Understanding and Preventing Error Codes in Electric Vehicles

Understanding and Preventing Error Codes in Electric Vehicles
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Understanding the Error Codes

When a car suddenly stops working, it can be frustrating and confusing. This was the case for one driver who rented a brand new Tesla Model 3 from Hertz. After using the car for a week, they were driving to the airport when error codes started appearing on the dashboard display. The errors included "BMS_a107 Unable to charge," "BMS_a105 Vehicle may not restart," "BMS_a098 Unable to charge," and "BMS_a050 Unable to charge."

Several other drivers in an online forum tried to help diagnose the issue based on their experiences with similar problems. One suggested that it might be related to the 12v battery dying, which is a common issue in many cars. Another agreed but thought it could also be due to loose 12v terminal(s). A third driver pointed out that since the car was from Hertz, it's possible that the battery had been sitting unused for long periods of time, causing it to fail prematurely.

It's important to note that while these error codes may seem alarming, they are often caused by relatively minor issues such as a dead battery or loose connection. In fact, one driver shared their own experience with even more error codes appearing when their 12v battery died, yet they were still able to make two stops before taking their car to a service center for replacement.

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Potential Causes of Error Codes

While a dead 12v battery is a likely culprit for these types of errors, there are several other potential causes as well. For example, faulty charging equipment or software can cause charging-related errors like those seen in the Model 3 rental car. Additionally, wiring issues or damaged sensors can also trigger error messages and prevent the vehicle from starting or charging properly.

In some cases, these errors may be caused by user error rather than mechanical issues. For instance, if someone accidentally unplugs the charger mid-charge or tries to start the car without fully engaging the brake pedal, this can result in various warning messages being displayed on the dashboard.

Regardless of the specific cause of these errors, it's important for drivers to take them seriously and seek professional assistance if necessary. While some issues may be easy to fix at home (such as tightening loose connections), others require specialized knowledge and tools to diagnose and repair.

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Preventing Future Issues

To minimize the risk of encountering error codes like those experienced by the Model 3 renter, there are several steps drivers can take. First and foremost, regular maintenance is key. This includes checking fluid levels, inspecting belts and hoses, and ensuring all systems are functioning properly.

Additionally, it's important to follow proper charging procedures when using electric vehicles. This means using only approved chargers and cables, plugging in securely, and monitoring charging progress closely.

Finally, drivers should familiarize themselves with their vehicle's owner manual and pay attention to any warning lights or messages that appear on the dashboard. By staying informed and proactive about vehicle maintenance and usage, drivers can reduce the likelihood of experiencing unexpected breakdowns or malfunctions.


While encountering multiple error codes on a brand new car can be frustrating and concerning, it's important for drivers to remain calm and seek professional assistance if needed. In most cases, these errors are caused by relatively minor issues such as a dead battery or loose connection. However, they can also be indicative of more serious problems such as faulty software or sensors.

To prevent future issues from arising, it's crucial for drivers to stay on top of regular maintenance tasks and follow proper charging procedures when using electric vehicles. By doing so, they can enjoy reliable performance from their cars and avoid unexpected breakdowns or malfunctions.