One problem related to gas recirculation valve (egr valve) has been reported for the 2012 Volkswagen Passat. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2012 Volkswagen Passat based on all problems reported for the 2012 Passat.
On my 2012 tdi when the weather gets cold ~ below 10 degrees fahrenheit the engine feels like it is misfiring. It usually starts fine, but it stumbles/misfired for the first mile or so. The car does not want to get up to speed, nor will it shift into the next gear, the engine will rev to 3000 rpm and more when cold, which is very bad for the engine. I will manually shift into the next gear and then it chugs and misfires and struggles to get up to speed.