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DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P2598
P2598 means the engine computer has detected that the turbocharger boost control position sensor A is reporting a stuck-low signal, meaning the sensor's output voltage remains below the expected range even as the computer commands the turbo actuator to move. The computer compares the commanded boost control position with the actual sensor feedback and flags this code when the feedback never rises above a minimum threshold during a self-test or normal operation.
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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