2025 Macan 4 on latest FW incompatible with Tesla Gen 2 HPWC?

[atebit]

My wife picked up her CPO 2025 4S last Saturday. We brought it home after the ~1.5 hour drive back from the dealership and plugged it into my Tesla Gen 2 HPWC eith, and the car charged fine and reached the set charging threshold.

Then, something interesting happened. The car stopped charging as expected. But then about two minutes later there was some contactor activity from the car, then the HPWC’s indicator started flashing red six times in a row. After a few minutes, the HOWC briefly reset to solid green, but after a few seconds went back to flashing red. This cycle repeats a few times until the HPWC shows solid red. At that point the HPWC requires holding its reset button to get it working again. But if it’s left plugged into the car where the SOC >= the charging threshold, the same dance of death continues to happen.

I couldn’t find much online about this specific problem, so I asked chatGPT. Here’s what it thinks:
Understand the Core Issue

• HPWC expects a current request within ~2 minutes of plug-in.
• Macan above SOC threshold doesn’t request current → HPWC faults (6 flashes).
• Once faulted, HPWC locks charging until reset.

I called the selling dealer, they looked up the VIN and said the fw was upgraded to the latest when it was CPO’d, and was still at the latest rev. I’ve read about a patch to that update in the Home Charging Problems” thread, but I don’t know if the patch would help address this particular issue.

I also reached out to David at the UMC-J1772 store about the Tesla Tap being the culprit, but according to him (and he would certainly know), the adapter simply passes the pilot signal (or lack of one) from the car to the HPWC.

Is anyone successfully charging their 4/4S T home with a Gen 2 HPWC/Tesla Tap ?

Sponsored

 

[robrain]

2025 4S, not updated. My Tesla box occasionally exhibits the symptoms you describe and the car fails to charge. It’s easiest for me to just disconnect the car, trip the breaker for the Tesla box, wait a few seconds, power it back on. Always fixed the problem.

its only been a handful of times and it never happened with the Tesla Model 3.