Some 2021 Silverado 1500 and Sierra 1500 trucks equipped with the 5.3L V8 (RPO L84) and 10L80 10-speed automatic transmission (RPO MQB), excluding models with RPO YK9, may have a shudder condition when coasting to a stop between 15—13 mph (24—21 km/h). (Fig. 10) The shudder may feel similar to driving over rumble strips on the pavement when the vehicle is coming to a stop.
During diagnosis, the shudder condition will be easily duplicated every time the vehicle coasts at the affected speeds. The shudder may be due to t