One problem related to steering rack and pinion has been reported for the 2005 Chevrolet Trailblazer. The most recently reported issues are listed below.
2005 Chevrolet Trailblazer had problems with power steering. Upon inspection mechanic determined the rack and pinion needed to be replaced. The rack and pinion were replaced but the vehicle began making humming noises again. The vehicle was taken back to the dealer who believed the problem was again with the power steering. The noise returned and this time the technician though it was the power steering pump.