How do you remove the Holden VE clutch fluid restrictor for faster gear changes ?

The vehicle not moving could be a separate issueto the P code. Have you been having issues with gear changes before this, Crunching or grinding noises? Have you noticed any leaks under the vehicle? The most common reasons for no movement is low transmission fluid, a worn out clutch or failed clutch.
The trouble code refers to an emissions and performance part called the "Secondary Shutter Valve" (SSV). This code will not stop the vehicle moving but it could affect how the car behaves. The vehicle could 'stutter' or 'Buck' as you use the accelerator pedal.
Repairing time for this will depend on what and where the issue is with the SSV system.

P0660 - Secondary Shutter Valve Open

Alleged to be in a manual on page 164, but there is some issue with that service discussed. Read the following:

https://forums.justcommodores.com.au/threads/ssv-vf2-sat-nav-poi-speed-cameras.253076/


https://forums.justcommodores.com.au/threads/ssv-vf2-sat-nav-poi-speed-cameras.253076

is this a stick shifted car?
the clutch slip is easy to detect, (m/t) the rpm rises, and speed not. (ive burned up many a clutch racing, so know them, and fixed them all self)
yes, adjust the clutch free play , if cable system it gets way off
as you drive, tighter and can cause slip as free play passes ZERO.

most likely an rpm limiter sensor that prevents you from blowing the motor
moving from 1st to 2nd or any gear should be done at no more than 4000 rpms as the engine is outside the torque range and is just a waste of fuel

follow the earth cable for the battery it will be bolted to the chassis there are earth return points at various pointa around vehicle , all bolted to the chassis/body usually black wires

have the fault codes read
indicates a problem in the torque converter clutch servo/ solenoid or wiring
Take it to a professional auto transmission specialist for a proper diagnosis

I suspect that changing the tranny oil will not solve your problem. At best when the pan is removed to change the oil filter you will probably find clutch parts in the sump. However having said that take it to a tranny shop and have the pressures tested before doing anything else

You can't you need a scanner or a code reader.

The resivior for the clutch is under the hood on the driver's side outside the Brake master cylinder. You should be able to look through the plastic housing to read the fluid level [ between the lines ]. If it needs fluid, it takes DOT 3 brake fluid, be careful to wipe any dirt or gunk off the cover before removing it. The fluid has to be checked from under the truck by removeing the plug on the side of the transmission, the level should be just under the opening. The type of fluid depends on the transmission that's in the truck [ an autoparts store should be able to help you with that ].
These fluid levels should not affect the clutch as far as slipping, oil or grease leaking onto the clutch will or a weak pressure plate will cause it. Plowing in to high of a gear also will put tremendous strain on the clutch, I would recommend plowing in the lowest gear practical, if 4wd. put the transfer case into 4wd lo range- you can always use the transmission gears to go faster.

If hydraulic actuated mechanism, loss of fluid, defective master cylinder or slave cylinder at the clutch. Missing pin or other part between slave cylinder and clutch arm. Loose or broken slave cylinder mounting. Missing pin or broken part between pedal and master cylinder. If mechanical linkage, look for broken components or missing pins at moving joints. If you tried to shift into gear with engine running, you may have damaged the transmission gears.