What does code P1559 mean?

Q: What does code P1559 mean?

Idle Speed Control Throttle Position Adaptation Malfunction. P1559 on Volkswagen vehicles means the engine control module (ECM) cannot complete the idle-speed adaptation of the electronic throttle position sensor, so the learned idle position is outside the expected range. The ECM monitors the throttle valve's closed and spring-loaded reference voltages during the idle adaptation routine and flags this code when the values do not fall within the programmed limits.

DTC codes / Volkswagen codes / P1559

P1559 · VolkswagenIdle Speed Control Throttle Position Adaptation Malfunction

P1559 on Volkswagen vehicles means the engine control module (ECM) cannot complete the idle-speed adaptation of the electronic throttle position sensor, so the learned idle position is outside the expected range. The ECM monitors the throttle valve's closed and spring-loaded reference voltages during the idle adaptation routine and flags this code when the values do not fall within the programmed limits.

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.