2020-2025 Mack Heavy Trucks Recall 24V792: ECU Fault

Recall 24V792 affects 59,338 2020-2025 Mack trucks with ECU faults that can reduce ABS and stability control. Repair is free at any franchised Mack dealer.

What's wrong?

The Bendix EC80 Advanced Electronic Control Unit on these 2020-2025 Mack trucks is the computer that manages anti-lock braking and related stability functions. It reads signals from the truck and trailer communication circuits, then sends commands that help the brakes and stability systems respond correctly. On trucks equipped to tow a trailer, that communication includes the power line carrier, the signal path used for trailer messages.

On affected Mack Granite (Gr), Pinnacle (Pi/Pn), Anthem (An), Pioneer Pr (4), and Terrapro (Te) trucks, electrical noise and a low signal on that power line carrier can confuse the control unit. The software can process a command incorrectly or stop working. Mack traced the defect to systems validation that did not catch the problem in the operating environment.

The warning sign is the ABS warning lamp. It illuminates when the system detects an ABS fault or when ABS stops operating, so treat that light as the visible cue to contact a Mack dealer.

Who's affected?

Covers Mack truck lines from 2020-2025, with the same ABS-Advanced control unit tied to brake control and electrical software.

The year and model narrow the scope, but the VIN decides. Check your VIN to confirm whether your specific truck is included.

What's the safety risk?

When the ECU software fault affects safety systems, Automatic Traction Control, ABS, Electronic Stability Control, Active Cruise Control, and Collision Mitigation System can have diminished or lost function and raise crash risk. The ABS warning lamp comes on when ABS detects a fault or stops operating. Schedule service soon. Repair is free at any franchised Mack dealer.

What should I do?

1. Check your VIN to confirm your 2020-2025 Mack Granite (Gr), Pinnacle (Pi/Pn), Anthem (An), Pioneer Pr (4), or Terrapro (Te) is included in this recall.
2. Contact a franchised Mack dealer to schedule the free ECU software reprogramming that fixes the command-processing problem affecting ABS, traction control, stability control, active cruise control, and collision mitigation systems.
3. Bring the recall notice if Mack mailed one. If not, reference recall number 24V792 and Mack recall SC0472 when you call.
4. Drive with extra space and caution until the repair is complete, since the ECU fault affects safety systems tied to braking, stability, and cruise control.
5. Call Mack customer service at 1-800-866-1177 with questions about scheduling or dealer instructions.

What happens at the repair

At the dealer, a Mack technician reprograms the ECU software so the Bendix EC80 Advanced Electronic Control Unit processes commands correctly. The recall repair is free, and parts and labor are covered. If you already paid for a related ECU software repair before the recall notice, ask Mack customer service or the dealer service desk how to submit documentation under Mack's standard reimbursement plan.

Timeline

Frequently asked questions

More information

Source documents

• Download Quarterly Report (PDF) · RCLQRT
• Download Recall Investigation Document (PDF) (PDF) · RCRIT
• Download Recall Report (PDF) · RCLRPT
• Download Owner Notice (PDF) · RCMN
• Download Misc. Document (PDF) · RMISC
• Download Owner Notification Letter (PDF) · RCONL
• Download Recall Acknowledgement (PDF) · RCAK

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 →