One problem related to differential unit has 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.
Two times the front differential locked into 4x4 by itself. The truck appeared to slip into neutral and engage into 4x4. The 2 h light was on, not 4 hi. I stopped, pushed 4hi, heard actuator engage, pushed 2hi and 4hi disengaged. This is a serious shock to the whole front running gear, universal s, ring and pinion, and transmission.