VinFast VF 8 and VF 9 Problems: When Software, Charging, and Safety Defects Become a Lemon

The VinFast VF 8 and VF 9 have earned a reputation for a specific set of problems: software glitches, slow or interrupted charging, range that falls short of the rated figure, and driver-assistance features that behave unpredictably. If your VinFast has one of these defects and the manufacturer has not been able to fix it after a reasonable number of attempts, California's lemon law may entitle you to a buyback, a replacement, or a cash settlement. This article walks through the signature VinFast issues and when each one can make your vehicle a lemon.

Software glitches and dashboard errors

VinFast built the VF 8 and VF 9 as software-defined vehicles, which means much of the car's behavior is controlled by code — and code can misbehave. Owners and reviewers have reported recurring dashboard error messages, screens that freeze or reboot, and features that work differently from one software update to the next. Some early cars displayed warning messages, including fault alerts, on almost every startup. VinFast has pushed software updates to address many of these issues, and later production batches are generally described as more polished. But when a software defect keeps coming back after repeated update attempts, the persistence of the problem — not the promise of the next patch — is what matters under the lemon law.

Charging problems

Charging has been one of the most widely reported VinFast complaints. Some VF 8 owners have said their vehicle charges far more slowly than its rated capability, and that the car stops charging on its own during the night, forcing them to re-plug the connector several times before the battery reaches a usable level. These complaints became prominent enough that VF 8 owners filed a class-action lawsuit in late 2025 over alleged slow-charging and charging-interruption defects. A car you cannot reliably charge is a car you cannot reliably use — which is precisely the kind of substantial impairment the lemon law addresses.

Range shortfalls

Range is the number EV buyers care about most, and several VinFast reviews and owner reports describe real-world range that lands meaningfully below the advertised figure, particularly at highway speeds. Some range variation is normal for any EV depending on weather, speed, and driving style. But a persistent, significant gap between rated and delivered range — especially when paired with charging problems — can leave an owner unable to depend on the vehicle for ordinary trips, and that reliability failure can support a lemon law claim.

Driver-assistance and steering behavior

The VF 8's driver-assistance system drew regulatory attention. In September 2024, the National Highway Traffic Safety Administration opened an investigation into lane-keeping behavior on 2023–2024 VF 8 vehicles after reports of unexpected steering inputs. VinFast later issued a recall to update the driver-assistance software — reducing steering-wheel vibration when the system engages, making it easier for the driver to override the system, and slowing the hand-off of control back to the driver. Owner notification letters were mailed in late October 2025 and the recall campaign began at the end of that month, after which NHTSA closed its investigation. A recall by itself does not automatically make a car a lemon, but if a safety-related defect like this is not actually resolved after the manufacturer's repair attempts, it can be a strong basis for a claim.

Build-quality issues

Beyond the electronics, early VinFast reviews and owner reports flagged fit-and-finish and build-quality concerns — interior rattles, trim and assembly problems, and charge-port or charge-door faults. Individually, minor quality issues may not rise to the level of a lemon. But when they accumulate, or when a specific defect keeps the car in the shop repeatedly without a lasting fix, they can contribute to a qualifying claim, especially alongside the software and charging problems described above.

When these problems make your VinFast a lemon

Under California's Song-Beverly Consumer Warranty Act, a vehicle may qualify as a lemon when a substantial defect covered by the warranty cannot be repaired after a reasonable number of attempts, or when the car spends an extended cumulative period out of service for warranty repairs. Defects that could cause serious injury — like an unpredictable steering or driver-assistance problem — can qualify after fewer attempts. Because so many VinFast issues are handled through software and over-the-air updates, keep a dated written record of every reported problem and every attempted fix, even the remote ones. That documentation is often the difference between a strong claim and a disputed one.

What to do next

If your VF 8 or VF 9 keeps coming back with the same defect, gather your repair orders, warranty paperwork, and any records of software updates, then have the file reviewed by a lemon law attorney. California requires the manufacturer to pay your reasonable attorney fees and costs on a successful claim, so a free case review and representation typically cost you nothing out of pocket.