Recall 26V207 affects 86 2025-2027 Mack Anthem An (4) and Pioneer Pr (4) vehicles for faulty turn signals. Repair will be free once available.
Mack is recalling 86 2025-2027 Anthem An (4) and Pioneer Pr (4) vehicles because the trailer turn signals can fail to show when the driver is changing direction. That signal failure raises crash risk for surrounding traffic, and the Mack dealer repair will be free once the fix is available.
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What's wrong?
The affected 2025-2027 Mack Anthem An (4) and Pioneer Pr (4) use software to control the electrical output for trailer turn signals. That software tells the truck how much current to send through the trailer lighting circuit when the driver uses the turn signal. The trailer lamps depend on that current to flash clearly for drivers behind or beside the trailer.
On trucks built with added body builder functionality, the software uses a lower current setting than incandescent trailer lamps require. Incandescent lamps draw more current than the setting allows, so the trailer turn signal indicator does not operate as intended. Trucks built without that added functionality are not part of this issue.
The driver gets a trailer turn signal malfunction message in the instrument cluster whenever the turn signal is used. That message is the warning sign that the trailer signal circuit is not working correctly.
Who's affected?
Covers Anthem An (4) and Pioneer Pr (4) trucks across the 2025-2027 model years, all using the same turn-signal software.
| 2027 Mack Anthem An (4) | Turn signal |
|---|---|
| 2027 Mack Pioneer Pr (4) | Turn signal |
| 2026 Mack Pioneer Pr (4) | Turn signal |
| 2025 Mack Pioneer Pr (4) | Turn signal |
| Units affected | 86 |
| Field incidents | NHTSA has logged no field incidents to date. |
A matching year and model does not guarantee inclusion. Check your VIN to confirm whether your specific truck is included.
What's the safety risk?
A faulty trailer turn signal leaves other drivers without a clear signal that the vehicle is changing direction, increasing the risk of a crash. The instrument cluster shows a trailer turn signal malfunction message when the turn signal is used. Schedule the software update once Mack makes it available. Repair will be free at any franchised Mack dealer once available.
What should I do?
- Check your VIN to confirm your 2025-2027 Mack Anthem An (4) or Pioneer Pr (4) is included in this recall.
- Watch for Mack's owner letter expected May 31, 2026 before scheduling the final repair.
- Contact a franchised Mack dealer once Mack opens scheduling for the free turn-signal software update that fixes the trailer signal failure.
- Reference recall number 26V207 and Mack recall SC0493 when you call the dealer or Mack customer service.
- Use extra caution around turns and lane changes until the software update is complete.
What happens at the repair
The dealer repair is not open yet. Once Mack releases the remedy, a Mack technician will update the turn signal indicator software so the trailer turn signals operate as required. Parts and labor are covered under recall 26V207 once the repair opens. Mack uses its standard reimbursement plan for owners who already paid for this related repair. Keep receipts and repair paperwork, and contact Mack customer service or the dealer service desk for the claim process.
| Reimbursement | Reimbursement available |
|---|
Timeline
| April 1, 2026 | NHTSA published the recall |
|---|---|
| April 1, 2026 | Dealer notification began |
| April 1, 2026 | Dealer notification ended |
| April 1, 2026 | VIN-searchable in NHTSA's database — Check your VIN to see whether this recall applies to your specific vehicle. |
| April 1, 2026 | Interim owner notification (was planned for this date) |
Frequently asked questions
What is recall 26V207?
Recall 26V207 covers 86 2025-2027 Mack Anthem An (4) and Pioneer Pr (4) trailers with turn signals that do not function properly. The issue does not meet Federal Motor Vehicle Safety Standard number 108. Mack dealers will update the turn signal indicator software for free.
What should I do if my 2025-2027 Mack Anthem An (4) or Pioneer Pr (4) is on this recall?
Check your VIN to confirm your specific trailer is included in recall 26V207. If it is, contact a franchised Mack dealer and ask when the turn signal indicator software update will be available. Reference Mack recall number SC0493 when you call.
Is the recall repair free?
Yes. Mack says dealers will update the turn signal indicator software free of charge. Federal recall law requires the manufacturer to repair the defect at no cost, so parts and labor are covered at a franchised Mack dealer once the remedy opens.
What is the safety risk?
The safety risk is that the trailer turn signals do not work properly. A turn signal that fails can keep nearby drivers from seeing the driver's intended direction change, which increases crash risk. Confirm your VIN, then arrange the free dealer software update when Mack opens the repair.
When will Mack notify owners about recall 26V207?
Mack expects to mail owner notification letters on May 31, 2026. VINs became searchable on April 1, 2026, so you can check your VIN before the letter arrives. If your trailer is included, call a franchised Mack dealer and reference recall SC0493.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/26V207000 |
|---|---|
| Mack customer service | 1-800-866-1177 |
| NHTSA recall # | 26V207 |
| NHTSA recall # (full) | 26V207000 |
Source documents
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 →