Tesla Model 3 OBDII Adapter (2019-2023) – HRN-CT20T11


SKU: HRN-CT20T11 Categories: ,

Please note: This adapter is for 2019-2023 Tesla Model 3 ONLY. If you are looking for an adapter for the 2018 Model 3, please click here. This 2019+ Tesla Model 3 adapter may not be compatible for an early build (January/Feb) of the 2019 Model 3. You may need the 2018 Model 3 adapter. If your vehicle has an early 2019 build date, please see the image below to determine which adapter you require, or if you are uncertain, please contact us with a picture of your diagnostic port. To find the build date, please look at the sticker on the inside of the driver side door.


The HRN-CT20T11 is an OBDII adapter for the 2019-2023 Tesla Model 3 year, to connect to the Tesla OBDII engine diagnostics port. This harness may not be compatible with an early 2019 Model 3. 


Tesla Harness Install Video

If you are looking for an OBDII port adapter for the 2018 Tesla Model 3, you need to purchase the HRN-CT20T1. See the image below to verify the correct adapter. 

HRN-CT20T11 on the right vs HRN-CT20T1 on the left

HRN-CT20T1 on the Left vs HRN-CT20T11 on the right

Length: 30 cm / 12 inches

Max length of connected cables: 2 meters / 6.5 feet

Other Tesla Adapters

2012-mid 2015 Tesla Model S OBDII Adapter
Mid 2015+ Tesla Model S OBDII Adapter
Tesla Model X OBDII Adapter
2018 Tesla Model 3 OBDII Adapter
Overview of Tesla Adapters
Geotab Features for Electric Vehicles

Tesla Forum


Additional information

Weight 0.5 lbs
Dimensions 6 × 6 × 2 in