Issue with receiving of Serial Data

[michaelschwrz]

Hi guys,
I´m currently working on a school project where I want to receive a cars CAN-Bus data via the OBDII-port using a Bluetooth adapter and a ESP-WROOM-32E. I´m using PIO with VS-Code which worked great on a ESP32 Development Board. But I have decided to make my own custom PCB. After soldering everything together and checking the connections and stuff I decided to test the circuit board uploading a short sketch. Unfortunately the message: “A fatal error occurred: Failed to connect to ESP32: No serial data received.” popped up. I did some research and found that it might have to do with the bootloader which isn´t being selected right. Is there anything I can do to solve this problem? I tried to manually get it into the right bootloader mode by connecting GPIO0 to GND with a jumper wire and then tapping the EN-Pin onto GND but It didn´t help. Do you guys have any Idea what I could do?

Kind regards,
Michael

I attached some screenshots of the schematics if they help in any way:

[Sprite]

What color is D6? (And yes, this is relevant.)