DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P259D
P259D indicates that the powertrain control module (PCM) commanded the turbocharger's variable-geometry or wastegate actuator to enter closed-loop boost control, but the system failed to reach the expected feedback state within the calibrated time window. The PCM monitors the turbocharger boost control position sensor and compares actual actuator movement against the commanded target, and it sets this code when the response is too slow or absent.
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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