Recall 23V691 affects 13 2024 Mack Anthem (An) and Pinnacle (Pi/Pn) trucks for inoperative ESC software. Repair is free at any franchised Mack dealer.
Mack is recalling 13 2024 Anthem (An) and Pinnacle (Pi/Pn) trucks under recall 23V691 because a software programming error can leave the electronic stability control system inoperative. Driving without working electronic stability control can increase crash risk, and Mack dealers will complete the recall repair free of charge.
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What's wrong?
The electronic stability control system on the 2024 Mack Anthem (An) and Pinnacle (Pi/Pn) helps keep the truck stable when sensors detect a loss of control. Its ABS-Advanced (ESP+) control unit reads inputs from the yaw sensor, which tracks how the truck is rotating compared with the driver’s steering path. When the system works, it helps correct instability through the brake and stability-control hardware.
In NHTSA campaign 23V691, the problem is factory software programming. Mack traced the defect to inadequate validation of a factory programming-tool change. The ABS/ESP control unit can be programmed in a way that leaves electronic stability control inoperative, so the yaw sensor function needed for stability control does not work. The dealer repair is free and updates the control-unit software to restore that function.
After a short period of driving, the driver information display indicates that electronic stability control is not working. That display message is the warning sign owners are expected to see.
Who's affected?
Covers both Mack highway truck lines using the same ABS-Advanced (ESP+) control unit.
| 2024 Mack Anthem (An) | Electronic stability control (esc) |
|---|---|
| 2024 Mack Pinnacle (Pi/Pn) | Electronic stability control (esc) |
| Units affected | 13 |
| Field incidents | NHTSA has logged no field incidents to date. |
The 2024 model year and matching Mack model name narrow the scope, but the VIN decides. Check your VIN to confirm whether your specific truck is included.
What's the safety risk?
An inoperative electronic stability control system reduces the truck's ability to help correct a skid or loss of control, increasing crash risk. After a short period of driving, the driver information display says the system is not working. Drive cautiously and schedule the software reprogramming soon. Repair is free at any franchised Mack dealer.
What should I do?
- Check your VIN to confirm your 2024 Mack Anthem (An) or Pinnacle (Pi/Pn) is included in this recall.
- Contact a franchised Mack dealer to schedule the free control-unit software reprogramming that restores electronic stability control operation.
- Bring the recall notice if Mack mailed one. If not, reference recall number 23V691 and Mack recall SC0450 when you call.
- Drive cautiously until the software update is complete; an inoperative electronic stability control system increases crash risk.
- Call Mack customer service at 1-800-866-1177 with questions about scheduling or dealer instructions.
What happens at the repair
At the dealer, a Mack technician reprograms the control unit software so the electronic stability control system operates as intended. The software update and labor are free under the recall. If you've already paid for a related control unit software repair, Mack's standard reimbursement plan covers documented expenses. Bring your repair paperwork and proof of payment to the service desk when you arrive, or contact Mack customer service before the appointment to confirm the submission path.
| Reimbursement | Reimbursement available |
|---|
Timeline
| October 13, 2023 | NHTSA published the recall |
|---|---|
| October 19, 2023 | Dealer notification began |
| October 19, 2023 | Dealer notification ended |
| November 1, 2023 | Owner notification mailed |
| December 3, 2023 | Interim owner notification (was planned for this date) |
Frequently asked questions
What is recall 23V691?
Recall 23V691 covers 13 2024 Mack Anthem (An) and Pinnacle (Pi/Pn) trucks with a software programming error that can leave electronic stability control inoperative. Driving without ESC increases crash risk. Mack dealers will reprogram the control unit software for free.
What should I do if my 2024 Mack Anthem (An) or Pinnacle (Pi/Pn) is on this recall?
Check your VIN to confirm your specific truck is included in recall 23V691. If it is, contact a franchised Mack dealer to schedule the control unit software reprogramming. Reference Mack recall number SC0450 when you call. The repair is free.
Is the recall repair free?
Yes. Federal recall law requires manufacturers to repair covered safety defects at no cost. Mack dealers will reprogram the control unit software free of charge, with parts and labor covered for trucks included in recall 23V691.
Is it safe to drive with this Mack ESC recall?
Driving with an inoperative electronic stability control system increases crash risk. The recall does not include a do-not-drive order, but the VIN decides whether your truck is included. If your VIN is included, schedule the free software reprogramming with a Mack dealer.
When were owners notified about recall 23V691?
Mack owner letters were scheduled for December 3, 2023. If you bought the truck used or never received a letter, check your VIN to confirm whether your specific Anthem (An) or Pinnacle (Pi/Pn) is included, then call a Mack dealer.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/23V691000 |
|---|---|
| Mack customer service | 1-800-866-1177 |
| NHTSA recall # | 23V691 |
| NHTSA recall # (full) | 23V691000 |
Source documents
-
Download Quarterly Report (PDF) - Download Owner Notification Letter (PDF)
- Download Recall Investigation Document (PDF) (PDF)
- Download Recall Acknowledgement (PDF)
- Download Recall Report (PDF)
- Download Owner Notice (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 →