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2017 Model S 75D Charging Slower & Noticeable Range Drop - Battery Issue?

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Mark S. · rep 0 · May 22, 5:29 AM · 1 replies · solved · Question

Vehicle: 2017 Tesla Model S 75D

Hey everyone,

I've been noticing some concerning changes with my 2017 Tesla Model S 75D lately. Over the past few weeks, the charging speed, especially at Superchargers, seems to have significantly decreased. It used to charge much faster, and now it feels like it's taking an eternity to get a decent amount of range back.

On top of that, my maximum range has dropped quite a bit. I used to consistently get around 230-240 miles on a full charge, but now it's struggling to hit 200 miles, even with careful driving. I'm aware of battery degradation over time, but this feels more sudden and pronounced than typical wear and tear.

Has anyone else with a 2017 Model S 75D experienced similar issues? Is this a common sign of a failing battery pack, or could it be something else like a charging port problem or a software glitch? I've tried rebooting the car and checking my charging settings, but nothing seems to help. Any advice on what I should check before contacting Tesla service 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 symptoms consistent with either accelerated battery degradation or a potential issue with your vehicle's charging system. While some battery degradation is normal over time, a sudden and significant drop in charging speed and range warrants investigation.

Here are steps and considerations:

  1. Check Charging Settings and App:

    • Ensure your charging limit in the car and Tesla app is set appropriately (e.g., 80-90% for daily driving, 100% only when needed for long trips). Charging to 100% frequently can accelerate degradation.
    • Verify that 'Scheduled Departure' or 'Scheduled Charging' settings aren't inadvertently limiting your charging speed or duration.
    • Check the Tesla app for any service alerts or notifications related to your battery or charging system.

  2. Understand Battery Degradation:

    • Tesla batteries are designed to last, but capacity naturally decreases over time and mileage. Factors like frequent Supercharging, extreme temperatures, and consistent charging to 100% can influence this rate.
    • A 2017 Model S would typically show some degradation, but a sudden drop below 80% of original capacity might indicate an issue beyond normal wear.

  3. Potential Causes:

    • Battery Cell Imbalance/Failure: Individual cells or modules within the battery pack can degrade unevenly or fail, leading to reduced overall capacity and charging efficiency.
    • Battery Management System (BMS) Glitch: The BMS might be miscalculating the available capacity or limiting charging due to an internal error.
    • Charging Port/Cable Issue: Less likely if it's affecting both Supercharging and home charging, but a faulty charging port or even a degraded Supercharger cable (though rare) could contribute.
    • Software Limitation: Tesla occasionally implements software updates that can slightly alter charging curves or battery management for longevity, but a drastic change is usually indicative of a hardware issue.

  4. When to See a Shop (Tesla Service):

    • Immediate Action: Given the significant and sudden nature of the problem, it's highly recommended to schedule a service appointment with Tesla. They have proprietary diagnostic tools that can accurately assess the health of your battery pack and charging system.
    • Remote Diagnostics: Tesla can often perform initial diagnostics remotely by accessing your vehicle's logs. Be prepared to provide details of the range drop and charging speed reduction.
    • Warranty Check: Your 2017 Model S 75D likely came with an 8-year, 120,000-mile battery and drive unit warranty. Depending on your mileage, your battery issue might still be covered, especially if it's deemed a manufacturing defect or premature failure.
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