For every fourth warning issued to a team, whether during a championship (points) or non-championship (non-points) event, the loss of pit stall selection will be enforced. If the fourth warning is issued before pit selection has occurred, the loss of pit selection will be assessed at that event. If the fourth warning occurs after pit selection has already taken place, the penalty will be enforced at the next points event.
The modification of the rule takes effect immediately. Any previous warnings issued to teams prior to Wednesday have been rescinded. Once a team has served its penalty, it begins the next event with a clean slate and no warnings on its record. Also, warnings will not carry over into the following season.
Previously, the loss of pit stall selection was just one possible penalty for teams that incurred two warnings during the same event, or two warnings during consecutive events. Other penalties included: track time deductions for practice; track time deductions for qualifying; delay in order of inspection; selection for post-race inspection; specified time delay before unloading vehicle at track; temporary suspension of annual hard card credential(s); reduction or suspension of other event privileges; community service. NASCAR.com