[66newb]

Originally Posted by fsc66

See attached, a wealth of information. Check on page 8. The last 2 letters are ECL codes (Exception control letters). They change based on the family of options the car or truck has.

https://www.gmheritagecenter.com/doc...olet-Truck.pdf

Paul Winvoices

Looks like the link updated, I did a quick look and I think this is the current location.

https://www.gm.com/content/dam/compa...olet-Truck.pdf

I know this thread started quite a while ago, did we ever come to a hive mind consensus for the ECL codes? I have one that says Z62AA, curious what the AA means.