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Strange noises from under the bonnet? Spooky. Happy Halloween from Auto Veteran: may your only scares be costumes.
DTC codes / P05xx · Vehicle speed, idle control and auxiliary inputs / P05FD
P05FD means the powertrain control module has detected that the temperature of the turbocharger or supercharger boost control system, specifically circuit or actuator 'A', has exceeded its safe calibrated limit. The computer is not reporting a generic engine overheat; it is flagging that the boost control hardware or its temperature sensor circuit is running hotter than the manufacturer designed for, which can lead to boost control failure or forced limp mode.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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