Quote Originally Posted by Taz View Post
If by "K2XX" you are referring to 2500 series 4x4 models - I believe those are still using the E78 ECM in the Canadian and USA markets. Mexico ... well just about anything could happen there !!!
K2XX is just the generic name for the 2014/2015+ GM full size truck/SUV platform. The "XX" can be various different letters to denote which specific vehicle within the platform.

Sort of like "GMT-900" "GMT-800", etc. And then there are more specifics, like GMT-931 is an Avalanche, etc.

2014+ Chevrolet Silverado Crew Cab (K2CC)
2014+ GMC Sierra Crew Cab (K2CG)
2014+ Chevrolet Silverado Extended Cab (K2EC)
2014+ GMC Sierra Extended Cab (K2EG)
2014+ Chevrolet Silverado Regular Cab (K2RC)
2014+ GMC Sierra Regular Cab (K2RG)
2014+ Chevrolet Tahoe (K2UC)
2014+ GMC Yukon (K2UG)
2014+ Chevrolet Suburban (K2YC)
2014+ GMC Yukon XL (K2YG)
2014+ Cadillac Escalade (K2XL)