Audio Speaker Noise or Poor Sound

The audio speaker quality may be poor with a buzzing sound or rattle occurring while listening to any music source on some 2015-2016 Colorado and Canyon models. These conditions may be caused by the trim, moldings or water deflectors located in the area of a speaker and may not require speaker replacement.


Before beginning diagnosis, determine the operating conditions that may be contributing to the noise, such as the type of music, audio source, vehicle temperature, time of day, or any outside factors. Also check for any audio system-related DTCs.


TIP: Do not remove any trim or door panels prior to beginning diagnosis because their removal may mask the root cause of the condition.


Speaker Test


Music CDs do not hold tone long enough to diagnose trim rattles, so it may be necessary to obtain a GM Test CD, part number J39916-CD. Most trim rattles are caused by bass frequencies in the range of 50-80 Hz, which is included on this CD.


Insert the GM Test CD and play various tracks corresponding to the type of music the customer was listening to when the condition occurred, Try to isolate the speaker that is experiencing the condition.


When diagnosing a door speaker, be sure to close the doors and windows. If there is noise when closing the door, determine the cause of the noise before any speaker repairs are made.


Loose Trim


To diagnose any interior trim, apply hand pressure to the trim area. If the sound changes, the trim may be causing the rattle or buzz noise. The interface between a door and the instrument panel, such as from loose door trim or a water deflector, may cause the rattle or buzz noise. Inspect for any loose panels, screw covers or contact between trim panels. (Fig. 12)


F12 trim 1

Fig. 12


Water Shield


If the rattle is heard within the door trim, check several locations on the trim with your hand. (Fig. 13)


F13 trim 1a

Fig. 13


If the sound changes when pressure is applied, check the water shield position, inspect the door clips for any damage, remove any loose tape from harnesses or the door trim, and inspect the bottom of the door for any loose material.


If the rattle is caused by the water shield, install two 100 mm (4 in.) long layers of 1” x 9/16” adhesive backed foam shim stock to compress the water shield. (Fig. 14) The foam shipping blocks installed on new vehicle door edges can be used. Be sure that any added foam does not interfere with the window or door lock operation.


F14 trim 2

Fig. 14


For additional information, refer to Bulletin #16-NA-079.


– Thanks to Hassan Abdallah and Sherri Lang



Instrument Cluster DIC Display Dims
Engine Stop/Start Operation after Repairs

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