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Battery health check

Tesla Model Y battery health check

How to read the high voltage battery of the Tesla Model Y with the BattGrade app: the adapter for your phone, where the port is, how the test runs and what the certificate shows.

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What you need

The adapter for your phone

Any one of these Bluetooth OBD2 adapters reads the Tesla Model Y. Choose one that works with your phone.

AdapterWorks with
OBDLink MX+Android · iPhone support coming

These cars are read only with the OBDLink MX+, through the Tesla cable: the adapter listens to the car's data, and ELM327 clones lack the commands it uses.

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Port location
Center console, through the cable
Cable
Tesla cable for the diagnostic connector
The test

How the test runs on the Tesla Model Y

A few minutes with the car switched on. The app only reads data: nothing is written to the car.

Before you start

Read only with the OBDLink MX+, through the Tesla cable; newer models can need a different cable. The car must be awake. The test only listens to the car's data and takes up to a minute.

  1. 01

    Wake the car

    The car must be awake, with the ignition on or in READY mode depending on the model. A sleeping car returns no battery data.

  2. 02

    Plug in and pair

    Plug the adapter into the OBD2 port and pair it with the BattGrade app over Bluetooth.

  3. 03

    Read the battery

    The app identifies the car from its VIN and reads the battery management system with read-only requests. Every request and response is kept with the test as raw data.

  4. 04

    Get the result

    BattGrade's server recomputes the result from the raw data, and the certificate is issued from the server's result, signed, with a QR code anyone can check.

State of Health

How the SoH of the Tesla Model Y is measured

The app can use these methods on the Tesla Model Y, in order of preference. The certificate names the method used and gives an uncertainty band in points either side of the score.

  1. 1

    Energy-based

    First choice

    The full-charge energy estimated from BMS data, divided by the usable energy of the same variant when new. Used only when the state of charge and the pack temperature allow a reliable estimate.

Validation

Where validation stands

Validation in progress

The app reads the Tesla Model Y today, and validation on real cars is in progress. This page will show when it is complete.

Either way, BattGrade's server recomputes every result from the raw data read from the car, and each certificate names its method and uncertainty band.

Read the methodology
The certificate

What the certificate shows

A certificate for the Tesla Model Y carries the same fields as the sample, filled in with the car's own data.

  • The State of Health (SoH), with the method behind it and an uncertainty band
  • A grade from A to F, on the same bands for every make
  • Warning signs, wherever the car provides the data
  • The name of the inspector who ran the test
  • Valid for 6 months from the day it is issued
See a sample certificate Download a sample certificate (PDF)
Read the methodology

Related models

Other Tesla Model 3 / Y, S / X 2021+ cars the app reads today.

See all readable models

Questions about the Tesla Model Y

Any one of these: OBDLink MX+. None of them works on iPhone yet.
Center console, through the cable.
The app can use these methods, in order of preference: Energy-based. The certificate names the method used and gives an uncertainty band.
Yes. The app reads the Tesla Model Y today, and validation on real cars is in progress.
A few minutes, with the car switched on. The app only reads data and writes nothing to the car.

Test Tesla Model Y batteries with BattGrade.

The Android app is in testing and the iPhone version comes next. Join early access and we will get you started.

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