning sign before failure. An affected truck can be running normally, then lose engine power when the ECM shorts internally.
Who's affected?
| 2023 Mack Md | Engine control module (ecu/ecm) |
|---|---|
| Units affected | 150 |
| Field incidents | NHTSA has logged no field incidents to date. |
The year and model narrow the scope, but the VIN decides. Check your VIN to confirm whether your specific truck is included.
What's the safety risk?
An unexpected engine shutdown can increase the risk of a crash because the truck loses power while moving. There is no warning sign before failure, so check your VIN and call a Mack dealer for the current repair status. Repair will be free at any franchised Mack dealer once available.
What should I do?
- Check your VIN to confirm your 2023 Mack Md is included in this recall.
- Check for the Mack owner letter with instructions for the ECM short-circuit recall.
- Ask a franchised Mack dealer about the ECM replacement that fixes the short-circuit condition linked to unexpected engine shutdown.
- Call Mack customer service at 1-800-866-1177 with questions, and reference recall number 22V606 (Mack recall SC0438) when you call.
- Drive cautiously until Mack or the dealer confirms the repair path for your VIN; pull over safely if the engine shuts down.
What happens at the repair
At the dealer, a Mack technician will replace the engine control module, also called the ECM, once the final repair is available. The final dealer repair will be free once available. Out-of-pocket repairs already paid are handled through the manufacturer's limited warranty, not through a separate reimbursement program, because any product failure before the notice would have been covered under that warranty. Ask the service desk how warranty coverage applies if you have prior repair paperwork.
| Reimbursement | Warranty coverage applies |
|---|
Timeline
| August 9, 2022 | NHTSA published the recall |
|---|---|
| September 26, 2022 | VIN-searchable in NHTSA's database — Check your VIN to see whether this recall applies to your specific vehicle. |
| September 26, 2022 | Interim owner notification (was planned for this date) |
| September 27, 2022 | Owner notification mailed |
Frequently asked questions
What is recall 22V606?
Recall 22V606 covers 150 2023 Mack Md trucks with an engine control module that can short internally and shut the engine down unexpectedly. An engine shutdown while driving increases crash risk. Cummins will replace the ECM free of charge.
What should I do if my 2023 Mack Md is on this recall?
Check your VIN to confirm your specific truck is included in recall 22V606. If it is, contact a franchised Mack dealer or Mack customer service at 1-800-866-1177. Reference Mack recall number SC0438 and ask how the ECM replacement will be handled.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to provide the recall repair at no cost. For recall 22V606, Cummins will replace the engine control module free of charge, and a franchised Mack dealer can confirm the repair process for your VIN.
Is it safe to drive a 2023 Mack Md with this recall?
The safety risk is an unexpected engine shutdown while driving. NHTSA campaign 22V606 says that condition increases crash risk. If your VIN is included and the truck loses power, pull over as safely as traffic allows and contact a Mack dealer before driving it again.
When were owners notified about recall 22V606?
Mack mailed owner notification letters on September 27, 2022. If you bought the truck used or never received a letter, the VIN check still decides whether the recall applies. Use recall number 22V606 and Mack recall number SC0438 when you contact the dealer.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/22V606000 |
|---|---|
| Mack customer service | 1-800-866-1177 |
| NHTSA recall # | 22V606 |
| NHTSA recall # (full) | 22V606000 |
Source documents
-
Download Recall Document (PDF) (PDF) - Download Quarterly Report (PDF)
- Download Recall Report (PDF)
- Download Owner Notification Letter (PDF)
- Download Recall Investigation Document (PDF) (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on May 20, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →