While driving the car it suddenly, and without warning, abruptly slowed to a stop and the display showed ‘propulsion power is reduced’, then the ‘service soon’ symbol came on. This could have happened in fast moving traffic, which definitely could cause multi-car collisions. The GM service bulletin (Document ID: 5409616, revised February 13, 2023- see attached copy) states that this is likely due to ‘a spread terminal on the vehicle harness connection X2 on the T12 transmission assembly. The terminals may not have been perfectly aligned during installation at the vehicle assembly plant.’ This is a known, dangerous, malfunction, and GM has not issued a recall for it. The ‘correction’ is to replace the ‘engine wiring harness’ which gs to the EV motor. GM is also not covering this repair under any extended warranty, although it’s a safety issue and really should generate a recall. Please see attachment.