The rear differential stopped working in January, 2025 and went into two wheel drive only. The message lit up on the dash board saying the vehicle was driving in two wheel drive only. We were driving home and the roads were slippery. We brought it to Mountain States Toyota and they confirmed there was a technical service bulletin (0086-19) issued in 2019, due to a Toyota manufacturing problem. It was issued three months after we bought the new vehicle. We were never notified and a recall was never issued in 2019 when Toyota knew about it. I contacted Toyota Brand Engagement and they agreed to pay for half of the $4,800 cost to replace the entire rear differential even though they acknowledged it was a Toyota manufacturing problem and possible safety issue. We don’t understand why we were not notified about the known manufacturing problem that affected the drive train of an all wheel drive vehicle. We also don’t understand why they won’t cover the entire cost of the required repair to make the all wheel drive operational when they acknowledge it is a known Toyota manufacturing problem. We believe it is also a safety issue. Thank you! Toyota repair Invoices #1178424, #1169684