McLaren's Stella Confirms Engine Failures but Won't Blame Mercedes

McLaren’s Chinese Grand Prix weekend collapsed when both cars failed to start, each suffering an electrical fault in their Mercedes power units. Team principal Andrea Stella said the problems stemmed from the same electrical area of the unit but emphasized they are not blaming Mercedes, and promised a joint investigation with High Performance Powertrains.

Why it matters:

• No start means zero points, setting McLaren back in the early‑season championship battle.
• The fault puts the reliability of Mercedes’ customer‑team power units under scrutiny, potentially affecting multiple squads.

The details:

• Both cars lost communication with the electrical side of the Mercedes power unit, preventing the battery‑ECU link needed to start the engine.
• Stella called the simultaneous failures ‘exceptional and uncharacteristic’ and said a joint review with Mercedes’ High Performance Powertrains (HPP) is under way.

What's next:

• McLaren will work with Mercedes’ High Performance Powertrains (HPP) on a joint technical review before the next race, focusing on the battery‑ECU interface.
• If the issue traces to the power unit, Mercedes may issue a technical directive for all customer teams while McLaren runs internal wiring checks.