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DTC codes / Volkswagen codes / P1554

P1554 · VolkswagenIdle Speed Control Throttle Position Missing Adaptation Conditions

P1554 on Volkswagen vehicles means the engine control module (ECM) cannot learn the throttle valve's closed and open limits because the idle speed control throttle position adaptation conditions are missing. The ECM expects to see specific throttle position sensor (TPS) voltages during key-on and idle, but the signal is absent or out of range, so it refuses to store the adaptation values needed for correct idle control.

SystemPowertrain
Code typeVolkswagen specific
SeverityMedium
Fix difficultyIntermediate
AreaVehicle speed, idle control and auxiliary inputs

Guidance is general and written for Volkswagen vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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