Hacking Tesla's New TCU: Installing a Local SIM Card
2025-05-12
Tesla's newer models (Model 3 Highland, Model Y Juniper, and Cybertruck) have relocated their cellular modem to a separate Telematics Control Unit (TCU). This guide details how to access and replace the SIM card in the TCU, activating it using Tesla Toolbox and Service+ mode to achieve 4G/5G connectivity. It covers TCU location, SIM installation, using a VPN for region restrictions, and waking the car with an external SIM.
Hardware
SIM card