# NHTSA recall 25V521000

A recall listed here may apply to a vehicle of this year, make and model. Only the manufacturer can say whether it applies to one vehicle: check the VIN with the official lookups.

- Published by: NHTSA \(United States\)
- Campaign number: 25V521000
- Manufacturer's number: SC0483
- Manufacturer: Mack Trucks, Inc.
- Reported: 2025\-08\-11
- Owners notified: 2025\-08\-21
- Component: STEERING
- Units potentially affected: 32
- Part numbers: Software Parameter Feature \(Oversteer Guidance\) P1HF9

## What is wrong

Mack Trucks, Inc. \(Mack\) is recalling certain 2025 Anthem and 2025\-2026 Pioneer vehicles. The dynamic steering and oversteer guidance feature may malfunction and cause a loss of steering control.


## What can happen

A loss of steering control increases the risk of a crash.


## The remedy

The oversteer guidance feature will be disabled through an over\-the\-air \(OTA\) update or by a dealer, free of charge. Owner notification letters were mailed August 21, 2025. Owners may contact Mack's customer service at 1\-800\-866\-1177. Mack's number for this recall is SC0483.


## Remedy progress the manufacturer reported

- Report: Quarterly report 5, for 2026 quarter 3
- Filed with NHTSA: 2026\-10\-07
- Vehicles in the campaign: 32
- Reported remedied: 32 \(100%\)
- Reported unreachable: 0
- Reported removed: 0

These are the manufacturer's totals for the whole campaign at the end of 2026 quarter 3, as filed with NHTSA. They do not say whether one vehicle has been remedied: check the VIN with the official lookups. The reports are from data as of 2026\-10\-19.

## Vehicles this campaign lists

- [2025 MACK ANTHEM \(AN\)](/makes/mack/anthem/2025/recalls.md). Built 2024\-11\-04 to 2024\-11\-04. Listed as a series or trim of this model.
- [2025 MACK PIONEER PR \(4\)](/makes/mack/pioneer/2025/recalls.md). Built 2024\-10\-22 to 2024\-11\-08. Listed as a series or trim of this model.
- [2026 MACK PIONEER PR \(4\)](/makes/mack/pioneer/2026/recalls.md). Built 2025\-02\-24 to 2025\-06\-23. Listed as a series or trim of this model.

## Bulletins for the same vehicles and component

A bulletin is the manufacturer's note to its dealers. It is not part of this recall.

- [S0285 202410](/bulletins/11009712.md), 2024-11-04, Service campaign
- [S3949 202406](/bulletins/11003045.md), 2024-07-03, Service campaign
- [CBR\-2375 202405](/bulletins/11000836.md), 2024-06-04, Service bulletin
- [S3949 202404](/bulletins/10253781.md), 2024-05-01, Service bulletin

## Check a VIN

- [NHTSA recall lookup by VIN, United States](https://www.nhtsa.gov/recalls)
- [Transport Canada recall search, Canada](https://wwwapps.tc.gc.ca/Saf-Sec-Sur/7/VRDB-BDRV/search-recherche/menu.aspx?lang=eng)

JSON: [/v1/recalls/nhtsa/25V521000](/v1/recalls/nhtsa/25V521000)

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