The 42-year-old is in a rehabilitation centre and therefore was absent from court in the NSW Hunter Valley on Monday when his lawyer entered a plea on his behalf.

Johns wanted the matter dealt with immediately because it is causing him anxiety during his three-month rehabilitation program, lawyer Bryan Wrench told Raymond Terrace Local Court.

But magistrate Ian Cheetham rejected the request, saying the offence was too serious and there was a possibility Johns could be jailed.

Mr Cheetham adjourned the case to June 22 for sentence and ordered Johns contact Corrective Services NSW officers within seven days so a sentencing assessment report could be completed.

Johns lost his licence for three months and was fined $880 in 2015 after he pleaded guilty to one count of mid-range drink-driving in Merewether in 2014.

He was pulled over while driving along Morgan Street where police estimated his black Jaguar was travelling between 70km/h and 80km/h in the 50km/h zone.

''I made a mistake, for which I am really sorry,'' he told reporters outside Newcastle court in 2015.

''I completed the traffic offenders program and it will never happen again.''

On Monday, Mr Wrench had earlier handed the magistrate an extensive report compiled by Johns' defence team, including background information from medical experts and references from his parents and brother, in a bid to avoid having Johns interviewed by Corrective Services officers.

The defence lawyer told the court Johns understood the serious nature of the offence and had been suffering significant mental health issues.

Mr Wrench said Johns was a very reclusive person with a complex range of mental health issues and had been vilified by the media before he was charged with drink driving.

Johns had suffered from reactive arthritis and anorexia where he at one stage weighed 50kg and was so debilitated he couldn't move, the lawyer said.

"He's dealt with the adverse impact of fame he never wanted. He doesn't like it.

"His main focus is his mental health."

Johns was prepared to accept a ban on drinking alcohol as part of any intensive corrections order imposed on him if it meant avoiding jail, Mr Wrench said.

Police said Johns had been three times over the legal alcohol limit when his car crossed to the wrong side of the road and crashed into a van at about 10.30pm on Wednesday, March 23.

He voluntarily admitted himself into a rehabilitation facility after the accident.

Johns had driven his grey SUV out of a service station on the Pacific Highway at North Arm Cove and headed north before crashing into the van. Both vehicles ended up on a nature strip.

Johns was breathalysed and returned a blood alcohol level of 0.157.

The van driver, 51, and his female passenger, 55, were treated at the scene and the woman was taken to hospital.

Johns posted on Instagram the next day to more than 100,000 followers that he was going into rehab.

"As you know, my mental health is a work in progress. I have good days and bad days but it's something I always have to manage," Johns posted.

"Over the last week I began to experience panic attacks. Last night I got lost while driving and I was in an accident. I am OK, everyone is OK.

"I have to step back now as I'm self-admitting to a rehabilitation centre and I don't know how long I'll be there. Appreciate your love and support as always."

The police statement of facts revealed both cars rolled after the collision. But Johns and the couple in the second vehicle managed to escape the wreckage and wait for emergency services.

"The accused (Johns) was asked about his consumption of alcohol and admitted to drinking a bottle of wine and a can of vodka," the statement said.

"The accused stated he was taking prescription medication."

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