- 2006–2009 Factory-verified
the 2009 list adds "do not use after 2009 M.Y." (model year).
GM Heritage factory kit — 2006 Chevrolet HHR, p.98, p.107, p.117.
N24 Factory-verified
Also documented for Pontiac
Documented applications
This page aggregates every documented appearance of N24 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.