Carbon buildup or sludge on the throttle plate and bore, restricting movement; Faulty throttle position sensor (TPS) or its wiring; Sticking or binding throttle valve due to worn linkage or return spring; Damaged or misadjusted throttle cable (on older cable-operated systems); Failed electronic throttle control (ETC) actuator or motor; Corroded or damaged electrical connectors at the throttle body; ECM software issue or internal fault (less common)

DTC codes / Volkswagen codes / P1568

P1568 · VolkswagenIdle Speed Control Throttle Position Mechanical Malfunction

Q: What does code P1568 mean?

Idle Speed Control Throttle Position Mechanical Malfunction. P1568 on Volkswagen vehicles indicates that the engine control module (ECM) has detected a mechanical malfunction in the throttle position system that is used for idle speed control. The ECM monitors the throttle valve position and expects it to move to a specific angle during idle control, but the actual position does not match the commanded value within the allowed tolerance.

P1568 on Volkswagen vehicles indicates that the engine control module (ECM) has detected a mechanical malfunction in the throttle position system that is used for idle speed control. The ECM monitors the throttle valve position and expects it to move to a specific angle during idle control, but the actual position does not match the commanded value within the allowed tolerance.

SystemPowertrain

Code typeVolkswagen specific

SeverityMedium

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

Symptoms you may notice

Illuminated check engine light, often with no other symptoms
Unstable or fluctuating idle speed
Engine may stall when coming to a stop
Hesitation or stumble during acceleration from idle
Reduced engine power or limp mode in some cases

Common causes, most likely first

Carbon buildup or sludge on the throttle plate and bore, restricting movement
Faulty throttle position sensor (TPS) or its wiring
Sticking or binding throttle valve due to worn linkage or return spring
Damaged or misadjusted throttle cable (on older cable-operated systems)
Failed electronic throttle control (ETC) actuator or motor
Corroded or damaged electrical connectors at the throttle body
ECM software issue or internal fault (less common)

How to diagnose and fix it

Scan all modules for stored codes and freeze-frame data to confirm the fault conditions
Visually inspect the throttle body for carbon buildup and clean it with approved throttle body cleaner
Perform a throttle body adaptation or relearn procedure using a diagnostic scan tool
Check the throttle position sensor signal with a multimeter or oscilloscope for smooth operation
Inspect wiring and connectors between the throttle body and ECM for corrosion or damage
Test the electronic throttle actuator for proper movement and resistance
If all else fails, replace the throttle body assembly and re-adapt

Common Misdiagnosis Traps for P1568

A dirty throttle body is the most frequent cause, but many technicians replace the entire unit before attempting a thorough cleaning and adaptation.
The code can be set by a weak battery or charging system issue that causes the ECM to lose its learned throttle position values.
After cleaning or replacement, a throttle body adaptation is mandatory; skipping this step will cause the code to return immediately.
On some Volkswagen models, a faulty brake light switch or clutch switch can interfere with idle control and trigger this code indirectly.
The throttle position sensor may test fine with a basic multimeter but still have intermittent dropouts that only an oscilloscope can reveal.

Can I keep driving with P1568?

You can usually drive the vehicle to a repair shop, but avoid aggressive acceleration and be prepared for possible stalling at idle. If the engine stalls frequently or enters limp mode, stop driving and seek professional assistance.

Tools that help

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