2nd PCS2 failure

[PungoteagueDave]

Isn’t this likely due to your first issue being a very early failure before the updated parts or PCS failures even trending (1.5-2 years ago)? So this shouldn’t be interpreted as a continuing risk for those who have replaced their PCS in recent months, which seems to be the majority of cases?

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[gooshjkc]

I just had my replaced. So far so good. However, reading this post is giving anxiety that it might happen again. Ugh!!! Tesla really need to address this and not just put a band-aid on it.

 

[Vagis9780]

Welp, just got my 2nd PCS2 failure. At least this time I still have 24amp AC charging unlike last time where it shut the whole truck down. :/ SC says backlog is still really long.

Edit: 30k miles and almost 2 years of ownership. First failure was on day 3 of ownership at 500 miles.

My guess the PSC is the on board inverter required to take your home 120v AC electric and invert to DC voltage to required to charge battery,(unlike Supercharger which charges DC to DC). I also assume CT PSC is also used to power 48v systems and why we are NOT seeing PSC failures on other Tesla vehicles.

 

[SCTesla]

Isn’t this likely due to your first issue being a very early failure before the updated parts or PCS failures even trending (1.5-2 years ago)? So this shouldn’t be interpreted as a continuing risk for those who have replaced their PCS in recent months, which seems to be the majority of cases?

I was told they are working on a new revision and that's what I am waiting for.

 

[gooshjkc]

I was told they are working on a new revision and that's what I am waiting for.

That’s all good and dandy. However, are they going to recall every CT and replace them for free or we going to have to cough up the dough to do it. Especially for the ones that the warranty is over.

 

[SCTesla]

That’s all good and dandy. However, are they going to recall every CT and replace them for free or we going to have to cough up the dough to do it. Especially for the ones that the warranty is over.

There isn't a recall currently. It's hard to say.

They've automated a lot of the process now as they are so common. It automatically gives you free Supercharging once the self check fails.

 

[Ranger George]

Just have Grok design a new PCS for the Cybertruck.

 

[JackCypher]

I have experience in high power / energy systems, electronics. The components for the PCS are quite well rated and understood by the supplier - so failures are rarely from component lot variation. It is clear to me the circuit design is not sufficient.

AC has an additional challenge in that the current flows in both directions. This can cause tremendous stress on components unless the circuit is design to protect against that. Your washer and dyer for example use special AC 'Zero crossing' relays - which only switch when the AC current swings to zero. If you used a normal relay - it would burn out in only a few 100 cycles.

Also the PCS is apparently design to handle both DC and AC high power - which you would normally avoid as they complexity of AC or DC presents their own unique design challenges at PCS power levels.

 

[CyberGus]

Mine went out last night. 16k miles

 

[devdrone6]

That’s all good and dandy. However, are they going to recall every CT and replace them for free or we going to have to cough up the dough to do it. Especially for the ones that the warranty is over.

The answer is No and Yes. Several cases here where tesla did compensate out of warranty trucks, not the full amount but a good chunk of it. Not ideal, but better than nothing.

I have the G version so hope that lasts

 

[Ranger George]

I have experience in high power / energy systems, electronics. The components for the PCS are quite well rated and understood by the supplier - so failures are rarely from component lot variation. It is clear to me the circuit design is not sufficient.

AC has an additional challenge in that the current flows in both directions. This can cause tremendous stress on components unless the circuit is design to protect against that. Your washer and dyer for example use special AC 'Zero crossing' relays - which only switch when the AC current swings to zero. If you used a normal relay - it would burn out in only a few 100 cycles.

Also the PCS is apparently design to handle both DC and AC high power - which you would normally avoid as they complexity of AC or DC presents their own unique design challenges at PCS power levels.

Thank you for this great detailed explanation. What does this mean in the end for the PCS units in all of the Cybertrucks? Has Tesla solved and fixed the problem with the G variation of the PCS?

 

[JackCypher]

Thank you for this great detailed explanation. What does this mean in the end for the PCS units in all of the Cybertrucks? Has Tesla solved and fixed the problem with the G variation of the PCS?

I am sure these numerous failures have indicated the failure mode quite well. The solution - as always is a balance of cost vs time to implement. And in reality cars are not intended to work 'forever' so designing for 0 failure is not reality - and I would not expect that.

It could also be the home charger themselves - which may not regulate the AC signal well at 48 amps- causing the PCS to take the brunt of noise/spikes. As these are already in a vast installed base - they may limited in what solution they can take.

 

[Bill Carlson]

Welp, just got my 2nd PCS2 failure. At least this time I still have 24amp AC charging unlike last time where it shut the whole truck down. :/ SC says backlog is still really long.

Edit: 30k miles and almost 2 years of ownership. First failure was on day 3 of ownership at 500 miles.

This is going to sound stupid but what is your normal charging regimen - charge every day? Every other day? Usage of supercharging? Long trips frequently? Anything unusual about your grid/power ?

My example:
- I have 48A 240V at home which I avoid using unless necessary. Once or twice a week to 50% only unless zapping up for a trip.
- I use 30A 240V at work for 2-4 hours daily which covers commuter distance.
- I rarely supercharge unless on longer trip.
- not had a power blip or outage at home in the last 16 months.
- I usually run at 50% or below unless long trip needed which is <twice a year.

 

[JCERRN]

Different browser worked for me..

Same. I presume you are using mobile?

 

[JCERRN]

I am sure these numerous failures have indicated the failure mode quite well. The solution - as always is a balance of cost vs time to implement. And in reality cars are not intended to work 'forever' so designing for 0 failure is not reality - and I would not expect that.

It could also be the home charger themselves - which may not regulate the AC signal well at 48 amps- causing the PCS to take the brunt of noise/spikes. As these are already in a vast installed base - they may limited in what solution they can take.

If it was the case that the wall chargers were the source, then different models would experience similar stress and therefore would be more prone to fail.

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