This bulletin applies to 2015-2017 Buick LaCrosse and Enclave vehicles. Some customers may comment on a snapping or ticking noise and/or sparks in the engine compartment.

If this is found, it may be necessary to replace the harmonic balancer.  This condition is caused by the rubber compound not meeting the specific material design specification that allows for excessive resistance between the center of the hub to the outside ring of the balancer. 

Replacement harmonic balancer:

Engine RPO............ P/N

LGX......................... 12648346

LGW........................ 12652776

LFX/LLT................... 12674685

LF3.......................... 12603180

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