This bulletin applies to 2013-2014 Acura RDX AWD vehicles. In cold ambient temperatures (below freezing) a vibration may be felt in the front seats and floor at highway speeds during light throttle operation. The probable cause: the rubber in the drive shaft companion flanges absorbs vibration poorly in cold temperatures. The corrective action is to replace the propeller shaft assembly.
40100-TX4-A02........propeller shaft assembly
90113-S10-000........12-pt 8mm x 21 bolt (8 required)
90382-SH9-003....... flange bolt 10mm x 29 (2 required)
Make sure the vehicle is cold soaked before the test drive. Test drive, paying close attention to the speed ranges when the vibration occurs and where it occurs.
Pull over safely to the side of the road and disconnect the rear rocker arm oil pressure switch connector, disabling the VCM operation.
Drive the vehicle under the same conditions that caused the vibration to occur. If the vibration still occurs, this bulletin does not apply. If the vibration is gone, perform the following repair procedure.
Remove the No. 1 propeller shaft protector.
Remove the No. 2 propeller shaft protector.
Remove the No. 1 propeller shaft flange bolts.
Remove the center support bearing mounting bolts.
Remove the No. 2 propeller shaft flange bolts.
With the help of an assistant, install a new No. 1 propeller shaft to the transfer companion flange and loosely install the new flange bolts.
Install a new No. 2 propeller shaft onto the rear differential companion flange and torque the No. 2 flange bolts to 24 ft-lb (32 Nm).
Install new center support bearing mounting bolts and torque to 29 ft-lb, then torque the No. 1 flange bolts to 24 ft-lb.
Install the No. 1 and No. 2 propeller shaft protectors and torque the bolts to 16 ft-lb.
Lower the vehicle to the ground and test drive at 55 mph and check for noise and vibration. If there is no vibration, go to Step 11. If there is a vibration, make a reference mark across the No. 2 propeller shaft and the rear differential companion flange, then rotate the propeller shaft 180 degrees from the mark and re-check. Note that the rear rocker oil pressure switch coupler should still be disconnected during the test drive.
Reconnect the rear rocker oil pressure switch coupler and clear any DTCs.
Always install new flange bolts and torque to spec.
Install new support bearing bolts as well.