Two problems related to battery have been reported for the 2005 Chevrolet Colorado. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Chevrolet Colorado based on all problems reported for the 2005 Colorado.
Changed the battery. Causes the door switch to go out. The driver's side window, the door locks and keyless entry will not work. You need to hope the window is not down if you change batteries or have a dead battery needing a jump start. The dealer charged me $400 for a new switch. A check of the internet shows many many people have had the same problem.
Left power window, power door locks, clock radio, dome light quit working randomly. Dealer cannot duplicate problem. Onstar doesn't work sometimes. Battery seems to go dead if it sits more than 5 days, remote for door locks range is horrible but they say it's normal to have to stand right next to the truck to unlock / lock it.