Honda Admits Reliability Slide After Aston Martin Suffers Multiple Retirements

Overview

• Aston Martin recorded five retirements across three recent race weekends, with Lance Stroll retiring at the Brazilian Grand Prix on Tuesday because of a battery failure that Motorsport reports was his 13th DNF of 2026.
• Honda says engineers can observe the battery and ERS failure events but have not identified the underlying root cause and expect a multi‑week investigation involving data checks and component inspections.
• An ERS cooling issue at high altitude in Mexico City earlier this month has already driven telemetry‑led changes that will inform a two‑phase overhaul and a redesigned power unit for 2027.
• Team and supplier pressure has risen: Honda CEO Toshihiro Mibe met Aston Martin owner Lawrence Stroll and senior team officials in São Paulo to discuss urgent fixes and 2027 delivery plans.
• Background factors include the 2026 removal of the MGU‑H, which shifted energy management demands onto batteries and ERS cooling, and wet conditions at Interlagos that temporarily hid engine power and deployment weaknesses.