James Courtney has been handed a five-second post-race penalty over a Safety Car restart procedure breach.
Courtney crossed the line fourth in Race 12 at the Merlin Darwin Triple Crown.
The #44 Boost Mobile Racing driver finished ahead of Erebus Motorsport rookie Will Brown.
WATCH: RACE 12 HIGHLIGHTS
Brown was initially handed a penalty for a Safety Car infringement, though that was later rescinded.
It was later found that Courtney had gone early on the restart, which came after the race was neutralised over the first-corner melee.
Brown has been promoted to fourth, with Jake Kostecki elevated to fifth.
Courtney has dropped to 10th, behind wildcard Kurt Kostecki, Tim Slade, Brodie Kostecki and Thomas Randle.
Cars will return to the track for ARMOR ALL Qualifying for Race 13 at 9:45am AEST on Sunday.