The TBV should not be replaced again unless it is determined through normal diagnosis that the TBV has failed. The TBV should be replaced with the new valve only once for any transmission repairs, including Customer Concern Not Duplicated (CCND). 9) The “70” stamp is visible on the valve when it is installed on the transmission. The new TBV can be identified by the “70” stamped into the bottom of the valve. The new TBV has a full-open temperature of 158☏ (70☌). The previous TBV had a full-open temperature of 194☏ (90☌). 8)Ī new TBV is available that has a cooler operating temperature. When performing transmission repairs on 2016-2019 Silverado and Sierra models and 2015-2020 Tahoe, Suburban and Yukon models equipped with the 6L80 6-speed automatic transmission (RPO MYC) for harsh shift, delayed shift, shudder, noise or vibration conditions, also replace the Thermal Bypass Valve (TBV).
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