I have the same code on my Range Rover Sport 2015 having google looking for an answer I came across the link above.
The MIL is illuminated on the IPC with Diagnostic Trouble Code(s) (DTC) P0234-77 stored
in the Powertrain Control Module (PCM) which may be accompanied with DTCs P2463-00
and P246B-00.
CAUSE:
Component failure.
ACTION:
Follow the instructions below.
C O N D I T I O N S U M M A R Y :
PART NUMBER DESCRIPTION QUANTITY
LR078546 Intake air shutoff throttle
LR063121 Inlet hose clamp