How to confirm if a new Sierra has the High Performance LED Headlamps

[redwngr]

May have found (stumbled across) at least a partial explanation:

 

From the 2017 Sierra changes page:

 

" (PDP)High-performance LED headlamps with GMC signature LED lighting has new RPO code of (T4L)"

 

 

Seems like it's in use now, so RPO code used could depend on build date.

[Reidan]

May have found (stumbled across) at least a partial explanation:

 

From the 2017 Sierra changes page:

 

" (PDP)High-performance LED headlamps with GMC signature LED lighting has new RPO code of (T4L)"

 

 

Seems like it's in use now, so RPO code used could depend on build date.

That makes sense. Thanks.