You are using a cheap "cloned" ELM327 interface with a faulty or unbranded chip.
Different FCA vehicles use different pins and speeds. Here is the 2021 cheat sheet:
If you installed drivers in 2021 but got an "Error 10" in Device Manager, you must disable Windows Driver Signature Enforcement (Shift + Restart → Troubleshoot → Startup Settings). multiecuscan elm327 port settings 2021
Set this to 38400 or 115200 . (38,400 is the standard for classic ELM327 chips, while high-quality modified interfaces support 115,200). Data bits: 8 Parity: None Stop bits: 1 Flow control: None
Expand and double-click your USB Serial Port . You are using a cheap "cloned" ELM327 interface
Windows assigns a virtual COM port number to your ELM327 interface upon connection. You must locate this number to configure both Windows and Multiecuscan properly.
To help you get your vehicle diagnostics up and running smoothly, tell me: What specific are you trying to scan? Set this to 38400 or 115200
Need more help? Post your exact ELM327 version and MES error code below.