Volkswagen Tiguan electrical system shuts down in high temperatures but functions normally when cool on Volkswagen Tiguan

Some Volkswagen Tiguan owners report experiencing electrical system shutdowns in high temperatures, while the system functions normally when cool. This issue may be linked to an intermittent "Terminal 15" relay, which controls the +12V power to much of the electrical system and is typically found in the fuse/relay panel under the dash. Additionally, some owners note problems with the timing system, particularly with the timing chain tensioner, which is prone to failure and can cause rattling or misfiring while idling. Recognizing these signs and understanding their causes is essential for timely resolution, potentially saving owners from further complications and expenses.