Low Voltage Electrical System & Rear Axel Steering Disabled

[Vesder21]

So I'm guessing you got this? How many times? Do you still drive it?
I got it last week and within a week it happened 2 more times. The last time it went on limp mode and I freaked out because I was holding traffic.
I have a feeling this has to do with an issue using the low battery voltage vs the high battery.
I was charging my phone, the first instance.
second time I had left the car with the AC blasting while I did some shopping, and as soon as I got in the car started to freak out.

this only occurred once and I have been fine ever since.

Sponsored

 

[n30nv]

Have you guys found the root cause for this one? I have ran into this 4 times in past 2 days. I have my suspicions but before I go down that path I want to check if in US at least you guys were able to identify what might be causing this.

 

[Crissa]

Have you guys found the root cause for this one? I have ran into this 4 times in past 2 days. I have my suspicions but before I go down that path I want to check if in US at least you guys were able to identify what might be causing this.

There are several threads but the causes have been different. DC-DC board, main wiring loom, and distributed controller boards have all been suspects.

These errors crop up when sensors go out of bounds which can be caused by insufficient or too much base voltage to the sensor - but several of the end components could be causing the voltage sag with a short, too. It locks out different electronic systems to reduce probability of damage, but those systems are not usually the cause of the error... they're just dependent upon each other.

The only way to really know is to get into the service mode and trace down the pattern of errors against other error patterns, which we don't have enough data here on the forum to do.

Please make sure Tesla fixes it for you! It's almost definitely a warranty issue.

-Crissa

 

[n30nv]

There are several threads but the causes have been different. DC-DC board, main wiring loom, and distributed controller boards have all been suspects.

These errors crop up when sensors go out of bounds which can be caused by insufficient or too much base voltage to the sensor - but several of the end components could be causing the voltage sag with a short, too. It locks out different electronic systems to reduce probability of damage, but those systems are not usually the cause of the error... they're just dependent upon each other.

The only way to really know is to get into the service mode and trace down the pattern of errors against other error patterns, which we don't have enough data here on the forum to do.

Please make sure Tesla fixes it for you! It's almost definitely a warranty issue.

-Crissa

Thanks for the quick response. So for me this started after they swapped the wiper assembly to an interim one. (interim because it's still not resolved yet) Anyway, then we got hit with like 30cm+ snow and then I had this issue cropped up 4 times in 2 days back to back.

Fast forward to today, just came back from a week long Pennsylvania and New York (city) trip. (I took the truck because of the storm and because Tesla doesn't allow crossing the border with a loaner) The issue hasn't came up so far.

I did two things before I left. Powered OFF the truck properly (wait n all) and started back up. Opened up the maintenance panel under the frunk and made sure it's dry over there. (This is where i found water dripping near LV maintenance area where wiper assembly is attached to the windshield).

My hunch is the water dripping in that area is causing a short in LV because this only started after they swapped the wiper assembly + snow + me finding water dripping inside (i could clearly see only that area was wet and holding water with the discoloration). Plus the fact that for me this issue occurred and then went away after I got out the truck and got back in (meaning the issue didn't stayed for a while that I needed a tow)..

Sorry for the long message. Just sharing my experience so far. FYI. The service guy said water dripping underneath the wiper assembly is "normal". I doubt it. Because clearly there are multiple level of seals included near maintenance panel area.

Hope it make sense

 

[Crissa]

Yeah, those kinds of temperatures - slipping in and out of freezing while getting precipitation can cause even just condensation in connectors.

If you can stay on the dry side, that should help reduce symptoms, if that's the cause.

-Crissa

 

[n30nv]

Yeah, those kinds of temperatures - slipping in and out of freezing while getting precipitation can cause even just condensation in connectors.

If you can stay on the dry side, that should help reduce symptoms, if that's the cause.

-Crissa

Yeah I'm gonna keep an eye. A friend (another CT owner) told me to still take it to service and get a loaner. But I now want to see the issue pop up again (with snow and all) So I can show them the correlation before i just take it back to them. I dont trust them to find the root cause after a week of not having it popped up again. Fingers crossed in the meantime.

 

[Deleted member 22486]

What pieces of shit we’ve all purchased or leased. Amazing engineering goals ruined by poor engineering execution and quality control.

We all wish the trucks were better but the reality is they are not ready to be sold to the public.

