29110 - Customer Satisfaction Program. (Customer Letter Mailing) Certain 2014-2016 model year Chevrolet Silverado and GMC Sierra model vehicles equipped with a full size spare tire and road wheel (SEO 00A) may have been built without a Tire Pressure Monitoring (TPM) sensor installed in the spare tire. If the spare tire was to be used and the TPMS programmed to coordinate with the wheels in use, a tire pressure monitor system error would be displayed due to the lack of a sensor in the spare tire. Dearler are to add a sensor to the spare tire.