Thanks for the post, had a similar issue recently, same DTC, interestingly not towing or under heavy load, just cruising steady at 100kmh. The code I received was P2263-22, restricted performance came up.
cleared code by itself after shutting the engine down. It reoccurred the following day. Took it into Southern Landrover for a check in case it was the turbo actuator. They could not determine where the code came from, turbo actuators both fine.
With the engine off I used a smoke machine kit (uses baby oil which creates a thick white smoke) and the required adaptors to seal the intake just after the MAFs. Even wedged the throttle wide open and ran the smoke for about 30 sec to fill the intake and throttle body, then checked all over for escaping smoke, I couldn’t see any. I even stuck the smoke maker up the exhaust pipes as sometimes a leak at the exhaust side can apparently cause this code. No smoke detected.
Next step is to check and clean MAFs and MAP. I’ve replaced throttle body y piece o-rings and the main plenum to throttle body seals last June.
Also planning to do an injector bleed off check, will report back how that goes.
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