The largest online repair guide library for every car

About us
Contact support
FAQ
Sign up
Sign in

2020 Model 3 Long Range not charging past 80% at Supercharger or home

0

Rachel A. · rep 0 · May 22, 5:25 AM · 1 replies · solved · Question

Vehicle: 2020 Tesla Model 3 Long Range

Hey everyone,

I've been having a strange issue with my 2020 Tesla Model 3 Long Range for the past few weeks. It seems like no matter where I charge, whether it's at a Supercharger or my home Wall Connector, the car consistently stops charging around 80-82%. It never reaches 90% or 100% anymore.

I've checked the charging limit in the car's settings and on the Tesla app, and it's definitely set to 100%. I've also tried restarting the car (scroll wheel reset) and even completely powering it off and on again, but the problem persists. I've also tried different Supercharger stalls and my neighbor's Wall Connector, with the same result.

Has anyone else experienced this with their Model 3? Could it be a software glitch, or something more serious with the battery or charging system? Any advice would be greatly appreciated before I schedule a service appointment.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:25 AM

0

ClearTheCode admin answer:

It sounds like you're experiencing a common, albeit frustrating, issue where your Tesla's Battery Management System (BMS) might be limiting the charge, or there's a calibration issue. Here are the steps and potential causes to consider:

  1. Verify Charging Limits: Double-check both the in-car display and the Tesla mobile app to ensure the charging limit is set to 100%. Sometimes, settings can revert or be overridden by profiles.

  2. BMS Calibration Cycle: The BMS can sometimes lose calibration, especially if the car is frequently charged to the same intermediate level (like 80%) without ever reaching 100% or dropping to very low levels. To recalibrate:

    • Charge your car to 100% (or as close as it will get).
    • Leave it plugged in for several hours after it reaches its 'full' state (e.g., overnight). This allows the BMS to balance the cells.
    • Then, drive the car until the battery is below 10-20%.
    • Repeat this full cycle (charge to 100%, discharge low) a couple of times.

  3. Software Update: Ensure your car's software is up to date. Tesla frequently releases updates that can address charging anomalies or improve BMS algorithms.

  4. Inspect Charging Port: Visually inspect your car's charging port for any debris, dirt, or bent pins that might be interfering with the connection. Also, check your charging cables for any damage.

  5. Environmental Factors: While less likely to cause a consistent 80% limit, extreme ambient temperatures can affect charging speed and efficiency.

When to See a Shop:

If the issue persists after attempting the BMS calibration cycle, verifying settings, and ensuring your software is current, it's time to schedule a service appointment with Tesla. While there isn't a generic OBD-II code for this specific scenario, Tesla's internal diagnostics will be able to pinpoint if there's an issue with the battery pack, a specific cell imbalance, or a fault within the charging control module. They can read proprietary fault codes and perform more in-depth battery health checks. Ignoring persistent charging issues could lead to further battery degradation or reduced range over time.

Menu

Help & account