DC fast charging interruption after a few minutes

[risingphoenix]

I’m on a road trip and wanted to get others opinion about the problem with my R1S. Fast DC charging will just randomly stop - sometimes after 1-2 minutes and other times after 10-15 minutes. Every time I plug in to start, DCFC will get interrupted after a short time both Tesla and EA. I can’t then use the same charger as it just shows red. So I have to switch to a different charger. Eventually after switching to 2-3 chargers I can get enough added charge to continue. Things I have tried without success:
1. Hard reset multiple times
2.. removed payment method and reentered in Rivian app.
3. I have 2 A2Z adapters and both exhibit the same problem (and it happens at EA).
4. I’ve initiated at Tesla SC both via plug in and from app subscription.

yesterday I faulted at a Tesla sc and moved to another charger. A ford lightning pulled up to the same charger and plugged right in no problem. Based upon that I know it’s a problem with my R1S but curious if others know exactly what the problem is.

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[risingphoenix]

Also it doesn’t appear to be related to charging speed. I had a session at a Tesla sc that started at 200kw then was tapering to 60kW at 80% and tripped.

 

[Electrified Outdoors]

It's hard to say for sure but based on what your saying it sounds like a problem with the R1S as you concluded. I would schedule service with Rivian. Could be a charge port issue.

 

[COdogman]

I have had this happen at EA chargers within the first few minutes of charging, but I am almost positive it was caused by the EA app getting hung up reloading my payment reserve. Then when I move to a new charger it worked fine. If it were an issue with your Rivian I think you would see it happen at each charger you try.

As far as it tapering off at 80%, that is normal for a Rivian charging curve. You can find plenty of shared charging sessions here that confirm that.

Is it giving you any error messages on your driver display? Have you called the service number while you are there charging?

 

[risingphoenix]

This is a problem at all chargers tried. I pointed out that it errored out after tapering not to point out that tapering is abnormal (it isn’t) but that it’s likely not an overheating or high charge fault since it was at about 60kW when it tripped.
The only error it gives is that I should switch to a different charger after letting it cool down. My suspicion is that there is a faulty temp sensor in my R1S that trips randomly

 

[COdogman]

This is a problem at all chargers tried. I pointed out that it errored out after tapering not to point out that tapering is abnormal (it isn’t) but that it’s likely not an overheating or high charge fault since it was at about 60kW when it tripped.
The only error it gives is that I should switch to a different charger after letting it cool down. My suspicion is that there is a faulty temp sensor in my R1S that trips randomly

Yes, I would agree after what you just said about the error message.

 

[Yossarian]

I have no personal experience with DCFC's but this article from Bloomberg has some information on fast charging that is interesting, though probably not particularly helpful:

Why Public EV Chargers Almost Never Work as Fast as Promised
Most public machines in the US average about half their maximum speed, a gap that risks hindering further adoption of electric cars.

 

[Dave Cundiff]

Guess the Bloomberg reporter didn't know about the specific problem where EA's 350-kW chargers throttle back to 41 kW when EA's poorly designed "350 kW" cables malfunction.

That would explain a lot of the unpredictability that he observed with EA.

 

[Joe Hoffman]

I had a similar issue when I thought my charge limit was 100% but in fact it got reset to 70%.
so once the charger got the vehicle to 70% it shut off. Subsequent attempts to start it again generated errors and bricked several EA chargers until they were rebooted. Spend 30 minutes on the phone with EA CS agents. And another 20 minutes with Rivian CS agent. All very nice but the error we were getting didn’t lead anyone to think to recheck the charge limit set in the vehicle.
Bottom line it’s a freak bug in the EA charger software when charge limit is right at or 1% off of the current charge value.
That’s an hour I’ll never get back.

 

[MejDam]

Out of curiosity, have you tried DC Fast charging on a ChargePoint 62.5kW, EVgo 50kW, or EVgo 100kW station? I rented a Rivian R1T on Turo that would error out when charging on a station above 100kW. While I recommend taking your vehicle to the service center, gathering as much information as possible beforehand will greatly assist them in diagnosing the problem.

 

[risingphoenix]

Update:
I was able to make it home limping from charger to charger, utilizing both EA and Tesla SC plus adapter. Failure rate was about 80% - most of the time when I plugged in it automatically gave a red ring with failure. Some of the time it would initiate (regardless of initiation via app or plugin direct or credit card with EA) but then trip off within a minute. And occasionally it would charge successfully for some time but would always end up tripping off with a red ring. It seems highly likely that there is a faulty temperature sensor in the DCFC unit and I have an appointment in November to get it looked at - hopefully with a replacement of the DCFC unit. Meanwhile I can successfully charge with L2 but can not safely travel if dependent upon fast charging.

 

[risingphoenix]

Out of curiosity, have you tried DC Fast charging on a ChargePoint 62.5kW, EVgo 50kW, or EVgo 100kW station? I rented a Rivian R1T on Turo that would error out when charging on a station above 100kW. While I recommend taking your vehicle to the service center, gathering as much information as possible beforehand will greatly assist them in diagnosing the problem.

I did not try any Chargepoints or EVgo but did try the 150 EA and had no more success or failure over the 350kW EA stations. Due to the incredible unpredictability of the error fault (and the fact that I had to reboot the vehicle almost every time I wanted to charge) it seems that I need a new DCFC unit.

Edit: Not DCFC unit, but likely CGM error after looking at similar issues others have had online.

 

[risingphoenix]

Update to this adventure. Finally had SC appointment in November and they replaced a wiring harness, which appears to have fixed my DCFC issues. I've tried fast charging on 3 different networks (Rivian, Tesla, EA) without interruption or problem.

 

[WarLegal]

Update to this adventure. Finally had SC appointment in November and they replaced a wiring harness, which appears to have fixed my DCFC issues. I've tried fast charging on 3 different networks (Rivian, Tesla, EA) without interruption or problem.

What year is your R1S? I just got a 2022 R1T and am having what sounds like the same issue. Would you mind sending me some information about the exact fix (maybe the Rivian SC write-up) so I can share it with my service center? I am having a similar issue with charging on DC and no issues charging at home.

 

[risingphoenix]

What year is your R1S? I just got a 2022 R1T and am having what sounds like the same issue. Would you mind sending me some information about the exact fix (maybe the Rivian SC write-up) so I can share it with my service center? I am having a similar issue with charging on DC and no issues charging at home.

"Loose pin fit on wire from charge port harness to CGM"

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