DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P2587
P2587 indicates that the powertrain control module (PCM) has detected an out-of-range or performance fault in the circuit for the turbocharger boost control position sensor B. This sensor reports the actual position of the variable geometry turbo (VGT) vanes or wastegate actuator, and the PCM compares that signal against expected values to verify proper 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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