BYD Resets Warranties After Supplier Code Error Swapped Da Tang Wheel Rims

BYD has restarted full-vehicle warranties on every affected Da Tang EV SUV and pledged free wheel rim swaps, after confirming that a supplier's code entry error put front and rear rims in the wrong positions on an undisclosed number of flagship SUVs. The company traced the fault to Hubei Boyu Industrial Co Ltd, the wheel rim subassembly supplier, and said dedicated testing found no impact on handling or driving safety.

The Chinese new energy vehicle maker apologized in a statement on Wednesday. "We sincerely apologize for the inconvenience this incident has caused owners," BYD said, pledging a comprehensive review and continued corrective action with its supplier.

What exactly went wrong on the line?

Owners first flagged the problem on Chinese social media: the Da Tang EV version with 20-inch rims uses different rim and tire widths front and rear, and some vehicles left the factory with the two positions reversed. The factory specification calls for 8J×20 rims with 255/50R20 tires at the front and 9J×20 rims with 275/45R20 tires at the rear. On the affected vehicles, those rim widths were simply swapped between axles.

BYD's investigation traced the mix-up to a code entry error at Hubei Boyu, which led to incorrect installation on some vehicles. The automaker said it immediately began inspections and corrected the codes to prevent the issue from recurring in later batches. It also worked with the supplier to introduce visual error prevention systems and additional safeguards on the production line.

The statement did not disclose the number of vehicles or production batches involved — a gap that leaves the scale of the recall-style action unverified against production data.

What does BYD owe affected owners?

The remedy package BYD announced runs beyond a simple repair:

• Free vehicle inspections and wheel rim swaps at local service centers
• Loaner vehicles or reimbursement of transportation expenses
• A full-vehicle warranty restart, effective immediately, on every affected car

BYD said its own testing showed handling was unaffected and the reversed rims posed no driving safety risk. That claim is the company's; the number of affected units remains the key missing figure for judging how widely the error spread through the assembly plant.

Why the timing matters for BYD

The defect lands while the Da Tang carries real volume for BYD in the large electric SUV segment. The model recorded 14,000 sales in October alone, according to a poster released earlier this month by Lu Tian, general manager of BYD's Dynasty lineup sales division. Cumulative sales from June 17 through October 31 reached 54,222 units.

Lu said in a November 3 Weibo post that the Da Tang had sold more than 10,000 vehicles a month for four consecutive months, and that BYD was increasing production capacity to accelerate deliveries.

The Da Tang EV went on sale in China on June 17 as the first D-segment flagship SUV in BYD's Dynasty lineup, with a seven-seat cabin in a 2+2+3 layout. At launch it was offered in four variants priced from 239,900 yuan ($35,700) to 309,900 yuan, equipped with second-generation Blade Battery and flash charging technology. For comparison, the entry price sits below the mainstream premium SUV band in China while the specification targets that class.

What to watch next

The number to watch is the affected vehicle count, which BYD has not released. Watch also for evidence that the visual error prevention systems at Hubei Boyu hold, whether warranty restarts translate into measurable owner retention, and whether the capacity increases Lu promised keep the Da Tang above 10,000 monthly units as the fix campaign runs through service centers.