DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P2564
P2564 indicates the powertrain control module (PCM) has detected a low voltage signal from the turbocharger boost control position sensor circuit, meaning the sensor's output is below the expected range for the current operating conditions. The PCM monitors this sensor to determine the exact position of the variable geometry turbocharger (VGT) vanes or wastegate actuator, and a low signal prevents accurate boost control.
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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