Charge Rate Reduced - Known issue

[Ruffles]

I've been getting Charge Rate Reduce errors at home. I have the black Elon signature wall connector. At first, the errors would come and go and unplugging / re-plugging would fix them. I had service out for a separate issue and couldn't reproduce it (go figure) so they suggested I capture the exact time when it happens again and schedule another service visit. I did and Tesla responded with this:

I found that what you are experiencing currently is due to a known issue that is under investigation. The vehicle will show this fault when it senses distorted grid voltage from the outlet, it should charge fine at another location with better grip power and using DC charging like the supercharger or CHAdeMO. This will likely be fixed in future firmware that will be sent to your vehicle automatically when available.

I just wanted to pass this on in case anyone else experiences it.

 

[phealey]

I've been getting Charge Rate Reduce errors at home. I have the black Elon signature wall connector. At first, the errors would come and go and unplugging / re-plugging would fix them. I had service out for a separate issue and couldn't reproduce it (go figure) so they suggested I capture the exact time when it happens again and schedule another service visit. I did and Tesla responded with this:

I found that what you are experiencing currently is due to a known issue that is under investigation. The vehicle will show this fault when it senses distorted grid voltage from the outlet, it should charge fine at another location with better grip power and using DC charging like the supercharger or CHAdeMO. This will likely be fixed in future firmware that will be sent to your vehicle automatically when available.

I just wanted to pass this on in case anyone else experiences it.

thank you for this post.
Finally someone else with exactly same problem. A mobile tech looked at my vehicle LR AWD Model Y and confirmed the known issue story that will be fixed by firmware update. I certainly hope they issue this soon.

 

[Ruffles]

Looks like this is fixed in 2020.40.3. I had my Y plugged in running 2020.36.12 and it was charging at 16/40 amps. After applying the update, its now charging at the full 40 amps again.

 

[Nhawk]

Just had the alert on my P3D+. Charged at 48A for maybe 15-20min, then went to 0A, and then climbed up to 32A and produced the error.
Now I'm wondering if it's a hardware issue with 1 of 3 AC/DC converters that some had swapped earlier or if it's a software issue. I'm on 36.16 firmware. (I already reset & power-off the car and reset & re-plugged the HPWC)

 

[Nhawk]

Charged at Tesla HPWC and got the same error, so I know it's not my HPWC.

 

[Nhawk]

40.4 didn't help

 

[Batfish]

40.4 didn't help

Crap. That’s not what I was hoping to see.

 

[JD-TX-44]

My 2017 X is now having this issue on 40.4

 

[NY_Rob]

The EVSE only passes power from your house to the vehicle via standard open/close 100yr old tech mechanical relays. It does no "conditioning" or AC to DC conversion, so it's a vehicle problem most likely.

 

[Nhawk]

@NY_Rob
It happened at my house (every time this month) and at Tesla service center.
Voltage changed at most +-1Volt.
So this is most definitely a vehicle problem. The only question is whether it's software or hardware issue.
i.e. they could have lowered temp limits or something else, and it may be triggering the issue after a few minutes of charging.

 

[Nhawk]

My 2017 X is now having this issue on 40.4

So what have you done so far?

 

[phealey]

Looks like this is fixed in 2020.40.3. I had my Y plugged in running 2020.36.12 and it was charging at 16/40 amps. After applying the update, its now charging at the full 40 amps again.

I also found that the 2020.40.3 update fixed my mobile connector reduced charging rate back to 32 Amps. Having hpwc installed this week. Hopefully no issues. Nervous about future software updates?

 

[Ruffles]

No. I'm not nervous. I look forward to them. I've had FAR more good experiences than bad ones.

 

[Batfish]

I spoke to a service center dude yesterday via text about this issue and this is what he told me

 

[Sealander]

Same problem with my 2018 Model 3 LR. I thought the problem was on a public Tesla wall charger, but then tried it at home at 48A and it exhibited the exact same symptoms. Takes a few minutes with the current going up and back down to zero before it finally gives the charge rate reduced notification. Will only charge with a max of 32 amps now on a 48 amp wall charger. Currently on 2020.40.8

 

[Batfish]

Just installed 2020.44 and it didn’t fix it for my vehicle. Getting really frustrated here

 

[Nhawk]

I'm going in for service and they already ordered parts for PCS. Thus, it seems that these are hardware and not software issues. Maybe Tesla wants to keep people from coming in and thus they're claiming it's software. It also seems like many of the people with the issue had their cars made in 2018. (Bad batch?)

 

[maknum]

Created an account so I Could post some info for you guys.

Had the same issue with my LR Model Y. I actually was charging fine for the first 2 weeks, then it was capped at 32 amps instead of 40 amps, (I only have it hooked up to a 50 amp breaker).

Took it in for service. They replaced the power conversion system. Happy to say it works as it should now.

Sorry for those holding out for a software fix....it's probably hardware.

Also of note, I did NOT have to update the firmware for my HPWC at all....

 

[Nhawk]

@maknum can you show what parts were replaced on the work order?

 

[maknum]

@maknum can you show what parts were replaced on the work order?

Hope that helps.

He told me he replaced the whole power conversion system. Also that there was a screw loose back there too? Lol...