- 2019–2020, 2022 Factory-verified
the Silverado T1XX doc reads "Air conditioning, single-zone manual"
C4P Factory-verified
Also described as Air conditioning, single-zone manual
Also documented for BuickChevrolet
Documented applications
- 2019 Factory-verified
SL, SLE: S
This page aggregates every documented appearance of C4P in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.