My GTI is not starting.

Hello, could be a situation where it does not see the transmission either in park or neutral - or for a manual transmission that it's not seeing the clutch pedal depressed. Could also be a situation where the start button has a concern. Could be a concern with low battery voltage - enough to turn the radio on, but not enough to start the vehicle. Could be a cabling concern, a starter motor concern. As you can see - many possibilities. But hands on testing will reduce those down quite a bit -- so seek local guidance near you! Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops