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Front wiring harness water ingress failure

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#61 · (Edited)
Dixyburger said:
@Von_Nasty, look at this thread, could be a cause for your persistent parking assist error and no front sensors maybe?
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Yes it does sound similar... going to try a 12V reset first and maybe wait till the next OTA. If it still doesn't clear after that I think you might be right...

No visible damage in my smart zone, but I see some other people also didn't see damage. So it doesn't mean no water got in.
 
#62 ·
Thought I would add my post link here, there is water ingress, and the technician says is a known problem. Mine is a 2025 model no visible water damage, but its got in as all the errors real and ghost exist, he tells me the wheel arch hasnt been sealed so the rain when driving gets into the sensor relay. I too have a P4 from LCH coming today, £1000 excess, so hopefully i dont crash it !

My post
 
#64 ·
jim5667 said:
Thought I would add my post link here, there is water ingress, and the technician says is a known problem. Mine is a 2025 model no visible water damage, but its got in as all the errors real and ghost exist, he tells me the wheel arch hasnt been sealed so the rain when driving gets into the sensor relay. I too have a P4 from LCH coming today, £1000 excess, so hopefully i dont crash it !

My post
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I'm at the dealer getting my car updated and they're checking for a leak. I've been told they haven't seen any leaks yet on Polestar 3's. We've seen this issue pop up on Launch Edition and South Carolina built cars so it can't be an issue with the microphone that's located in the wheel wells of SC made cars.
 
#66 ·
ABK said:
Am anyone that have gotten this issue fixed? My car has been in for 7 weeks no and no guide on timeline etc
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Nope. 4 weeks waiting for parts here now, no word on when they will arrive.
I drive the car daily and new faults keep appearing, now the BLIS system is malfunctioning.

Technician had no info about this problem from Polestar and the plan is only to change the corroded parts. 🤷🏻‍♂️
 
#68 ·
Sorry everyone is going through this. I haven’t experienced any issues but with an early Chengdu VIN I’m not holding my breath. Ironically I switched to a P*3 after my new EV9 was a lemon so the thought of potentially having to do it all again sucks (but I’m aware of the early adopter risks - it’s worth it to enjoy the car during the good times imo). Keep us posted plz.
 
#69 ·
They know water ingress is an issue. I think the problem will depend on how much water or moisture has entered the wiring and relays. I guess worst case is wiring and relays need replacing. They have told me mine will be a week so again guess its not been bad water ingress. So no new parts needed.
 
#70 ·
I can report that I have this issue also and verified by Polestar service. Now replacement parts ordered and apparently it seems that the entire thing needs to be replaced.

In my case the heater wires were on 24/7 and I could burn my fingers when touching the heated zone.
 
#71 ·
jim5667 said:
They know water ingress is an issue. I think the problem will depend on how much water or moisture has entered the wiring and relays. I guess worst case is wiring and relays need replacing. They have told me mine will be a week so again guess its not been bad water ingress. So no new parts needed.
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Yeah. They checked my car for water ingress when I took my car in for the 1.2.15 update. Not sure if they implemented a fix but they 100% know about it.
 
#72 ·
Northern Star said:
I can report that I have this issue also and verified by Polestar service. Now replacement parts ordered and apparently it seems that the entire thing needs to be replaced.

In my case the heater wires were on 24/7 and I could burn my fingers when touching the heated zone.
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Interesting. I wonder if that's also related to my rear window defroster being on 24/7.....and seriously hot. That issue seems to have been resolved with v1.2.15.
 
#73 ·
I just got word that my car (delivered 3/10, in shop since 3/26) has water ingress. What has me worried (other than just leasing a car and not having a car and now paying for taxis/rails when I had a working car before) is that this could be a universal defect. My car was parked outside (last 5 = 27080, SC built) and stopped working after a round of heavy rains. It may be all the cars have this flaw but being garage kept is allowing it to not show
 
#74 ·
rp3 said:
I just got word that my car (delivered 3/10, in shop since 3/26) has water ingress. What has me worried (other than just leasing a car and not having a car and now paying for taxis/rails when I had a working car before) is that this could be a universal defect. My car was parked outside (last 5 = 27080, SC built) and stopped working after a round of heavy rains. It may be all the cars have this flaw but being garage kept is allowing it to not show
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They need to pay for a loaner / rental. Someone else has been without their car for over a month and it’s unacceptable!
 
#76 ·
Outside of having to replace equipment once the front wiring harness is actually damaged, have service centers actually said anything about a fix to prevent water ingress from happening? I.e. sealing that opening in the wheel well/arch?
 
#77 ·
A wide swath of the US, including my area, experienced torrential rain last night. I’ve been closely following this thread since my car is also an LE, but I haven’t encountered the issues some of you have reported. However, since my commute involved driving through partially flash-flooded highways, I was particularly paranoid that if water were to get into the wrong part of the car, today would be the day.

To help me understand any patterns, I’ve compiled the VINs of those who’ve shared them (thank you for that), to see if there’s any discernible trend among the affected vehicles. Below are the vehicles whose owners have provided full VINs and confirmed their cars are affected:

YSMYKEAE3RB001525
YSMYKEAE3RB001640
YSMYKEEE7RB001098
YSMYKEEE3SB020592

There were additional posts but since full VINs were not shared, I can only work with the information given.

And for the sake of transparency, here is mine (which, again, does not have a front wiring harness issue yet):
YSREA3YB7SB002313

Now, here is ChatGPT's breakdown of the VINs (which I found infinitely better than any online site):
Image


the leftmost VIN (YSMYK...) is one of the affected vehicles, and the rightmost VIN (YSREA...) is mine.

So far, the only consistent pattern among the affected cars appears to be the first five digits of the VIN: YSMYK.

Earlier in this thread, it was suggested that the 10th digit (R vs. S), which denotes the model year, might explain the issue. However, I don’t believe this is the case, as the last affected car I listed has an “S” (2025 model).​
​
There was also speculation about the factory location (11th digit), but my vehicle was also built in ‘B’ and hasn’t experienced the same issue. I recall one post mentioning an affected car built in South Carolina, but they didn’t provide full details, so I can’t confirm that.​
​
The issue is more likely related to digits 3-5 (and possibly 6), which, according to ChatGPT, are internal Polestar revision or designation codes. All affected vehicles share YSMYK (and “E” in the 6th position).​
These digits likely correspond to internal designations tied to revisions, trim levels, or other factors not publicly disclosed.​
​
It would be helpful if affected users could share whether they have similar characteristics, such as the same trim or the Polestar symbol on the panoramic roof, as some have mentioned.
 
#79 ·
#80 · (Edited)
moonsteel said:
I thought P3's should be YSR or 7SY, then EA (non-PP) or EE (PP), then 3YB
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That wiki is somewhat off since as you can see it states position 4 and 5 should be something like EA or EE for AWD or AWD performance. And that works for my car. But those digits are for positions 6 and 7 as my table above for the affected cars. As if their VIN predates the convention listed on the wiki? As if the YSMYK vehicles are the absolute earliest batch.
 
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