TSB Document:

• Sorry, the NHTSA has not posted this TSB document yet.

You can still get the detailed info from GMC for this TSB. Call your local GMC dealer's service department & ask for a copy of TSB# 17-NA-265.

Affected Component: EQUIPMENT ADAPTIVE/MOBILITY

Summary

Flutter or Thump Noise from Rear of Vehicle Condition Some customers may comment on hearing a flutter or thump noise from the rear of the vehicle. The noise is most noticeable while driving above 40 km/h (25 mph), with the HVAC off, or in recirculation mode Cause The cause of the condition may be the rear pressure relief valves (PRVs) opening and closing.

Click a tab for more information.