During practice for the 2015 Chevrolet Silverado 250 at Canadian Tire Motorsport Park, Cobb crashed and was subsequently caught on camera removing a cell phone from her truck. Cobb was given a P3 penalty by NASCAR for having a non-engine electronic component in her truck. As a result, Cobb was fined $5,000, plus an additional $2,500 for an infraction occurring while still on probation for the incident with Tyler Reddick where she left her truck following a crash. Cobb was the first driver penalized by NASCAR under the no cell phone rule since it was implemented following the 2012 Daytona 500.