The vehicle has set ablaze in the Southbound carriageway between Junction 9, for the airport, and Junction 10 for Crawley.
Highways England are reporting that all traffic has been held as a result of the fire, which is in lane one.
They tweeted: ‘#M23 southbound between J9 #Gatwick and J10 #Crawley- there is a car fire in lane 1- #Freerecovery and #Trafficofficers are enroute - please drive with caution through this area.
‘Traffic is currently being held in all lanes on approach due to #Surreyfire on scene and dealing - will hopefully not be for too long.’
Motorists are advised to drive with caution in the area.
For all the latest news, traffic and travel, what’s on, Pompey, sport and breaking stories visit The News’s website.
We will be bringing you all of the latest stories from across Portsmouth and surrounding area throughout the day.
If there is a story you think we should know about, you can contact us via our email [email protected] or via our social media channels – Facebook or Twitter.
Do not contact us while you are driving. To stay up to date with all the latest Portsmouth news follow us on twitter @portsmouthnews or like our Facebook page.
Join The News' WhatsApp service to get the latest Portsmouth news and sport direct to your mobile phone.
To get a daily text alert with the latest headlines, text 'NEWS' to 07393 754804, and add The News as a contact on WhatsApp.
Your number will not be visible to anyone else and you will not receive any marketing messages. Text 'STOP' at any time to stop receiving messages.