 

[n30nv]

What pieces of shit we’ve all purchased or leased. Amazing engineering goals ruined by poor engineering execution and quality control.

We all wish the trucks were better but the reality is they are not ready to be sold to the public.

So i have a Model 3 2022 as well. And have experience with a Model Y (in the family) what i would say is this is normal for Tesla or any other vehicle that is built on a brand new paradigm. Early Model S had many issues which were refined in later years and Model X got benefitted by that similarly. Early Model 3 or Model 3 in general had many issues up until 2021 22 i believe. Which were then refined with Model Y. (Hence why Toyota called it a work of art) You can consider Highland and Juniper the most refined versions of Model 3 and Y respectively.

If you follow the same logic, Early adopters of CT knew what they were getting into. (If they were a previous Tesla owner or if they may have done some research on previous Tesla woes) The point is whether Tesla is fixing the issues popping up or not. I would say since I got the truck in late November, I have taken my CT more times to service than I expected. But the good thing is they are actually fixing things very very quickly. So far, minus the wiper, I have no other issue pending which haven't been resolved. Compared to other North American vehicles. But then some Japanese and European brands are shit as well.

Most of the issues I have come across shows that daily driving testing in Canadian cold weather was not done and it make sense. But if they fix them all then I'm good.

Do I regret buying CT? Absolutely Not. Will I buy another Tesla? 100%. I'm a tech nerd and for me it's an expensive piece or gadget that can also take me from one place to another ?

 

[Deleted member 22486]

Four Teslas here. Masters in Mechanical Engineering. Tech nerd as well. Yes, Teslas are not known for quality and I knew that going in, but…..Amazed as I am by the CT engineering, at some point you have to admit that they either didn’t test, properly engineer or QA test the vehicle and its subsystems.

 

[n30nv]

So it happened again today and this time they have ordered a replacement for this harness.

https://service.tesla.com/docs/Cybe...UID-A46728FB-7B3F-4E09-8D32-057D591326DB.html

Not sure how they found out because i didn't even had a chance to take the truck there. Unless they did remote diagnostics. I did send them list of alerts I received from Tessie though so they may have traced it from that.

 

[TwiztOG43]

So it happened again today and this time they have ordered a replacement for this harness.

https://service.tesla.com/docs/Cybe...UID-A46728FB-7B3F-4E09-8D32-057D591326DB.html

Not sure how they found out because i didn't even had a chance to take the truck there. Unless they did remote diagnostics. I did send them list of alerts I received from Tessie though so they may have traced it from that.

Did you have any issues since the harness was replaced? I have had the same errors happen a couple times. It seems it happens when anything is plugged into the power outlets in the bed or cabin while driving.

I get the same alerts, but also an alert to disconnect everything plugged into the outlets and reset. Then exit and reenter the vehicle. After that I can drive without any errors.

When nothing is plugged into, no alerts what so ever. It doesn’t seem to be a particular device I plugged in. I’ve tried numerous devices, starlink gen 3, mini fridge, phone charger in different outlets at different times, the alert pops up.

 

[n30nv]

This is what they replaced on mine. It actually wasn't the harness. They ordered the harness for engineering study. (Tesla orders engineering study when they find an issue which is not widespread and they want to identify what the root cause is so they can be ahead of it, if it does becomes widespread due to something).

My suggestion is dont bother diagnosing it yourself. Just take it to service. I mean I was able to see PCS alerts in the service menu. Plus what I also did is gave them the timeline of alerts via Tessie since I do have that as well.

Since they replaced PCS I haven't had this issue popped up. Although hopefully it won't again in next winter.

 

[xcellbeast]

PCS...I had similar issue last July....took them 1 week to diagnose....another week to get part and replace. Haven't had any other issues since.

 

[Vegetaban]

I got this error today while driving down to Florida from Pennsylvania, unfortunately it happened right as I was getting on the highway. I was able to pull to the side of the road safely and exit walk around the car and get back in. The notification went away upon doing that. I also got the error with the rear axle and turtle mode. Everything cleared after Reese entering the car I did a screen restart as well just to be safe, it seems to be OK right now. I called Tesla emergency hotline and they told me if it happens again. I can just pull into a service center driving down south. I had my Starlink refrigerator and a wheelchair charger in the trunk all plugged in so I unplugged a couple things. I wonder if it’s that.

 

[Vegetaban]

Here’s what service mode showed

Sponsored