One problem related to air bag not deploy has been reported for the 2001 Chevrolet C/k Pickups. The most recently reported issues are listed below.
My daughter missed a curve in heavy fog and hit a tree head on at about 40-45 mph. The driver side airbag failed to deploy. The impact was a few inches left of center and was such that it moved the engine block back into the cab of the pickup. It should have deployed.