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Regenerative braking disabled in very cold conditions

Discussion in 'Model S: Driving Dynamics' started by tennisman, Jan 16, 2015.

  1. tennisman

    tennisman Member

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    Has anybody experienced the following message upon starting up their car - "regenerative braking malfunction a proceed with caution"? I could tell when I let off the accelerator, I could feel car did not slow down as usual. Should I contact service center?
     
  2. santana338

    santana338 Member

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    Definitely contact the service center. They likely know about it already. They will let you know how they plan to address the problem.
     
  3. pgiralt

    pgiralt Active Member

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    Did it actually have the word "malfunction" or did it say "disabled"? I think there are some legitimate conditions that disable regen (very cold weather) but the message wouldn't use the word "malfunction" if it was intentional.
     
  4. Aussie Bob

    Aussie Bob Member

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    We have that problem in cold weather until cars heated up. Was temperature a problem?
     
  5. tennisman

    tennisman Member

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    You're right - I think it actually did say disabled. My car is always in the garage, but for a couple of days it was outside - the temp at night was down to about 10 degrees F - could this have caused it? And will it reset itself or does it have to go to service center to do this?
     
  6. EdA

    EdA Model S P-2540

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    When the battery heats up enough regen will start coming back.
    You can get around this issue by keeping your car plugged in and before you leave preheat the car
    raise the charging limit a bit. 15 minutes of this should get you a decent amount of regen.
     
  7. tennisman

    tennisman Member

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    Thanks to all for your help - great to know that Tesla owners are so helpful!!
     
  8. NigelM

    NigelM Recovering Member

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    Mod note: thread title amended for clarity. There was no malfunction, this is normal operation.
     
  9. EdA

    EdA Model S P-2540

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  10. santana338

    santana338 Member

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    Ooops. Should have questioned the wording first. Glad it all worked out.
     
  11. islandbayy

    islandbayy Active Member

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    I didn't see it mentioned, so I will say it now.

    The reason the Regen gets disabled, is due to the battery temp. A Lithium Ion cell, such as what is in the Model S, cannot be charged when the cell temp is at or below 32*F (Or in other words, freezing).
    The reason for this is when charged below freezing, the internals of the battery Electroplate themselves. The end result, is PERMANENT IRREVERSIBLE Capacity loss. Once the pack heater and/or driving the vehicle bring the cells internal temp above 32*F, charging will resume. The amount of regen will increase as the cells reach the ideal temps.
     
  12. RichardC

    RichardC Cdn Sig & Solar Supporter

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    Now going through my third Canadian winter with the Model S. In order to avoid (or substantially reduce) this problem, I set the car to charge for five or six hours immediately prior to driving, and also turn on the interior heating for 10 minutes before leaving, all of which results in greater comfort, better regen function and reduced battery power consumption.
     
  13. Rheazombi

    Rheazombi Member

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    I get this problem daily, as I always have to park outside (19 degree weather here at the moment). Usually takes half an hour of driving to get my regen back. You're not alone, OP!
     
  14. bint2k

    bint2k Member

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    Hey RichardC, what other issues have u come across if not charged before driving in the winter? IE. length of time for the cabin to heat up if left out in the cold?
     
  15. dsm363

    dsm363 Roadster + Sig Model S

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    It was mentioned above but tying to time charging to finish right before you leave and turning on your heat remotely with the app 30 min before you leave helps.
     
  16. rapoport3a

    rapoport3a Member

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    Those things do help, but if you have time of use pricing on electricity, you may be spending more $$ than you planned. Where I am, at 7 AM in the winter the price goes up about 50%. I'll warm up the battery after that but I try like anything not to charge it then. I do a few calculations to try to stop the charging just before 7 if I'm leaving by about 8.

    If I leave later than that, I may as well charge the battery the night before. The morning charging isn't foolproof, either. Last week I set the timer to start charging at 5:15 AM but the car refused to start charging. First time that's ever happened; no explanation. If I had charged the battery while I was awake, I would have seen the problem and done something about it. (The solution was to reboot the touch screen.)
     
  17. Rheazombi

    Rheazombi Member

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    Haha aww, if only I had home charging ;) I could certainly start the heater through the app though (we've been doing that anyway, but we usually only know we're going to drive somewhere about 5 min before)
     
  18. invisik

    invisik Member

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    Please note, when regen is disabled or limited, the car will not slow down as much as it normally would when you lift off the accelerator. This always surprises me a little at the first few stops. You will have to press the brake to slow.

    Stay warm!!

    -m
     
  19. tliving

    tliving Member

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    Daily occurrence to see it disabled here in New England. Mostly driving around these days with it disabled or very limited and thats with a lot of driving. Below about 30F you'll see it a lot.
     

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