Jeff,

By "rear deck" -- do you mean the rear shelf (where speakers and the HV battery vents are) or do you mean the trunk lid? If the trunk lid, it may be the license plate vibrating against the trunk lid. I fixed this by putting small Velcro pads between bottom part of license plate and the lid.

John


2007 TCH -- Desert Sand, Bisque -- Original Equip: Leather Seats; NAV; Moonroof; Heated Seats
Completed Mods: Moved the side "HYBRID" emblem/badge to trunk lid; Mud Guards (Colored); Back-up Sensors; Door sill protector; ScanGauge II; Front Bra (Clear LLumar); Window Tinting (40 % Charcoal LLumar); Rear Deck Lid Spoiler
Mods in progress: None
Future mods: Rear bumper appliqué, Sliding Center Armrest