Transport mode can be enabled/disabled without using an OBD device. The relevant section from my Rok_Dr manual follows describing how to do it.
17.5. Long Term Vehicle Storage and Transport Mode
The Ineos Body Builder Guide (Ineos 2024b, Section 3.10, pages 46-49) provides useful information on how to prepare the Grenadier for long term storage. It also details how to activate and deactivate Transport Mode (section3.10.3 pages 48-49). When this mode is activated power consumers such as lights and window regulators are deactivated.
@Logsplitter also advises that this also disables the theft/tilt alarm.
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https://www.theineosforum.com/threads/rok_dr’s-exceedingly-unofficial-owner’s-manual-supplement.12415655/post-1333329115)
To activate the transport mode, pull the fuse FC04 (5A) in the Cockpit Electrical Centre fuse box. Deactivate transport mode before starting up the vehicle. To achieve that, simply put the fuse FC04 (5A) back in its place, in the Cockpit Fuse Box.
Cheers
Steve