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


SKU: HRN-CT20T11 Categories: ,

Please note: This adapter is for 2019+ Tesla Model 3 and 2019-2021 Model Y* 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+ 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. This has been confirmed to work on the Tesla Model Y (2019-2021) as well,


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