Singapore GP: Rosberg urges Mercedes F1 team to improve reliability

The German was left stranded on the grid after his car refused to get out of neutral.

He took the start from the pitlane but then struggled for pace before retiring after a lengthy pitstop.

Meanwhile, team-mate Lewis Hamilton continued to lead the race, and the Briton will move into the championship lead by three points if he wins.

"It was just that the steering wheel didn't work and so the whole car wasn't working," said Rosberg.

"We need to find out what it is because again that's a reliability problem. We've had quite a few this year and that's our weakness.

"We need to get to the bottom of these things and make the car 100 per cent reliable.

"No point in shouting. It's reliability and it's happened again. As a team we really need to get to the bottom of it because it's happening to us too much.

"We need to get to the bottom of everything and understand what happened today."

Rosberg was starting from second place after losing out to Hamilton in the pole battle by just 0.007s.

"It's very, very tough. Also the way in which it happened, not even leaving the grid and everything. It was not good," added Rosberg.

"I was hoping that the team could still fix it, not once I was in the pitstop but before, because it was going on and off.

"Sometimes it was working, sometimes it was not working, so the hope was always there."