Clicking noise from direct injection injectors on Pontiac Solstice GXP

Problem Description and Possible Solution
The fuel injection system for the 2.0L turbo engine places fuel directly into the combustion chambers. This is called "direct injection". Due to the high fuel pressure associated with this type of system a noticeable clicking noise can be heard from the fuel injectors.
Problem Data
RepairPal Verified
Average mileage: 39,100 (7,200–71,000)
3 model years affected: 2007, 2008, 2009
5 people reported this problem
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Cliking noise from the injectors