Russell and Mercedes Frustrated as Fresh Power Unit Issue Wreaks Havoc at Hungarian GP

George Russell and Mercedes are confronting yet another technical headache after a power unit glitch destroyed his Hungarian Grand Prix start, sending him plummeting from sixth to 21st before he recovered to seventh. The team is now launching another investigation into a brand-new engine that began revving erratically and ignored his throttle inputs on the grid.

Why it matters:

Russell trails teammate and championship leader Kimi Antonelli by 59 points heading into the summer break, leaving his title hopes hanging by a thread. Mercedes cannot sustain a championship challenge when one car is repeatedly compromised by reliability failures, and Russell admitted the entire team is as frustrated as he is with the constant setbacks.

The details:

• Russell explained that roughly four seconds before the lights went out, his power unit began "revving all over the place" while his throttle inputs produced zero response, triggering anti-stall and allowing the entire field to stream past.
• The power unit was brand new, and while Russell had not experienced this specific issue during the 2026 race season, Mercedes had reportedly seen similar behavior during pre-season testing.
• The team thought it had fixed a separate PU calibration problem discovered after the Belgian Grand Prix, only for a fresh gremlin to emerge at the Hungaroring.
• Despite salvaging seventh with competitive race pace, Russell said he has "never had a season like this" across his entire career and acknowledged he "definitely needs" the upcoming summer shutdown.

What's next:

Russell has demanded an internal review to rule out any driver-side procedures inadvertently contributing to the failures. Mercedes faces a race against time during the summer break to diagnose the root cause of its PU electronics issues and prevent further grid penalties or lost points. With the championship fight tightening, the team cannot afford to return from the break without concrete answers.