Upgrade inboard PCM at dealership before use
Reviewed By Scott B (Antioch, TN) Reviewed for a 2010 Chevy Colorado —8/8/2012 9:10 PM
got device, plugged it up with excitement only to find it wouldn't work. Called tech support and found out my truck needed updating before I could use. Finally installed but was hoping to correct speedometer due to tire size, still 2.5 mph off. Everything else works as it should now.