Code P1227 Wastegate Failed Closed (Over Pressure) - What's it mean?

[Streetpwr281]

I've had the dreaded wrench light twice in the past 3 weeks. Power instantly cut and I can only limp the car to safety. Both times after turning car off and back on the light is gone and the car runs fine. Each time I was lower rpms ~ 3000rpm and had just attempted to accelerate moderately to pass.

Any ideas what to check?


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[Snoopy49]

P1227 - Wastegate Failed Closed (Over Pressure) Description:

This DTC sets when the boost pressure is continuously higher than desired.

Possible Causes:
Exhaust gas recirculation (EGR) valve
Mass airflow (MAF) sensor
Manifold absolute pressure (MAP) sensor
Supercharger bypass actuator stuck closed
Supercharger

Diagnostic Aids:
This DTC is informational only and may be accompanied by other DTCs. Diagnose other DTCs first.

Application
Key On Engine Off
Key On Engine Running
Continuous Memory
All
GO to Pinpoint Test KJ.

KJ Supercharger Bypass Control.pdf

 

[Streetpwr281]

Well that's a list to diag. Car runs fine otherwise only on these 2 occasions did it throw wrench light. I've got a Whipple 2.9L so the bypass valve / bypass valve actuator are also Whipple not OEM correct?


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[Streetpwr281]

Consensus is my bypass valve actuator is sticking. Need to replace.


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