Lewis Hamilton will start from the back of the grid at the Chinese Grand Prix after his Mercedes W07 Hybrid developed a problem with the Energy Recovery System in qualifying.
Hamilton, who completed only an installation lap in the damp final practice session, detected the problem on his out lap and returned to the pits.
Hamilton ventured back on track but Mercedes was unable to repair the problem and he recovered to the pit lane, leaving him unable to set a time.
Hamilton will therefore start the race from 22nd place on the grid.
"As soon as I went out [I noticed it] it’s unfortunate, the best thing we can do is learn from it," he said.
"The guys will be as gutted as I am, it’s a case of figuring the issue out and making sure it doesn’t happen again to either of the cars."
Hamilton started from the back of the pack in Germany and Hungary two years ago and on both occasions was able to recover to the podium positions.
However, the Briton has downplayed his chances of repeating such a comeback in China.
"You can overtake here, [but the] tyres don’t last as well, so perhaps it won’t be as simple as it was in that race but I’ll give everything I’ve got, it’s not over until it’s over," he said.
"[The car is] quick, so hopefully they get the issue fixed so we can have a race tomorrow."