TSB: SERVICE ACTION: HYBRID STARTER GENERATOR (HSG) PULLEY NUT INSPECTION AND/OR HSG REPLACEMENT (SA289) - This bulletin provides the procedure to inspect the Hybrid Starter Generator (HSG) pulley nut and, if necessary, replace the HSG assembly on certain Optima JF HEV/PHEV vehicles with a production range from May 31, 2016 to November 22, 2016, which may exhibit a loose pulley nut.
