Recall 25V803 covers 247 2025-2026 Mack Anthem An (4) and Pioneer Pr (4) trucks for high beams that fail to dim. Interim OTA update is free.
Mack is recalling 247 2025-2026 Anthem An (4) and Pioneer Pr (4) trucks because the automatic high beams can stay on instead of switching to low beams. The defect can reduce visibility for oncoming traffic and increase crash risk; the Mack dealer repair will be free once available.
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What's wrong?
The automatic high-beam system on the 2025-2026 Mack Anthem An (4) and Pioneer Pr (4) uses a front-looking camera and control unit to watch the road ahead. When the system sees oncoming traffic or another vehicle close enough for low beams, it is supposed to switch the headlights down without the driver using the stalk.
On affected trucks, the camera system's image-detection algorithm does not identify certain vehicles correctly during use. Mack testing found trouble identifying certain motorcycles in some scenarios. When that happens, the automatic high beams stay on instead of switching to low beams.
The warning sign is visible from the driver's seat. The high beams remain illuminated as vehicles approach, even when you expect the system to change to low beams. Once the automatic high-beam feature is disabled as an interim step, the icon no longer appears in the instrument cluster and headlamp switching returns to a manual process.
Who's affected?
Covers Anthem An (4) and Pioneer Pr (4) trucks across the 2025 and 2026 model years, all using the same lighting control software.
| 2026 Mack Anthem An (4) | Software |
|---|---|
| 2025 Mack Pioneer Pr (4) | Software |
| 2026 Mack Pioneer Pr (4) | Software |
| Units affected | 247 |
| Field incidents | NHTSA has logged no field incidents to date. |
A matching year and model does not confirm inclusion. Check your VIN to confirm whether your specific truck is included.
What's the safety risk?
Oncoming drivers can have reduced visibility if the high beams stay on instead of switching to low beam, increasing the risk of a crash. If you see the high beams remain illuminated as vehicles approach, use extra caution and contact a Mack dealer about the interim software update. Repair will be free at any franchised Mack dealer once available.
What should I do?
- Check your VIN to confirm your 2025-2026 Mack Anthem An (4) or Pioneer Pr (4) is included in this recall.
- Watch for Mack's final-remedy letter, anticipated June 1, 2026, and keep the interim software update installed until the final repair opens.
- Contact a franchised Mack dealer or Mack customer service at 1-800-866-1177 to confirm the free over-the-air software update that disables automatic high beams so they do not stay on high beam for oncoming traffic.
- Reference recall number 25V803 and Mack recall SC0488 when you call.
- Use extra care at night until the final repair is complete, and switch from high beam to low beam manually when oncoming traffic is present.
What happens at the repair
The interim fix is software, not a parts replacement. Mack will send an over the air software update that disables the automatic high beams, free of charge. The final remedy is still under development, and any final dealer work will be free once Mack opens it. If you've already paid for a related repair before the recall notice, Mack's standard reimbursement plan covers documented eligible expenses. Keep invoices and repair paperwork, then contact Mack customer service or ask a Mack service desk how to submit the claim.
| Reimbursement | Reimbursement available |
|---|
Timeline
| November 20, 2025 | NHTSA published the recall |
|---|---|
| November 27, 2025 | Dealer notification began |
| November 27, 2025 | Dealer notification ended |
| November 27, 2025 | VIN-searchable in NHTSA's database — Check your VIN to see whether this recall applies to your specific vehicle. |
| December 22, 2025 | Interim owner notification (was planned for this date) |
Frequently asked questions
What is recall 25V803?
Recall 25V803 covers 247 Mack Anthem An (4) and Pioneer Pr (4) vehicles with automatic high beams that do not switch to low beams correctly. That can reduce visibility for oncoming traffic and increase crash risk. Mack is disabling the AHB feature by free OTA software update while the final remedy is developed.
What should I do if my 2026 Mack Anthem An (4) or 2025-2026 Mack Pioneer Pr (4) is on this recall?
Check your VIN to confirm your specific truck is included in recall 25V803. If it is, contact a franchised Mack dealer or Mack customer service at 1-800-866-1177 and reference Mack recall SC0488. The interim OTA software update is free.
Is the recall repair free?
Yes. Federal recall law requires manufacturers to repair safety defects at no cost. Mack will provide the interim OTA software update for free, and the final remedy will also be free once Mack makes it available.
Is it safe to drive with this Mack high-beam recall?
The recall does not include a do-not-drive order. The safety concern is that automatic high beams that stay on can reduce visibility for oncoming traffic and increase crash risk. Until the interim software update is complete, use extra care with headlight control and contact Mack if the AHB feature does not behave normally.
When will Mack send recall letters for 25V803?
Mack mailed interim owner notification letters on January 7, 2026. Additional letters will be sent once the final remedy is available, which Mack expects on June 1, 2026. If you bought the truck used or never received a letter, check your VIN and reference recall SC0488 when you call Mack.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/25V803000 |
|---|---|
| Mack customer service | 1-800-866-1177 |
| NHTSA recall # | 25V803 |
| NHTSA recall # (full) | 25V803000 |
Source documents
-
Download Recall Document (PDF) (PDF) - Download Recall Report (PDF)
- Download Owner Notice (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on May 19, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →