Tesla BMS_w172 Vehicle may not restart guide to fix

Tesla "BMS_w172 Vehicle may not restart" Guide to fix

1. Introduction

This is generic alert and there could be many reasons for this alert. In this free guide, you will get information about how to diagnose the exact cause of this alert, what could be the reasons for this alert, how to fix it, How much it could cost to fix the alert, How to get online support, Find and compare best affordable workshop in your region and book an online appointment to fix alert, Information about spare part number and name. You could also buy new and used spare parts with best price etc.

BMS_w172 is an external isolation warning alert. One of High Voltage components (excluding high voltage battery) has too little resistance between HV Components and chassis ground.  

In most of cases, it could be issue with battery coolant heater, Large Drive Unit, A/C Compressor, Fuse etc. however other HV Components could be faulty. 

The best way would be to perform isolation testing to find out the exact faulty components.

Tesla BMS_w172 Vehicle may not restart guide to fix

2. How to Diagnose

This alert could come because one or more system/feature is disabled/faulty. The exact cause of this alert could be diagnosed with the help additional alerts.

2.1 How to check additional alert

It could be possible to find out exact cause via Remote Diagnosis, Service Mode. In case, if you need support to check additional alerts. Please Connect Us

2.2 Remote Diagnosis

The exact cause of the alert could be diagnosed via Remote Diagnosis. Please read more details about Remote Diagnosis in another guide (How it work, Cost etc.) Link If you need support. Please Contact Us Phone/Whats App +49(0)15226242038

2.3 Service Mode

It could be possible to find out the exact cause of the alert with the help of services alerts in Service Mode.

How to check service alerts in Service Mode

  • On the touchscreen, click Controls (vehicle icon) > Software
  • Touch and hold the large word "MODEL" for 4 seconds and then release.
  • Enter "service" as access code.
  • After clicking on Service Alerts. You can read service alerts. If there is anything wrong with car. It will show in active alerts.

Please read more details in another guide (How to do enable Service Mode) Link

In case, If you need support for diagnosis. Please feel to Connect Us or Whats App +49 (0) 15226242038

Please send us "Service Alert" Screenshot via Contact or Whats App +49 (0) 15226242038. We will be happy to help you to explain alert and how could be fixed, cost, online support to fix alert, organize an appointment with best independent affordable workshop.

Depend on alert/fault code, car might need to be repaired/serviced.

3. How to Fix it

Some of alert could come because of software bugs. Some of alert could resolve after restarting the system, software update/reinstall. To fix some of alerts, car might need hardware repair.

3.1 Restart System

Some of alert could resolve after restarting the touchscreen or power of the car.

Restart Touchscreen

Firstly, you could try with soft reset (restart touchscreen)

How to restart soft reset (restart touchscreen)

  • Please shift car into park.
  • Hold down both scroll buttons on the steering wheel until the touchscreen turns black.
  • Please wait approximately 30 seconds for the touchscreen to restart.

 Please read more details in another guide (how to do). Link

Powering Off the Car

If soft reset (restart touchscreen) have not resolved the alert/issue. You could try hard reset (Powering Off the car).  

  • Please shift car into park
  • On the touchscreen please touch Controls > Safety > Power Off
  • Please wait for at least for two minutes without interacting with the car. Please do not open the doors, touch the brake pedal, touch the touchscreen etc.
  • After 2 minutes, please press the brake pedal or open the door to wake the car (Source Tesla)

3.2 Software issue

Some of alert could be related to software issue.

Software Bug and Glitches

One of reason could be problem with software bug and glitches. Did you get this alert after updating recent software version? If yes, it could be related with software bug and could resolve with future software update. Please send us Service Alert screenshot. So we will inform you if it could be related to software bug. Link

Firmware not updated

One of main reasons could be that firmware is not updated. Have you checked recent update and updated to recent version? If not, we recommend you to do that. Please make sure that the car latest software version. Please read more details in another guide. Link

3.3 Hardware Issue

There could be some hardware issue/faulty. Some of common hardware issues could be followings:

Recent Repair/Service

Did this alert pop up after recent repair/service? If yes, please let us know which repair/service was done recently. Some alerts could pop up if repair/service is not done in proper way. If system/alert has not be reset. Did you use aftermarket/used part?

