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Significant Range Loss on My 2017 Model S 75D - Is This Normal?

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Diana O. · rep 0 · May 22, 5:28 AM · 1 replies · solved · Question

Vehicle: 2017 Tesla Model S 75D

Hey everyone, I've got a 2017 Tesla Model S 75D with about 90,000 miles on it. Lately, I've noticed a pretty significant drop in my maximum range. When fully charged, it used to show around 230-240 miles, but now I'm lucky to see 200 miles, sometimes even less.

I try to follow good charging practices, mostly charging to 80-90% and rarely letting it drop below 20%. Is this level of degradation typical for a Model S of this age and mileage? I'm wondering if there's something specific I should be looking into or if it's just expected battery aging. Any advice would be great!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:28 AM

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ClearTheCode admin answer: It's common for EV batteries to experience some degradation over time and mileage, but a sudden or significant drop warrants investigation.

Here's what to consider:

  1. Normal Degradation: A 10-15% range loss over 90,000 miles and 6-7 years is within the expected range for many EVs, including Teslas. However, if the drop feels sudden or more severe, it could indicate an underlying issue.
  2. Recalibration: Sometimes, the battery management system (BMS) can lose calibration, leading to inaccurate range estimates. Try fully charging the vehicle to 100% and driving it down to a very low state (e.g., 5-10%) a couple of times. This can help the BMS recalibrate and provide a more accurate reading.
  3. Charging Habits: While you mentioned good habits, consistently fast charging (Supercharging) can accelerate degradation compared to slower AC charging. Extreme temperatures also play a role.
  4. Diagnostic Check: Tesla service centers can perform a detailed battery health diagnostic. They can check for specific cell imbalances or other issues that might not be apparent from the dashboard. While there isn't a standard OBD-II code for battery degradation, Tesla's internal diagnostics can reveal issues like BMS_a001 (cell imbalance) or BMS_w023 (reduced capacity).
  5. When to See a Shop: If the range loss continues to worsen rapidly, if you experience sudden power limitations, or if charging becomes inconsistent, it's crucial to schedule a service appointment with Tesla. They can assess the battery pack's health and determine if any components need attention or if it falls under any warranty provisions.
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