Modern automatic transmissions are pretty complex things and there’s a lot that can go wrong from the simple low fluid level to the catastrophic like a broken torque converter or failed valve body, gearset, oil pump or clutch pack.

But mechanics know that the first sign of this transmission failing totally is a refusal to select Drive. Take the car to a transmission specialist who will have seen these symptoms before and will have a pretty good idea of what’s going on before they even lay a spanner on the car. And be prepared to replace the transmission as the only proper fix.

A second-hand transmission from a wrecked Commodore might be an option, but only if you can prove that the unit has done moderate mileage and, therefore, is probably not about to produce the same symptoms as yours already has.

An automatic gearbox relies on fluid pressure as well as volume to make everything work as it should. So, if the level of fluid is correct, you then need to move on to the pump and accumulators involved to ensure that the correct hydraulic pressure is being applied to the bands and clutches that actually apply drive to the gears and physically move the car.

Your problem could be something as simple as a worn pump, but it could also indicate internal wear and tear that requires a complete transmission rebuild. A transmission specialist is your best bet. The good news is that this is a common and well understood transmission, so finding an expert shouldn’t be difficult.

Let’s start with what made a 2017 Holden Commodore an SV6. Over and above the standard Commodore specification, ordering an SV6 also got you the higher-spec V6 engine with 210kW, 18-inch alloy wheels, FE2 (firmer) suspension, LED daytime running lights, a leather-wrapped steering wheel and a body kit.

The Black Edition package, meanwhile, was a visual enhancement package that could be specified with either a Commodore SV6 or SS (the V8 model) and, in the case of the SV6, added specific black alloy wheels (still 18 inches) a blacked-out grille, black rear lip spoiler, Black Edition badging, satellite navigation, an improved info-screen, red stitching on the seats and specific floor mats.