Fernando Alonso says Aston Martin still lacks an answer for his formation-lap shutdown.

Fernando Alonso's car shut down during the formation lap at Silverstone, forcing him to start from the pit lane. He restarted the car and completed the race without the same problem returning.

Mike Krack said Aston Martin still did not know the cause after the race debrief. The team planned to check data from the ECU, chassis and energy systems.