McLarenThe Briton retired from the race on lap 32 in what was a blow to his championship hopes, which had been invigorated by his victory at Spa the previous weekend.
Technical director Paddy Lowe revealed on Wednesday it had taken the team a long time to find the cause of the issue, which was in the fuel pump.
Lowe said the team had taken the necessary measures to make sure the failure does not happen again
"It wasn't an easy problem to identify, and not one we have ever seen before," said Lowe during a Vodafone phone-in on Wednesday.
"We're very disappointed about it actually, it was really gutting to see that car roll to a stop at Monza. We have fortunately managed to identify the root cause.
"It was a problem with the fuel pump. It is something we will have completely covered for the remaining races."
After his retirement at Monza, Button is 78 points behind championship leader Fernando Alonso.
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