External Isolation

In most cases, it could be issue with External isolation. Please read all details about external isolation in another guide (How to diagnose, cost, workshop who can perform such tasks etc) Link

Coolant Heater

One of reason could be that coolant heater. Please check more details about possible alert code, how to check, how to repair etc in another guide. Link

AC Compressor

Please check out more details about about A/C Compressor repair. Link

Fuse

One of reason could be that fuse is blow up.

Drive Unit

In case if you have Model S/X with Large Drive Unit. It could be issue with coolant leakage.

Cost

Cost could vary depend on issue, type of workshop, location. If you are looking for online support or affordable independent workshop. Please free to contact us or have a look in Price List

Online Support

In case, if you have any question or need any support/help. Please feel to contact us Contact Us or Whats App +49 (0) 15226242038

Find, compare and Book workshop to Fix it

If are you looking for best workshop who is expert to fix such issue with good price. Please contact us we will be happy to organize an appointment with workshop or find, compare and book best workshop in Workshop Locator

Book an Appointment

If you would like to book an appointment.

Book an Appointment to Fix an affordable Workshop

Buy New/Used Spare Parts

If you would like to buy spare parts. Please have a look in our catalog or Contact Us Phone/Whats App +49(0)15226242038

Alert Code

Possible alert code

1. BMS_w172

BMS_w172_SW_Drive_Iso_Warning

"The battery management system (BMS) has detected low isolation conditions during multiple drive cycles".

BMS_w172_SW_Drive_Iso_Warning

2. BMS_u008 and BMS_w172 together alert

In case if you have Model S/X and got BMS_w172 together with BMS_u008. In most cases, it could be issue with Coolant Heater, Compressor, Fuse

Tesla BMS_w172 BMS_u008 Guide to fix

Please send us "Service Alert" Screenshot via Contact or Whats App +49 (0) 15226242038. We will be happy to help to fix alert.

Donation/Support

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For Repair Workshop Owner

If you car repair workshop owner and would like to add your workshop in our list. Please contact us.

For Car Mechanic

There are some car owner who like to buy spare parts from OEM or Aftermarket and prefer to do Mobile Service, DIY or need support. If you would like to offer this services to car owner in your region. Please contact us

Comment

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Frequently Asked Questions (FAQs)

Can I do at Local Workshop, Independent Tesla Workshop?

Yes, you can. However, please make sure that workshop knows how to work to Tesla Cars. If local workshop need any support. Please feel to contact us. We will be happy to provide online shop. You can also find workshop in our Workshop Locator.

Can I do it/repair yourself/myself (DIY)?

Some of repair could be done at DIY. In case, if you needed Tools, Know-How, Time etc. Please feel to contact us. We will be happy to provide you online support. 

Note: Please do not work with high voltage components. If you do not need needed/proper Tools, Know-How etc. It could be dangerous.

Mobile repair service?

In some of cases, we could also provide mobile services. Please feel to contact us where are you located and what kind of repair are you looking for.

Car not under warranty, salvage, accident, flood, modified cars?

It is highly recommended to perform repair with independent workshop to save money.

Car under warranty?

In case if your car is under warranty. It is recommended to perform certain repair works (HV Components, ADAS etc) with OEM during warranty period. Wear and Tear Part Repair could be done with independent workshop to save money. Please read more details in another guide. Link 

Alert still appearing after repair?

There could be many reasons. Some of reasons could be please make sure that repair was done in correct way, did you restart system after performing repair? did you Reinstall Firmware? Still appearing alert: Please free to Contact Us. We will be happy to provide you online support. Phone/Whats App +49(0)15226242038

 

 


 

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Disclaimer: Tesla, Inc. was not involved in the creation of this document. Tesla did not provide us any info. Tesla did not edit, review or authorize us. We gather this information from Tesla official website and other resources.

Note: It is your responsibility to double check and confirm that the procedures/info mentioned in this blog are applicable to your specific car before performing them. Please contact us or our workshop partner to make sure/confirm. We will be happy to help you.