Mack Anthem (An), Mack Granite (Gr), Mack Granite (Gu), Mack Pinnacle (Chu), Mack Pinnacle (Cxu), Mack Pinnacle (Pi), model years 2018 to 2022. Filed by Mack Trucks, Inc. and reported to NHTSA on 1 April 2021. 557 vehicles potentially affected.
What the notice says Mack Trucks, Inc. (Mack) is recalling certain 2018-2022 Anthem (AN), Granite (GR/GU), and Pinnacle (CHU/CXU/PI) vehicles equipped with "camelback" rear suspension and electronic stability control. The vehicles may not stay in their lane at certain speeds. As such, these vehicles fail to comply with the requirements of …
Is your vehicle included? Check with your VIN at NHTSA, or ask a dealer. This page is an independent copy of the notice, kept so you can see what changed after it was published. It is not the authority, and the authority’s own text is the one to act on.
Mack's own number for this recall: SC0423. That is the number on the owner letter and on the dealer paperwork. 21V233 is the number NHTSA gave the same campaign, and the number this page is filed under. They are one recall, written two ways.
What owners ask about this recall
- Which vehicles does recall 21V233 cover?
- Mack Anthem (An), Mack Granite (GR), Mack Granite (Gu), Mack Pinnacle (Chu), Mack Pinnacle (Cxu), Mack Pinnacle (Pi), model years 2018-2022.
- What is wrong with them?
- Mack Trucks, Inc. (Mack) is recalling certain 2018-2022 Anthem (AN), Granite (GR/GU), and Pinnacle (CHU/CXU/PI) vehicles equipped with "camelback" rear suspension and electronic stability control. The vehicles may not stay in their lane at certain speeds.
- What can happen if it is not put right?
- A vehicle that drifts out of its lane increases the risk of a crash.
- Is there a fix yet?
- Yes, and it is free. Mack will notify owners, and dealers will reprogram the vehicle control units, free of charge. The recall began on April 21, 2021. Owners may contact Mack customer service at 1-800-866-1177. Mack's number for this recall is SC0423.
- What should I do now?
- Check your own vehicle by its VIN with NHTSA, which is the record to act on. Mack calls this recall SC0423, which is the number on the owner letter and the dealer paperwork.
Answered from the register this site holds. NHTSA is the record to act on.
What the authority says can happen if this is not fixed: “A vehicle that drifts out of its lane increases the risk of a crash.”
affected
in the notice
caught
| Campaign | 21V233 |
|---|---|
| Filed by | Mack Trucks, Inc. |
| System at fault | Electronic Stability Control (ESC):Control Module:Software |
| Reported to NHTSA | 1 April 2021 |
| Model years | 2018-2022 |
| Vehicles named | MACK ANTHEM (AN), MACK GRANITE (GR), MACK GRANITE (GU), MACK PINNACLE (CHU), MACK PINNACLE (CXU), MACK PINNACLE (PI) |
What the notice says today
The consequence
A vehicle that drifts out of its lane increases the risk of a crash.
The remedy
Mack will notify owners, and dealers will reprogram the vehicle control units, free of charge. The recall began on April 21, 2021. Owners may contact Mack customer service at 1-800-866-1177. Mack's number for this recall is SC0423.
What it said before
This campaign is in the register but not yet in the dated wording archive, so we cannot yet say whether its text has moved. It enters the archive on the next pass.
This is one of 84 notices in the record whose component field names electronic stability control (esc). Across that group the median wait before owners were written to was 46 days.
Last checked . No change has been recorded in the wording.
The models named here, across their whole recall history
- Mack Anthem (An) recalls: 23 US campaigns
- Mack Granite (GR) recalls: 26 US campaigns
- Mack Granite (Gu) recalls: 29 US campaigns
- Mack Pinnacle (Chu) recalls: 20 US campaigns
- Mack Pinnacle (Cxu) recalls: 41 US campaigns
How to cite this record
Quoting the wording on this page means quoting a version, so the date belongs in the citation:
CarsMultiverse, recall 21V233, wording as read on 16 September 2026. https://carsmultiverse.com/recall/21v233/
The cross-border matches used on this site are deposited as a citable dataset: doi:10.5281/zenodo.22087136. The recall wording itself is published by the national authority named above and is theirs, not ours.
The recall record and its wording are published by the US National Highway Traffic Safety Administration and are US Government public domain. The dated archive, the comparison and any before-and-after above are CarsMultiverse. How fresh every engine behind this page is, is public on the status page. To check a specific vehicle, use NHTSA’s own VIN lookup.
Other Mack notices we hold
- 26V515: 2027 Anthem AN (4) and Pioneer PR (4)
- 26V509: 2025 TerraPro trucks
- 26V351: 2026 Anthem (AN), 2026-2027 Pioneer PR (4), Pinnacle (PI/PN), Granite (GR), and 2027 Anthem AN (4)
- 26V261: 2025-2027 Pioneer (4) and 2026-2027 Anthem (4)
- 26V207: 2025-2027 Pioneer (4) and 2027 Anthem (4) trailers
- 26V139: 2022-2027 TerraPro trucks
- 26E055: Grote replacement marker lights with part number 78513681
- 25V867: 2010-2016 Granite (GU) trucks
All 113 Mack campaigns we hold · Every manufacturer in the record
The fingerprint of this notice
We take a SHA-256 of each of the three blocks of text the authority publishes and keep the first eight characters. As we last read campaign 21V233 on 23 August 2026, they were:
- Defect summary
2c3a989f - Consequence
81c85783 - Remedy
cc4b74e0
We first read this notice on 21 August 2026. It has not moved since. If it ever does, these characters will not match, and the change will be dated here.
The wording we hold for 21V233 · how the whole register is watched
This notice names one vehicle among several registers that have written about it. Every notice this site holds for the Mack Pinnacle (Chu), in all seven, is kept on that vehicle's own page, with the newest in each.
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Owners of these cars
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