Tesla supplied Toyota with the RAV4 EV’s electric propulsion system from 2012 until the $50,000 crossover was discontinued last year after sales failed to gain traction. Though the problem affects only a small number of vehicles, flaws in Tesla’s technology pose a significant risk to the 11-year-old Fremont, California, boutique luxury electric-car maker. Tesla has supplied powertrain systems and components for Daimler’s Smart Fortwo and Mercedes-Benz’s A-Class electric cars. It also continues to be a supplier for the Mercedes-Benz B-Class EV. In Tesla’s 2014 annual report released in late February, the company listed recalls of its powertrain systems as a risk to the company’s future profitability.