Tesla "Maximum battery charge level reduced" Guide to fix it (BMS_u018)

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.

1.1 What does this alert says?

Car will be able to drive and charge. However, it will not able to charge maximum level (100%).

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?

Faulty Components

There could be problem with Battery Cells, Battery Module, BMB Board etc.

3.4 Battery Cells

In most of cases, there could be problem with one or two cells are out out of order inside the Battery Module. It is possible to change/repair only those broken cells module. However, its not highly recommended to change/repair cells individually. If one cell is broken, it could be that another cell is about run-down soon.

It is recommend to replace High Voltage Battery. Please check out more details about Battery replacement in another Guide (How much it cost, how to do, buy used and new battery, find compare & book best affordable workshop to replace battery etc.) Link

3.4.1 Battery Cells repair Cost

It could cost from $3500. Cost can very depend on how many module need to change, type of workshop, location etc. If you are looking for workshop who offer such services with good prices. Please contact us.

3.5 BMB

Please check out more details in another guide. Link

3.6 High Voltage Battery Replacement

If you would like to replace High Voltage Battery. Please check out more details about Battery Replacement in another Guide (How much it cost, how to do, buy used and new battery, find compare & book best affordable workshop to replace battery etc.) Link

4. Cost

Cost could vary depend on issue, type of workshop, location. If you are looking for online support or affordable Tesla independent workshop. Please feel to Contact Us or Call/Whats App +49 (0) 15226242038. Please have a look on common repair prices Price List

Cost could very depend on issue and lot of factors. However, it could cost 3,500 - 15,000. It is highly recommend to repair battery with high voltage battery repair specialist shop. If you are looking for one shop. Please contact us with Service Alert screenshot and in which region/city/country are you looking for.

5. Workshop to Fix BMS Alerts

If you are looking for Best Affordable workshop, who are expert to fix such battery issues. Please Contact Us.

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

Book an Appointment

If you would like to book an appointment.

Book an Appointment to Fix an affordable Workshop

Alert Code

Some of most common possible alert code.

You might have received one of following alert.

1. BMS_u018

  • BMS_u018_SOC_Imbalance_Limiting
Tesla Maximum battery charge level BMS_u018
What does this alert mean?

It indicate that there is an imbalance within the battery. It means that one or more battery bricks have lower or higher capacities as compared the way it should be.

How to diagnose

Cell Voltage: It is possible to check cell voltage with the help you ScanMyTesla App.

2. BMS_u029

BMS_u029

Tesla Maximum battery charge level BMS_u029 How to Fix, Cost

3. BMS_u025_Brick_Voltage_Limit

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 clear the Code?

Please do not clear until issue got repaired/resolved. If you clear the alert in toolbox. It will appear again as long as issue is not repaired.

Which workshop can fix the issue with affordable prices?

Please contact us in which country/city, you are looking for repair.

What is Brick?

Brick is group of cell in Module.

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.