1. Introduction
This is generic alert for internal isolation and there could be many reasons for this alert. One of most common reasons could be water ingress inside high voltage battery pack, physical damages on high voltage battery pack etc.
In this 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 remote quick, easy and affordable support (Whats App +49(0)15226242038), 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.
Write message to us Whats App +49(0)15226242038. We will be happy to help you with affordable prices.
1.1 Why its important to have isolation in electric car?
High Voltage systems are mounted on car chassis. There must be a minimum electrical isolation/resistance in between High Voltage System and Car Chassis to ensure safe car operation.
There is monitor which is installed in battery, which measure periodically the resistance between the high voltage conductors and chassis.
1.3.1 Internal Isolation
Internal isolation is related to High Voltage Battery and possible code could be BMS_a123
- BMS_a123_SW_Internal_Isolation
1.4 What will happen?
2. How to Diagnose
This alert could come because of isolation issue. It need to check additional alerts to find out the exact cause of this alert. 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, you need support for diagnosis. Please contact us.
2.2 Remote Diagnosis
Please read more details about Remote Diagnosis in another guide (How to do, 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 do/perform isolation?
Please feel to contact us. We will be happy to provide you details.
How to read service alerts in Service Mode
- On the touchscreen, click Controls > 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.
Service > Battery > High Voltage
If everything is good. You will see green circles.
In case, if there is any High Voltage issue. You will see low resistance value and red circle.
Service Mode > High Voltage
In case, If you need support for diagnosis. Please Connect Us.
If you need support. 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, support for fixing if possible online support or to organize an appointment with independent affordable workshop.
Depend on alert/fault code, High Voltage Battery might need to be repaired/replaced.
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 read more details in another guide. Link
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?
3.2 Physical defect of the insulation material
There could be physical damage on high voltage battery.
3.3 Contamination
Contamination (of any size, e.g. dust, bolts, etc.), or water/moisture. One of most common reasons could be water ingress inside high voltage battery pack. Please have a detail look in another guide about Water Ingress/Moisture. Link
4.4 High Voltage Battery Repair
In case, if there is any water ingress. High Voltage battery pack need to open and repair. There are some special workshops who can perform such repairs.
You might need to repair/replace high voltage battery. Please read more details about it in another guide. Link
4.5 High Voltage Battery Replacement
In case, if there is any physical damages. You might need to replace high voltage battery pack. Please read more details about it in another guide (Battery replacement cost, how to do etc.). Link
Some of the other Hardware issue
Please send us your Service Alerts screenshot, video, Model, Year. Please describe issue as much as you can etc. We will be happy to help you. We will be happy to help you what could be other hardware issue.
Please feel free to Contact or Whats App +49 (0) 15226242038. We will be happy to help to fix alert.
3. Find and book best Workshop to fix Isolation issue
If you are looking for Workshop who is expert to fix such issue with best price. Please contact us with details in which country/city, are you looking for. Contact to Fix Isolation Issue
4. Alert Code
Some of most common possible alert code
- BMS_a123_SW_Internal_Isolation
- BMS_w123_SW_Internal_Isolation
- BMS_f123_SW_Internal_Isolation
BMS_f123
- BMS_f123_SW_Internal_Isolation
- The battery management system (BMS) detects that there is low high voltage isolation when pack contactors are opened.
- Potential Impact: Inability to charge
- BMS_w123_SW_Internal_Isolation
Please send us your "Service Alert" Screenshot via Contact or Whats App +49 (0) 15226242038. We will be happy to provide you support to fix/reset alert with affordable prices without going to service center which could save your money and time. We can help you to explain the possible cause, how to diagnose, how to fix/reset/repair etc.
Repair Estimate
Please feel to Contact Us or Call/Whats App +49 (0) 15226242038. We will be happy to provide you estimate and book an appointment for you in best affordable workshop.
Remote Support
In case, if you have any question or need any support/help. Please feel to contact us Contact Us or Call/Whats App +49 (0) 15226242038.
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
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For Repair Workshop Owner
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Frequently Asked Questions (FAQs)
Can I reset the alert?
It is recommend not do reset alert as long issue is not fixed.
Is it common issue?
Yes, it could happen on old battery packs if isolation will degraded due to water ingress.
Will cleaning be the solution?
It might not help.
What need to do?
Need to find out the exact cause of water leak and need to repair battery. There are some of common leakage points for particular battery packs. Please feel to contact us, we will be happy to help you for your battery pack common leakage points. If you do not find leakage point and fix it. It could happen again. It is really important to find leakage point and fix it to avoid repair again and save thousands of Euro/Dollars.
Can I do at Local Workshop, Independent Tesla Workshop?
Yes, you can. However, not every workshop can fix it. Only particular workshops has such skills and experience to fix it. Please feel to contact us. We will be happy to organize an appointment with our workshop partners with affordable prices. Please feel to contact us.
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 almost 5 to 10 thousands Euro/Dollars.
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
Case 1: One of our customer had BMS_f123 alert. He opened and checked the battery pack. Battery pack was dry. He contact us and we helped him remotely what could be the issue with the help of remote diagnosis.
Case 2: One of our customer with Model S (HV Pack Version 1) had BMS_f123 alert. He opened and found water ingress inside Battery pack. He repaired the issue. However, he was not able to clear the issue. He contacted us and we helped him remotely to fix it.
Car under warranty?
If your car is under warranty. It is recommended to contact OEM. Please read more details in another guide. Link
