Regenerative braking temporarily off.

[KeithT]

Have just (about 2 weeks ago) started getting a message on first startup of the day to the effect that "regen is temporarily not operational". This is a normal message if the battery is fully charged but not the case here. Regen actually is operational immediately (as it should be) and the message doesn't appear again even though I go to Park and restart. Seems to only display after shutdown for a time. I'm on 2020.8 but can't relate the message to a software change. Any ideas?

 

[holmgang]

Battery temperature

 

[KeithT]

@holmgang We are in Autumn but the temperature in my garage hasn't dropped below 14C yet.

 

[swaltner]

Does it say “not operational” or “temporarily reduced”?

if it says “not operational”, that’s something you should contact Tesla Service about.

if it says “temporarily reduced”, that’s because the battery is cold. Yes, 14C is considered cold for full regeneration capabilities.

 

[Radlaw]

Battery at capacity and cannot accept any more energy. Therefore regeneration cannot happen until battery energy is used by driving it. On my car, which I charge to 90%, it won't accept regen energy until it's down to about 84%.

 

[Runt8]

Battery at capacity and cannot accept any more energy. Therefore regeneration cannot happen until battery energy is used by driving it. On my car, which I charge to 90%, it won't accept regen energy until it's down to about 84%.

I’ve never had a problem getting full regen at 90% if my battery is warm.

 

[Kirby64]

I’ve never had a problem getting full regen at 90% if my battery is warm.

I get full regen issues at 90% (like 1 or 2 pips worth) if it's less than like 80F outside. Even 70F outside temp causes slight regen restriction in my experience.

 

[neptunesfinest]

Would be helpful if you posted the actual message.

 

[KeithT]

Does it say “not operational” or “temporarily reduced”?

if it says “not operational”, that’s something you should contact Tesla Service about.

if it says “temporarily reduced”, that’s because the battery is cold. Yes, 14C is considered cold for full regeneration capabilities.

Sorry everyone that I didn't post the actual message. Have had confirmation on the reason for this. If the battery temperature drops below 20C you can get a message to the effect that full regen will return after some driving. I did realize that there was a dependency with regen on temperature but imagined that it would only affect folk who experienced snow -)