- 2014 Factory-verified
Police guide only. Trim marks in the 2014 guides: Police: O.
1LR Factory-verified
Also described as Brake system, modified police city brake package
Documented applications
- 2016 Factory-verified
only in: Police Vehicle: A; the lists read brake system modification, optional; the 2017 shared list also prints it, but no Tahoe page of 2017 or later in the sources does, so 2017 is not claimed
This page aggregates every documented appearance of 1LR in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.