Engine Rattle Sound from Purge Solenoid

A loud ticking or rattle sound may be heard coming from the engine compartment on some 2020-2021 Enclave and Traverse models equipped with the 3.6L V6 engine (RPO LFY). The sound may be caused by pressure pulsations in the purge solenoid tube that occur when the purge solenoid is commanded on. The pulsations create an audible rattle or tick sound that can be heard inside and outside the vehicle.

To correct this condition, verify the noise is coming from the purge tube by commanding the purge solenoid on and off. If the noise can be duplicated, it will be necessary to install insulator/dampers on the tube at the locations noted below.

Two insulators/dampers should be made using two 3-inch (76 mm) pieces of 3/8-inch rubber fuel hose and two 3-inch (76 mm) pieces of 1/2-inch rubber fuel or vacuum/heater hose placed on the outside of the 3/8-inch hose. Split the hoses lengthwise and install each insulator/damper (Fig. 24, #2) with the seam facing down at the specified locations on the purge tube. (Fig. 24, #1) Secure the insulator/dampers using two tie straps on each one.

 

Fig. 24

 

A damper to further dampen the sound is being developed. Refer to #PIP5796A for additional information.

 

– Thanks to Aron Wilson

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