NSW Police Commissioner Mick Fuller's son has pleaded guilty to drink driving during a short appearance at Sutherland Local Court.

Jacob Fuller, 20, was charged in September after stopping short of a random breath test (RBT) on the Prince's Highway at Waterfall, south of Sydney.

He was on his P-plates and was driving with a suspended license.

At the time he was charged, police said Mr Fuller's son blew 0.031.

While the blood-alcohol limit for drivers on a full licence is 0.05, P-platers must blow zero to pass a test.

"Subsequent checks of the man's licence revealed it was currently suspended," police said in a statement at the time.

The media confronted the police commissioner's son as he left court — he was flanked by his solicitor who advised his client to remain silent.

Police Commissioner Mick Fuller has campaigned against drink driving. ( AAP: David Moir )

Commissioner Fuller has previously scalded drink drivers publicly.

"The problem is they're playing Russian roulette not with their own lives but with our lives," he told radio station 2GB.

Mr Fuller's case has been moved to the Sydney Downing Centre, and will next be heard on November 7.