Quote:
Originally Posted by cwbmw
Bumping for google index because there aren't too many online records of this issue:
2011 N55 335i coupe e92lci
- In my case, no change of engine bay sound at all.
- Half engine light when building boost above ~3k rpm.
- Loss of low end and high end power, degraded fuel efficiency
- Active DME codes (need bmw specific scanner to read):
2C57 - Charging pressure control, plausibility Pressure too low.
387F - Power management: Standby current violation.
- Replaced the pressure converter:
Genuine BMW - 11747626351 - Pneumatic Wastegate Actuator
- Issue resolved, full boost restored.
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Quote:
Originally Posted by norsairius
I had this issue come up a while ago. Check engine light that would come on at seemingly random times, but mostly when accelerating on to highways. Car never actually felt weak though. Pulled codes and 2C57 came up for charge pressure too low. Took it to the dealership and they found that the issue was a kinked EPKS hose to the valve cover. It was an easy/cheap fix. Happened at ~47.5k miles, now at ~60k.
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Mine also comes on randomly... Usually once a day and then after I clear it, no issues. Can usually go WOT and full boost but at highway speeds and a quick over 3k for lane switch I'll get the 2c57 code and half engine light. Might just try the pneumatic wastegate actuator, is there any specific way to diag it? or just replace and pray.