My turn for lifter failure at 7,246 miles on the wife's Escalade Sport not on my AT4.
Happened this week during slow acceleration at around 40mph, car started shuddering, engine warning light flashed, traction control light came on. On the dash got a number of warnings (Service Stabilitrak, Rear Axle System Off & Service Traction Control). Also the air suspension dropped to 'improve stability'. Additional noise from under car from transmission tunnel.
More importantly, hence the post here, the recovery truck driver said this was the 5th GM lifter failure he had done recently when I mentioned it was probably lifter issue (no way of confirming his comment but it was an interesting response from him). So I suspect issue is pretty widespread when additionally you consider the replacement parts are on backorder (dealer has found some from another dealer and due for delivery next week). Overall will be out of service for 2 weeks.
The AT4 (built 12/20) has done just 6k miles & I hope I am not about to see the same on the truck.
Frustrated with GM but have to say dealership have been great.
