P2021 car going into limp mode at 5500rpm

LTZ_STI

New member
p2021 5500 rpm cut off
Posting this for a friend he knows what the code is but I wondering why it cuts out while under load but neutral or with the clutch engaged its fine

my 05 sti is cutting out at 5500 rpms when i have a load on it. i have a code for p2021 (intake manifold runner position sensor bank 2) would that cause this to happen or do i have another problem? a couple months ago i got a code for a small vacuum leak but it never came back. i also checked that today thinking it might be cracked off the intake manifold but i couldnt find anything.

Mods:
Cobb tuner stage 1
hks catback
turbo xs bov
perrin intake

I also have an hks up pipe and down pipe but i have not installed them yet because i want this problem gone first.
 
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