To better assist you if you need to get back with me, please tell me if your model is just a Escalade or and EXT. Also the engine size in liter and the 5th and 8th digit of your VIN.
According to the manual you can use both but there may be some difference in the codes. I have attached that info for you.
PCM is equipped with a self-diagnostic system which detects system failures or abnormalities. When a malfunction occurs, PCM will store a Diagnostic Trouble Code (DTC) and, in most cases, illuminate the Malfunction Indicator Light (MIL) located on instrument cluster.
There are 2 paths for accessing on-board diagnostics. It is necessary to access information through both paths, as each path presents some different information.
" Generic OBD-II
This provides all generic codes and some OEM codes, serial data PIDs required for generic OBD-II and some OEM PIDs, monitor status, pending codes and freeze frame.
All DTCs, all PIDs, failure records, enhanced scan tool information and all other OEM scanner functions.
Friday, February 13th, 2009 AT 5:17 PM