- 2015, 2018–2019 Factory-verified
2015 marks: Sierra, SLE, SLT: S; 2018: GM's 2018 Sierra 2500HD order guide; 2019: GM's 2019 Sierra 3500HD order guide
CTD Factory-verified
Also described as Cargo tie downs, 4, movable upper
Also documented for Chevrolet
Documented applications
- 2014, 2016–2019 Factory-verified
This page aggregates every documented appearance of CTD in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.