Display message "engine capacity reduced" what could reason for this?
Oddly, I can't find anything in the owners manual about that. So, if it's NOT in Limp mode if it has the usual amount of power
Wait, I did find it. Chapter 3 Page 69: ENGINE POWER IS REDUCED This message displays and a chime sounds when the cooling system temperature gets too hot and the engine further enters the engine coolant protection mode. See Engine Overheating on page 5-32 for further information.
It leads you around in the manual to different sections. I highly recommend you read up on what is going on. If you don't have the manual, download it from the link: http://justgivemethedamnmanual.com/chevrolet/2008-chevrolet-silverado-owners-manual
Looking for a Used Silverado 2500HD in your area?
CarGurus has 31,456 nationwide Silverado 2500HD listings starting at $1,950.
Search Chevrolet Silverado 2500HD Questions
Chevrolet Silverado 2500HD Experts