Boom Sound Under Light Throttle

A boom sound or flutter vibration may be noticed on some 2020 Encore GX models equipped with the 1.3L engine (RPO L3T) at low speeds with light throttle input. If these conditions are found, replace the lower radiator mount bushings.

To replace the bushings, first remove the front compartment insulator. With the insulator removed, remove the six front bumper fascia extension bolts (Fig. 10, #1) and the two front bumper fascia extension retainers. (Fig. 10, #2)

Fig. 10

Next, push up on the condenser, radiator and fan module (CRFM) slightly in order to move the bushing holder forward within the vehicle, and then out the bottom. (Fig. 11)

Fig. 11

The lower radiator mounts can now be removed and replaced. (Fig. 12) Be sure to tighten the fasteners for the new mounts to 22 Nm (16 lb.-ft.).

Fig. 12

Refer to Bulletin #20-NA-154 for additional information and part numbers.

– Thanks to Frank Jakubiec

Slipping Output Speed Sensor Reluctor Wheel
GM Service Know-How Emerging Issues

Leave a Reply

Your email address will not be published. Required fields are marked *