2nd PCS2 failure

[cyberHowie]

I've had the issue at another L2 charger. I also have a model 3 with no issue and charge other tesla's with no issue. I also have 2 chargers and the Cybertruck is the only one that has any issue on either of the chargers...

just curious, do you have solar at the house that has trouble charging?

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[cadamo001]

just curious, do you have solar at the house that has trouble charging?

I do have solar. But just this past weekend the Cybertruck did the same thing (stopped charging) on a chargepoint device at a hospital.

 

[cyberHowie]

I do have solar. But just this past weekend the Cybertruck did the same thing (stopped charging) on a chargepoint device at a hospital.

interesting... that's a good data point. My PCS failed twice and I have solar at my house. Then my solar inverter failed, so I just have this theory they're related.

 

[cadamo001]

interesting... that's a good data point. My PCS failed twice and I have solar at my house. Then my solar inverter failed, so I just have this theory they're related.

They might be. I can replicate the issue at night though when there is no solar. Not saying that the solar inverters (Tesla) didn't cause the damage originally and now this is just the PCS acting in a failed state.

The "stopped charging" issue is consistent at my house but not everywhere else. Seems to be intermittent at other charging locations. Which is worrisome..

 

[L3it3R]

This is one of the top reasons I’m trading mine in - have been waiting for over 2 months now and my service center appointment isn’t even until after I’m set to swap it for a new MYP

 

[vandytom]

Tesla msged me saying they ran diagnostics and don’t see the PCS alert. I checked the dash and alerts are gone. I saw 2 back to back June 5-6. It was just in the alert center. Now it’s gone. wtf. Does this mean it’s foreshadowing failure?

 

[drewm]

As an electrical engineer this was the failure reason I was expecting all along. It's likely the Mosfets are failing at usage below their rating, this is likely correct.

Exactly the same issue we're seeing with the 800v Hyundai/Kia ICCU https://insideevs.com/features/752768/hyundai-kia-genesis-iccu-failure/

And the Porsche 800v sudden power loss issue https://www.roadandtrack.com/news/a36518296/porsche-taycan-power-loss-recall/

What MOSFETs Are and Their Role in the PCS

A MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) is essentially a high-speed electronic switch. In power electronics, they’re the workhorses — they switch on and off thousands of times per second to control and convert electrical energy. Think of them like relay switches but operating at frequencies no mechanical part could ever match.

The CT’s PCS2 functions as both the onboard charger (OBC) and DC-DC converter in a single unit. Its core job is to take the ~800V from the main pack and step it down to a stable 48V to run all the truck’s accessories, control modules, lighting, steer-by-wire, etc. It also handles bidirectional power — so V2L, V2H, and external outlet functionality all run through it. 

The MOSFETs inside are the actual switching elements doing that voltage conversion. Every charging session, they’re toggling millions of times, generating heat with each cycle. The thermal stress from that repeated expansion and contraction is where the problem lives.

At 48A, the MOSFETs are pushed to temperatures where their physical structure can begin to micro-fracture or “delaminate” over hundreds of heat cycles. At 24A, the thermal expansion/contraction of the internal boards is significantly reduced. 

The widespread PCS failures in 2024 and 2025 Cybertrucks are attributed to thermal fatigue in the MOSFETs — and this was not a PCS-isolated problem. The drive inverter recall (NHTSA 24V-832) used similar faulty MOSFET components from the same production era.  So the root issue is that the MOSFET spec chosen for the original PCS wasn’t robust enough for the sustained thermal cycling demands of the CT’s 48V architecture under real-world charging loads.

The PCS is also not as vertically integrated as some Tesla components, so sourcing, qualifying, and scaling production of revised boards involves suppliers, reliability testing, and certification — it’s not a quick ramp like simpler parts.

 

[Outdoors]

This is one of the top reasons I’m trading mine in - have been waiting for over 2 months now and my service center appointment isn’t even until after I’m set to swap it for a new MYP

Same here for mine. SAWD or a R2 Rivian. Whomever gets me the order first.

