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P0234 - Turbocharger/Supercharger A OVERBOOST Condition

WARNING: This page is about a different car, the 2012 Ford Pickup, 2012 Ford F550 Super Duty, 2012 Ford F450 Super Duty, and 2012 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
P0234 - TURBOCHARGER/SUPERCHARGER A OVERBOOST CONDITION

Description:  This DTC sets if the indicated boost pressure is greater than the desired boost pressure value by more than a calibrated threshold.
Possible Causes: 
  • The manifold absolute pressure (MAP) sensor is out of range high
  • Wastegate control hose open or plugged
  • Damaged turbocharger wastegate regulating valve (TCWRVS) solenoid
  • Damaged wastegate adjusting rod
  • Incorrect wastegate adjustment
  • Turbocharger actuator or vanes sticking
Diagnostic Aids:  The presence of this DTC may indicate that the vehicle is operating in derate mode and may experience a loss of power.
Check the vacuum hoses between the turbocharger wastegate regulating valve solenoid and the turbocharger wastegate actuator for leaks and obstructions.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to PINPOINT TEST KA .
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