Engine light on and message board reads 'reduced engine power' on 2003 Cadillac Escalade

After driving and running errands turned on cadillac to have the engine light come on and the message board to read Reduced Engine Power - could not get the cadillac to go over 35mph

Asked by for the 2003 Cadillac Escalade
You have a code situation in your powertrain computer. Any Service Engine Soon Light on, yes? Need to repair those codes, the Caddy goes in to reduced power mode to protect it self from doing more damage.

here are some shops:
1 more answer
You need to go to a GM or Caddy specialist for diagnosis. The light is trying to tell you that the computer detects a fault in the control system.
Here's a directory link for you: