McLaren Breaks Curfew to Fix Norris Monaco Electrical Fault

Lando Norris lost nearly all of Monaco practice after an electrical fault stopped his McLaren within ten minutes of the session starting. The team used its first curfew exception of the 2026 season to replace the wiring harness and ESME battery pack overnight, and was later fined €30,000—€10,000 suspended—for a separate safety violation involving the clutch disengagement system.

Why it matters:

At a circuit where seat time is everything, losing a full practice session throws off the rhythm of the reigning world champion and his engineering crew. The failure also bore striking similarities to the ERS issue that ended George Russell's race in Canada, suggesting a potential pattern in the Mercedes-supplied power unit hardware that could threaten multiple customer teams if left unresolved.

The details:

• McLaren traced Norris's shutdown at the Nouvelle Chicane runoff to a sudden ERS system failure, with Zak Brown initially suspecting the battery. The team replaced the wiring harness and ESME pack after breaking Friday's curfew, burning one of its four permitted exceptions for the championship.
• The problem mirrors Russell's unexpected ERS kill in Montreal, after which Mercedes deputy team principal Bradley Lord warned it could take months to fully analyze the failed hardware shipped back to the UK.
• Separately, stewards fined McLaren €30,000 after discovering transparent tape over the clutch disengagement system button. Applied for aerodynamic reasons, the tape prevented gloved marshals from activating the system by hand. Officials suspended €10,000 of the penalty for 12 months, noting a previous penalty should have served as a warning.

What's next:

With Mercedes still investigating the root cause of the ERS failures, McLaren faces a tense wait to see if the overnight fix holds and whether the problem resurfaces on its remaining pool of power units. Having already spent a curfew joker and drawn fresh scrutiny over safety protocol compliance, the Woking outfit can ill afford another disrupted weekend as the title fight intensifies.