Recall 23V792 covers 650 2023-2024 Mack Anthem, Terrapro, Granite, and Lr trucks for accelerator return-to-idle failure. Repair will be free once available.
Mack is recalling 650 2023-2024 Anthem (An), Terrapro (Te), Granite (Gr), and Lr trucks because a disconnected accelerator pedal position sensor can keep the engine from returning to idle within 2 seconds. That delay can cause loss of vehicle control and raise crash risk; the Mack dealer repair will be free once Mack makes it available.
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What's wrong?
The accelerator pedal assembly on these 2023-2024 Mack Anthem (An), Terrapro (Te), Granite (Gr), and Lr trucks includes a position sensor that tells the engine how much power the driver is asking for. When you press or release the pedal, that sensor signal changes, and the engine controller uses it to add power or return the engine to idle.
On affected trucks, the problem appears when Pin B in the pedal circuit is open. Instead of reading the open circuit as an error, the pedal signal defaults to 3.8V, which the engine reads as 100% driver demand. That means the engine does not return to idle within 2 seconds after the driver lets off the accelerator.
The warning sign is a delayed return to engine idle. If the engine continues to hold speed longer than expected after you release the accelerator, that is the symptom tied to this defect.
Who's affected?
Covers four Mack truck lines from the 2023 and 2024 model years, all tied to the accelerator pedal speed-control component.
| 2023 Mack Anthem (An) | Vehicle speed control |
|---|---|
| 2023 Mack Terrapro (Te) | Vehicle speed control |
| 2024 Mack Anthem (An) | Vehicle speed control |
| 2023 Mack Granite (Gr) | Vehicle speed control |
| 2024 Mack Granite (Gr) | Vehicle speed control |
| 2024 Mack Lr | Vehicle speed control |
| 2023 Mack Lr | Vehicle speed control |
| 2024 Mack Terrapro (Te) | Vehicle speed control |
| Units affected | 650 |
| 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 delayed return to engine idle can make the truck harder to control and increase the risk of a crash. If the engine stays above idle after you lift off the throttle, ease off, create space, and arrange service soon. Repair will be free at any franchised Mack dealer once available.
What should I do?
- Check your VIN to confirm your 2023-2024 Mack Anthem (An), Terrapro (Te), Granite (Gr), or Lr is included in this recall.
- Wait for Mack's remedy instructions before scheduling the repair.
- Contact a franchised Mack dealer once the repair opens to schedule the free throttle-pedal replacement and software update that restores normal accelerator return-to-idle control.
- Bring the recall notice if Mack mailed one. If not, reference recall number 23V792 when you call.
- Call Mack customer service at 1-800-866-1177 with questions about recall number 23V792.
What happens at the repair
The final dealer remedy is still listed as under development, so do not assume the repair can be scheduled yet. Once Mack opens the repair, a Mack technician will replace the throttle pedal and update the vehicle software. Parts and labor will be free under the recall. Owner letters were mailed February 27, 2024, and Mack identifies this campaign as SC0455.
Timeline
| November 22, 2023 | NHTSA published the recall |
|---|---|
| November 27, 2023 | Dealer notification began |
| November 27, 2023 | Dealer notification ended |
| January 21, 2024 | VIN-searchable in NHTSA's database — Check your VIN to see whether this recall applies to your specific vehicle. |
| January 21, 2024 | Interim owner notification (was planned for this date) |
| February 27, 2024 | Owner notification mailed |
Frequently asked questions
What is recall 23V792?
Recall 23V792 covers 650 2023-2024 Mack Anthem (An), Terrapro (Te), Granite (Gr), and Lr vehicles. If the accelerator pedal position sensor disconnects, the engine does not return to idle within 2 seconds, which can cause loss of vehicle control. Mack will replace the throttle pedal and update vehicle software for free.
What should I do if my 2023-2024 Mack Anthem (An), Terrapro (Te), Granite (Gr), or Lr is on this recall?
Check your VIN to confirm your specific vehicle is included in recall 23V792. If it is, contact a franchised Mack dealer and ask for recall SC0455. Mack customer service is also available at 1-800-866-1177. The repair is free.
Is the recall repair free?
Yes. Mack will replace the throttle pedal and update the vehicle software free of charge. Federal recall law requires the manufacturer to repair the defect at no cost at a franchised Mack dealer.
What is the safety risk?
The safety risk is loss of vehicle control. If the accelerator pedal position sensor disconnects, the engine does not return to idle quickly enough, which increases crash risk. If your VIN is included, schedule the free throttle pedal replacement and software update with a Mack dealer.
When did Mack notify owners about recall 23V792?
Mack mailed owner letters on February 27, 2024. If you bought the vehicle used or never received a letter, check your VIN and reference recall SC0455 when you call a franchised Mack dealer.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/23V792000 |
|---|---|
| Mack customer service | 1-800-866-1177 |
| NHTSA recall # | 23V792 |
| NHTSA recall # (full) | 23V792000 |
Source documents
-
Download Quarterly Report (PDF) - Download Owner Notification Letter (PDF)
- Download Recall Report (PDF)
- Download Recall Investigation Document (PDF) (PDF)
- Download Owner Notice (PDF)
- Download Recall Document (PDF) (PDF)
- Download Recall Acknowledgement (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 →