Turbo diesel doesn't apply to the P-plate vehicle restrictions.
The 2012 Holden Colorado LX is legal for you to drive.
Quote RTA NSW
The NSW Government has introduced prohibited vehicle and passenger conditions for provisional licences to keep novice drivers safe on our roads. The prohibited vehicle and passenger conditions are described below.
Prohibited vehicles
The prohibited vehicle condition restricts provisional (P1 and P2) drivers from driving certain high performance vehicles. The condition applies to provisional licences issued on or after 11 July 2005. The scheme aims to prohibit young driver access to vehicles that are overrepresented in young driver crashes.
Prohibited vehicles are those with:
Eight or more cylinders.
A turbocharged engine (except diesel).
A supercharged engine (except diesel).
Engine performance modifications that require an engineers' certificate.
Certain high performance six cylinder engine vehicles or other vehicles as described in the publication Novice Drivers - High Performance Vehicle Restrictions.
The following vehicles are not prohibited vehicles and may be driven by provisional licence holders:
Suzuki Cappuccino 2D Cabriolet Turbo 3 698cc (released between 1/01/1992 - 1/12/1997).
Daihatsu Copen L880 2D Convertible Turbo 4 659cc (released from 1/10/2003).
Smart vehicles (all models).
If you are unsure whether your vehicle is prohibited or you would like more information about P1 and P2 licence conditions phone 13 22 13.
The publication Novice Drivers - High Performance Vehicle Restrictions is available to view and download from the box at the bottom of this page. This list will be updated as required.
An additional list, Guide to prohibited eight cylinder, turbo and supercharged high performance vehicles, may also be viewed and downloaded. This additional list is a guide only and subject to change at any time without notice. If your vehicle is not on the list but would otherwise be considered to be a 'prohibited vehicle', you must not drive it, unless exempt.