it is the metal body panels causing this problem you need to remove everything in the back and pull the metal tabs to a 90 degree angle and than grease it. it is mainly coming from the shelved area. So welds need to be bent and than lube. Also replace all the clips under that area.

 

Service Bulletin

JUST RELEASED!!!!

August 12, 2011

11-024

SYMPTOM

The rear shelf area clicks, taps, or ticks on one or both
sides.

PROBABLE CAUSE

There is insufficient clearance between the metal body
panels in the rear shelf area.

CORRECTIVE ACTION

Create a gap between the metal body panels.

REQUIRED MATERIALS

Motorcycle Chain Lube (commercially available)

WARRANTY CLAIM INFORMATION

The normal warranty applies.
Operation Number: 8230C9
Flat Rate Time: 1.0 hour (includes diagnosis)
Failed Part: 66500-TK4-A00ZZ
Defect Code: 07403
Symptom Code: 04201

Skill Level: Repair Technician

 

The dealer took the time to take out the back seat and the Tech went for a ride in the trunk to try to isolate the rattle. Found it. A pinch weld located up and near the passenger side strut. Done under extended warranty. Good work guys!! Way to hang in there to fix the problem.

Don't know specifically what they did to correct but at least I know I wasn't imagining things. I am back on the road and a happy 3G Acura owner again. I plan to keep the car for another 50-60K. Hoping Acura now gets it right with the 5G TL's styling.