Williams' Spanish GP winner Pastor Maldonado will start from 22nd position on the grid in Canada, after being hit by a five-place penalty for changing his gearbox overnight.

The gearbox was damaged in the same accident that wrecked his final flying lap attempt in Saturday's qualifying session for the F1 Grand Prix of Canada. when Maldonado carried too much speed into the final chicane and ended up clouting the back of the Williams into the Wall of Champions.

Although Maldonado was able to control the car from making any further impacts with the wall, the accident brought out a yellow flag at the very end of the second part of qualifying. That thwarted anyone else on a late lap trying to squeeze into Q3 and inadvertently helped Jenson Button keep his top ten position on the grid.

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But the initial impact together appears to have left the Williams' gearbox with too much damage to be risked in Sunday's Grand prix and the team have swapped it out last night, automatically incurring a five-place penalty as a result.

Maldonado also got served with a gearbox penalty at Monaco following a collision with Sauber's Sergio Perez in final practice; on top of that he was penalised a further ten places for causing the avoidable collision in the first place.

That put him on 24th place at the back of the grid in Monaco, and now in Canada he will start only one row further forward in 22nd.

The formal notice from the Montreal stewards states that as "the driver [Maldonado] did not use the gearbox for five consecutive events," the overnight change was a technical breach of Article 28.6 a) of the FIA Formula One Sporting Regulations and thereby incurred the drop of five positions.