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Reduced Range & Slower Supercharging on my 2018 Model 3 Long Range

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Tom H. · rep 0 · May 22, 5:29 AM · 1 replies · solved · Question

Vehicle: 2018 Tesla Model 3 Long Range

Hey everyone,

I've noticed a significant drop in my available range lately on my 2018 Tesla Model 3 Long Range. When it was new, I could easily get over 300 miles on a full charge, but now it's showing closer to 260-270 miles, even after a 100% charge. It feels like the battery isn't holding as much as it used to.

Also, I've observed that Supercharging sessions seem to be taking longer than they did a year or two ago. The peak charging rate doesn't seem to hit as high, and it tapers off much quicker. I'm wondering if this is normal battery degradation or if there might be an underlying issue.

Has anyone else with an older Model 3 experienced this? Is there anything I can do to check the battery health more accurately, or any settings I should be looking at? I'm trying to figure out if this is just part of owning an EV for a few years or if I should be concerned about a potential problem with the battery pack itself.

✓ Accepted solution

ClearTheCode Admin

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

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ClearTheCode admin answer:

It's common for electric vehicle batteries to experience some degradation over time, leading to reduced range and potentially slower charging speeds. However, significant or sudden changes warrant investigation.

Here's what could be happening and what to do:

  1. Normal Battery Degradation:

    • Cause: Lithium-ion batteries naturally lose capacity with age and charge cycles. Factors like frequent Supercharging, consistently charging to 100%, and extreme temperatures can accelerate this. A 10-15% degradation over 5-6 years is not uncommon for early Model 3s.
    • Action: Monitor your battery health via the Tesla app or service menu (if available). Ensure you're following best practices for battery care, such as daily charging to 80-90% and only charging to 100% when needed for a long trip.

  2. Software Optimization:

    • Cause: Tesla frequently updates its battery management system (BMS) software. Sometimes, these updates can recalibrate the reported range or adjust charging curves for battery longevity, which might appear as a change in performance.
    • Action: Ensure your vehicle's software is up to date. A full charge cycle (charging to 100% and driving down to a low percentage, then recharging) can sometimes help the BMS recalibrate.

  3. External Factors Affecting Range:

    • Cause: Cold weather significantly impacts EV range. Aggressive driving, heavy use of climate control, and larger/less aerodynamic wheels can also reduce efficiency.
    • Action: Consider your driving habits and environmental conditions. Check tire pressure regularly, as underinflated tires can reduce range.

  4. Potential Battery Issue (Less Common):

    • Cause: While rare, individual battery modules can degrade faster or develop issues, leading to more pronounced range loss or charging limitations. Internal diagnostic codes (not standard OBD-II) would be present.
    • Action: If the degradation seems excessive (e.g., >20% in a few years) or if you experience sudden, drastic drops in range or charging power, it's time to schedule a service appointment with Tesla. They have proprietary diagnostic tools to assess the health of individual battery modules and the overall pack. They can check for specific internal fault codes related to battery performance or thermal management.

When to See a Shop: If your range loss is significantly more than expected for the age of the vehicle, or if you notice any warning lights, unusual noises, or error messages related to the battery or charging system, contact Tesla service immediately. While there are no standard OBD-II codes for specific Tesla battery module failures, Tesla's internal diagnostics are very comprehensive.

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