Webbers ECU had 'siftware-related issue', result of investigation
After the Australian driver had a bad start in Melbourne and also a KERS problem, team boss Christian Horner said: "You need to ask McLaren why the ECU didn't work".
A new unit for 2013, in preparation for the radical new V6 engine rules next year, caused several problems in recent winter testing.
"You can also inflict ECU problems on yourself by how you set it up, but I will look into it," he said.
The Woking based company admitted there was a "software-related issue" with Webber's unit.
"That disrupted his preparations for the start of the race, for which Mark and the team has our apology. We are working together with them to prevent any recurrence," said McLaren.