Vacuum issue major loss in power - please help!

[Rickzg]

Hi guys, Im hoping someone can help me. Last week I had my car on the dyno, it is a stock 2012 m5 no tune and only an akra cat back exhaust. The car kept going into limp mode at 6k rpm and only making 460bhp crank.

The only error displaying was "120908 Charging pressure control, switch off: pressure build up blocked", the exhaust vacuum pipes are connected and the car drives fine. I have only had the car for 2 months so I am guessing it has been low on power since i purchased it. The garage says the wastegates are not opening fully, and suggest I change the vacuum pressure valves, has anyone had a similar problem to this??

Please help!

[gary_F10M5]

Originally Posted by Rickzg

Hi guys, Im hoping someone can help me. Last week I had my car on the dyno, it is a stock 2012 m5 no tune and only an akra cat back exhaust. The car kept going into limp mode at 6k rpm and only making 460bhp crank.

The only error displaying was "120908 Charging pressure control, switch off: pressure build up blocked", the exhaust vacuum pipes are connected and the car drives fine. I have only had the car for 2 months so I am guessing it has been low on power since i purchased it. The garage says the wastegates are not opening fully, and suggest I change the vacuum pressure valves, has anyone had a similar problem to this??

Please help!

I had the same issue with low boost. Turns out the akra vacuum actuators at the rear were faulty and leaking vacuum pressure. Disconnect and Seal the lines with a screw or tape. Should do the trick.

[Rickzg]

Really?? I will give that a shot!

[Teezus91]

i had the same issue, changed the actuators and everything was fine.