Whistle Noise From Inside Vehicle – 2014-2019 Cadillac, Chevrolet & GMC

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Bulletin No.: PIT5272B
Published date: 11/13/2018

Preliminary Information

PIT5272B Diagnostic Tip: Whistle Noise from Inside Vehicle

Models

Brand:	Model:	Model Years:	VIN:		Engine:	Transmissions:
			from	to
Cadillac	Escalade	2015 – 2019	All	All	All	All
Chevrolet	Silverado 1500	2014	All	All	All	All
Chevrolet	Silverado	2015 – 2018	All	All	All	All
Chevrolet	Silverado LD	2019	All	All	All	All
Chevrolet	Silverado 2500/3500	2019	All	All	All	All
Chevrolet	Suburban	2015 – 2019	All	All	All	All
Chevrolet	Tahoe	2015 – 2019	All	All	All	All
GMC	Sierra 1500	2014	All	All	All	All
GMC	Sierra	2015 – 2018	All	All	All	All
GMC	Sierra Limited	2019	All	All	All	All
GMC	Sierra 2500/3500	2019	All	All	All	All
GMC	Yukon	2015 – 2019	All	All	All	All

Supersession Statement

This PI was superseded to add Model Years. Please discard PIT5272A.

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition / Concern

Some customers may comment there is a whistle noise in the vehicle from the driver or passenger side. Some may also state this is present while driving or with the HVAC on and in recirculation mode or the noise will go away or change if HVAC is switched out of recirc, or if a window is cracked open. This could be caused by voids in the body sealer in one or more places.

Recommendations / Instructions

1.) It may be helpful to use a hose as a listening aid to be able to tuck it down along the corners of the IP behind trim to get closer to the source of the noise to help pinpoint areas for focused inspection.

2.) Inspect for voids in the body sealer on the left or right side A-pillar as shown in the pictures below.

A.) It may be necessary to remove the Front Door Body Side Weatherstrip to gain access to the lower A-Pillar to cowl seams.

B.) When looking at the base of the left or right A-Pillar to cowl, it may be necessary to look in through the windshield to locate the missing sealer.

• Inspect for voids in the body sealer at the cowl seam on the right side under the plenum cover cap as shown in picture below

Note: The plenum cover cap must be removed and resealed to perform this inspection.

3.) If voids are found in the A-pillar sealer, repair the voids and retest.

4.) If no voids at the A-pillar were identified or if repair of voids did not completely eliminate issue, inspect for voids in the body sealer at the cowl seam under Air Inlet Grille (wiper plenum) Panel on the left side as in the picture below.

5.) Inspect for voids in the body sealer at the cowl seam on the right side under the plenum cover cap as shown in the picture below.

NOTE: The plenum cover cap (1) must be removed and resealed to perform this inspection.

Warranty Information

For vehicles repaired under warranty use:

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

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