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Strange noises from under the bonnet? Spooky. Happy Halloween from Auto Veteran: may your only scares be costumes.
DTC codes / P04xx · Auxiliary emission controls / P0459
P0459 means the powertrain control module (PCM) commanded the evaporative emission (EVAP) purge control valve to open or close, but the voltage on the valve's control circuit stayed higher than expected. The PCM monitors the purge valve circuit for a short to voltage or an open return path, and it sets this code when the commanded state and the observed voltage do not agree.
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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