- 2020 Single-source
only in: Denali AWD; includes the Technology Package, the Dual SkyScape sunroof, Adaptive Ride Control and the Trailering Package (GM Authority); 2020: GM Authority 2020 changes page
PEC Factory-verified
Also described as Denali Ultimate PackageLPO, charging essentials package, dealer providedDenali reserve packageDenali Reserve Package
Also documented for CadillacChevrolet
Documented applications
- 2027 Factory-verified
includes RYK, RYW and 5CH
- 2024–2027 Factory-verified
only in: 2500 HD and 3500 HD pickup; includes CWM and power sunroof (CF5); 2024: GM Authority 2024 changes page; Denali: O; Pro, SLE, SLT, AT4, AT4X, Denali Ultimate: not offered
- 2016 Factory-verified
new for 2016; only in: 4WD Denali 1500 (the guide marks it not available on the 2500HD and 3500HD); GM uses PEC for a different package on the Silverado.
- 2025–2026 Factory-verified
- 2018–2019 Factory-verified
Denali: A, new for 2018; includes the PCJ and UTT contents, BRS, Y66 with UGN, JB1 and SII wheels; 2018 from GM's 2018 Yukon order guide
This page aggregates every documented appearance of PEC in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.