GM Ultium platform: instrument panel + rearview camera FMVSS violations (Honda Prologue + Acura ZDX, 26V112)
- Manufacturer
- Honda / Acura
- Model
- Prologue / ZDX
- Years affected
- 2024
- Risk type
- Multi-FMVSS software defect — simultaneous FMVSS 101, FMVSS 111, FMVSS 305 violations. Sixth FMVSS 111 platform documented on this site (after Polestar 2, e-TNGA family, Audi PPE, Volvo SPA2/SEA, Tesla Cybertruck).
- Issue
- GM Ultium platform vehicles built by Honda (Prologue) and Acura (ZDX) ship with a software defect in the radio control module that simultaneously violates three Federal Motor Vehicle Safety Standards: FMVSS 101 (Controls and Displays), FMVSS 111 (Rear Visibility), and FMVSS 305 (Electric Powered Vehicle Safety). The instrument panel display can fail (going blank or freezing) and the rearview camera can display a blank screen when the vehicle is in reverse. Honda's NHTSA campaign 26V112 covers 65,135 vehicles total (2024 Honda Prologue + 2024 Acura ZDX). The same software defect affects both nameplates because both share GM's Ultium electrical architecture and the same radio control module software stack.
Summary
NHTSA campaign 26V112 covers 65,135 GM Ultium-platform vehicles (2024 Honda Prologue + 2024 Acura ZDX) for a software defect in the radio control module that simultaneously violates three Federal Motor Vehicle Safety Standards. This is the only triple-FMVSS recall documented on this site, and the sixth FMVSS 111 (rear visibility) platform — joining Polestar 2 (Geely CMA), the e-TNGA family (Toyota bZ4X / Lexus RZ / Subaru Solterra), Audi PPE (Q6 e-tron + Porsche Macan EV), Volvo SPA2/SEA (EX30/EX40/EX90), and Tesla Cybertruck. The pattern across six platforms now spans every major EV manufacturer category: legacy luxury (Audi, Volvo), Asian volume (Toyota, Honda, Acura), Chinese-owned European (Polestar/Volvo/Geely), and American novel-architecture (Tesla, GM).
Timeline
March 22-October 14, 2024: Affected vehicle production at GM Ramos Arizpe (Honda Prologue) and GM Spring Hill, Tennessee (Acura ZDX). The radio control module software at issue is a shared GM Ultium component used across Cadillac Lyriq, Chevrolet Blazer EV, Equinox EV, Silverado EV, GMC Hummer EV, Honda Prologue, and Acura ZDX. Honda Engineering identified the software defect, validated the FMVSS 101/111/305 violation patterns, and filed the NHTSA recall on March 4, 2026. Owner notification letters scheduled for April 20, 2026. VINs searchable on NHTSA.gov starting March 4, 2026. Remedy is a dealer-installed software update to the radio control module.
The 65,135-vehicle scope makes this the largest Honda EV recall in U.S. history, exceeding any single-campaign recall on the Honda Clarity Electric or earlier hybrid Insight programs.
Consumer impact
For owners, the practical impact is variable. Some affected vehicles experience the failure mode regularly (multiple times per drive cycle); others rarely or never experience it. Honda's recall filing acknowledged that the failure mode prevents drivers from accessing required vehicle information (FMVSS 101 violation) and from accessing rearview camera imagery when reversing (FMVSS 111 violation). Both impacts are safety-relevant: a blank instrument cluster can prevent the driver from seeing critical warning indicators including HV battery system warnings, low-tire-pressure warnings, and brake-system warnings. A blank rearview camera reduces the driver's ability to detect children and pedestrians behind the vehicle when reversing.
The remedy is straightforward — a dealer-installed software update to the radio control module — but parts and software availability at the dealer depends on Honda's rollout schedule. Owners experiencing the failure mode should request expedited service appointment scheduling and document each occurrence.
Help other owners — file with the regulator
If your vehicle is affected by this defect, filing a complaint with NHTSA, Transport Canada, DVSA, or your regional regulator helps build the data record. Each report contributes to pattern detection that can trigger formal investigations and recalls — protecting other owners of the same vehicle, not just you.
You can file at any time, even if your dealer or manufacturer is already handling repairs. The regulatory complaint is a separate channel that helps every owner of your vehicle.
Verify your vehicle with the regulator
The regulator in your jurisdiction is always the authoritative source for whether your specific VIN is affected by an open safety campaign. Check the database below using your vehicle identification number.
- United States — NHTSA (US)
- Canada — Transport Canada
- NHTSA campaign 26V112000 — NHTSA campaign 26V112000
- Honda recall information page — Honda recall information page
- Acura recall information page — Acura recall information page
- Transport Canada — Transport Canada
EV Risk Index editorializes around public recall data; we do not replace regulatory guidance. If you believe your vehicle is affected by a safety recall, contact the manufacturer and check the regulator database for your jurisdiction using your VIN.