Keyed alike trucks?

[618 Syndicate]

I had an 02 Silverado and an 01 Yukon XL about 15 years ago, either key would unlock the doors but not work in the ignition.

 

[Joe Dirte]

I have a caprice from sheriff dept. Always wanted to see if I could find another from the department n see if they were all keyed the same. Was a RPO code for fleet vehicles. I did lock myself out of the 86 c10 one day at apprentice class. Kid had an 84 c10 n he could unlock mine. I'm guessin wore out keys or locks.