Price offered was insanely high.

 

[GollyGee]

@Edphonse
Your discussion has been summarized by this article:
https://www.torquenews.com/17998/cy...0-miles-now-he-s-dealing-second-failure-30000
Is this fair use?

 

[zach]

Same here for mine. SAWD or a R2 Rivian. Whomever gets me the order first.

Price offered was insanely high.

I have really enjoyed my Cybertruck--the best vehicle I've ever had. Considering that and that it's paid off, I wanted to keep it for several more years (or until Tesla brings out a proper SUV). This post is really having me reconsider things. My PCS2 just went out now (38,000 miles), and fortunately I'm not going to be stuck with the repair bill because I'm within the warranty period.

But what happens if it goes out again out of warranty? I'm almost certainly going to be out of warranty by the end of the year due to the amount of driving I'll be doing for the remainder of the year. That's going to be an expensive bill, and it's going to make me reevaluate my statement "the best vehicle I've ever had."

 

[UberNoob]

I have really enjoyed my Cybertruck--the best vehicle I've ever had. Considering that and that it's paid off, I wanted to keep it for several more years (or until Tesla brings out a proper SUV). This post is really having me reconsider things. My PCS2 just went out now (38,000 miles), and fortunately I'm not going to be stuck with the repair bill because I'm within the warranty period.

But what happens if it goes out again out of warranty? I'm almost certainly going to be out of warranty by the end of the year due to the amount of driving I'll be doing for the remainder of the year. That's going to be an expensive bill, and it's going to make me reevaluate my statement "the best vehicle I've ever had."

to my knowledge revision G has not yet failed and is the version they are supplying now. As for the repair bill, it’s about 900$. Just had mine done about 3 weeks ago at 72k miles. I’d definitely buy this tuck again if I had too.

 

[Edphonse]

@Edphonse
Your discussion has been summarized by this article:
https://www.torquenews.com/17998/cy...0-miles-now-he-s-dealing-second-failure-30000
Is this fair use?

Click bait journos using AI to create hit pieces based on discussions in a public forum? Can't do much about that. My truck isn't full down, even with the PCS2 offline now, I can still supercharge. They also just copy pasta, which is basically all AI can do, not realizing rev "Echo" was me speaking phonetically of Rev "E"... sure the part failed at 30,000 miles, but my battery degradation is still sitting at 0% so that's pretty good for 2 years and 30k miles.

It's funny to see them trying to throw shade, meanwhile I just saw a video covering a guy's gmc getting its 4th engine by 19000 miles. 800v <-> 120/208/240vac bi directional power plant is fairly new tech, things will break/fail. Meanwhile, gmc has been making engines for close to a century and can't seem to figure that out?

 

[zach]

Same here for mine. SAWD or a R2 Rivian. Whomever gets me the order first.

Price offered was insanely high.

to my knowledge revision G has not yet failed and is the version they are supplying now. As for the repair bill, it’s about 900$. Just had mine done about 3 weeks ago at 72k miles. I’d definitely buy this tuck again if I had too.

I've heard about $5000+ repair bills, but $900 is a lot easier to swallow if I have to do it in the future. Let's just hope it never goes out again when I get it fixed. I definitely wanted to put 100k+ miles on it.

 

[vandytom]

to my knowledge revision G has not yet failed and is the version they are supplying now. As for the repair bill, it’s about 900$. Just had mine done about 3 weeks ago at 72k miles. I’d definitely buy this tuck again if I had too.

No other Tesla has this issue so definitely can be solved. It’s not rocket science. Even if it is, Elon knows rocket .

 

[REM]

No other Tesla has this issue so definitely can be solved. It’s not rocket science. Even if it is, Elon knows rocket .

It's not a widespread issue, but there have definitely been some PCS failures in other models; mainly the Y since that's the highest volume vehicle (for now).

Our issue is unique because we can drive 40 amps at 240 volts while having to power a brand new v48 system bus.

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