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If your Volkswagen Golf GTI's check engine light comes on, it is important to pull over right away to avoid any potential damage to the engine or other parts. Once you have safely stopped, use an OBD II scan tool to check the ECU for the issue. If you see a code P173400, it indicates a problem with the starter selector level sensor, meaning it has detected an abnormality with the starter. This is often caused by a faulty mount or sensor. Check your starter and its components to ensure everything is in proper working order.
The code P173400 on a Volkswagen Golf GTI points to a problem with the sensor that detects the position of the gear selector.