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DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P2590
P2590 means the engine computer has detected an intermittent or erratic signal from the turbocharger boost control position sensor B circuit, which monitors the vane or wastegate actuator position. The computer expects a smooth, predictable voltage change as the turbo boost is commanded, but instead sees the signal jump, drop out, or fail to correlate with the commanded position.
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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