I plugged my X90D in a half-hour ago and got a red ring at the port and an error, "Charge cable fault. Check manual". The light on the charge cable wall unit was flashing red 3x, repeatedly.
I unplugged, re-plugged the car a couple times. Nothing. I checked fuses (fine). I checked voltage with a multimeter (fine). And, I could not find any real answers to this (or anything useful online or in a manual). Also, while the car was unplugged, I unplugged the charger (NEMA 14-50) from the wall a couple times. Same result; red light flashing 3x. I did a software reset, with the brake pedal depressed and thumbs on both steering wheel buttons. No luck. Even my phone was telling me that there would be no charging until the problem was addressed.
Called local SC; closed for the day.
Then, unintentionally, while the car was still plugged in, I unplugged the charge cable from the wall and then plugged it back in. Realizing this may have been a gigantic mistake, I froze for about three seconds - only to see the familiar green light on the cable unit turn back on! The car is now charging.
I'm not sure if this is coincidence, dumb luck, or an actual workaround.
Just sharing in case someone else has a better idea or explanation.