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2018 Model 3 Long Range: Slower Charging & Reduced Range

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Nicole W. · rep 0 · May 22, 5:29 AM · 1 replies · solved · Question

Vehicle: 2018 Tesla Model 3 Long Range RWD

Hey everyone,

I've been noticing some concerning behavior with my 2018 Tesla Model 3 Long Range RWD lately. For the past few weeks, charging at Superchargers seems significantly slower than it used to be, even when the battery is low. I'm talking about getting much lower kW rates than I typically would, and it takes longer to reach my desired charge level.

Additionally, I've observed a noticeable drop in my estimated range. My full charge used to show around 310 miles, but now it's consistently closer to 280-290 miles, even after balancing the battery. I've tried different Superchargers and my home Wall Connector, and the issue persists across all of them.

Has anyone else experienced similar problems with their early Model 3? Could this be a battery degradation issue, or something else entirely? I'm trying to figure out if this is normal aging or if there's a specific component failing. Any advice on what to check or if this warrants a service appointment would be greatly appreciated.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:29 AM

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ClearTheCode admin answer:

It sounds like you're experiencing a combination of reduced charging speed and range degradation, which are common concerns for owners of older EVs. Here's a breakdown of potential causes and steps you can take:

  1. Battery Degradation:

    • Cause: All lithium-ion batteries degrade over time and with use. Factors like age, number of charge cycles, frequent fast charging, and exposure to extreme temperatures can accelerate this. A 2018 Model 3 would naturally show some degradation.
    • Diagnostics: Tesla's service mode (accessible via the car's touchscreen) can sometimes provide battery health metrics, though it's not always a clear percentage. You can also monitor your 'Rated Range' over time.

  2. Software Updates:

    • Cause: Tesla frequently releases software updates that can optimize battery management, charging algorithms, and range calculations. Sometimes, an update might temporarily affect perceived range or charging speed as the system recalibrates.
    • Action: Ensure your vehicle's software is up to date. Check for any pending updates in the 'Software' section of your car's display.

  3. Charging Port/Connector Issues:

    • Cause: While less common, a faulty charging port or internal connector could restrict power flow, leading to slower charging.
    • Diagnostics: Visually inspect your charging port for any debris, corrosion, or damage. Try using a different charging cable if possible, though this is less likely to be the issue if it's happening at Superchargers too.

  4. Battery Management System (BMS) Recalibration:

    • Cause: The BMS can sometimes lose calibration, leading to inaccurate range estimates.
    • Action: A full charge to 100% and then driving down to a very low state of charge (e.g., 10-20%) before recharging to 100% can sometimes help recalibrate the BMS. Do this a few times if possible.

  5. When to See a Shop:

    • If the range loss is sudden and significant (more than 10-15% over a short period), or if charging speeds are drastically reduced across multiple Superchargers and home charging, it's advisable to schedule a service appointment with Tesla.
    • They can perform a deeper diagnostic check on your battery pack's health, individual cell voltages, and charging system components. They can also check for any specific diagnostic trouble codes (DTCs) that aren't visible to the user.
    • While there isn't a specific OBD-II code for general battery degradation in Teslas, their internal diagnostics can pinpoint issues.

It's important to remember that some degradation is normal. However, if it's impacting your daily usability, a professional diagnosis is the best next step.

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