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DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P259C
P259C 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 did not reach the expected feedback state within the calibrated time window. The PCM monitors actuator position or boost pressure feedback and sets this code when the response is too slow, meaning the turbo is not transitioning to closed-loop control as quickly as the software expects.
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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