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December 1, 2020 Service bulletin

Customer Satisfaction Program

Chevrolet technical service bulletin N202320510 for 2020-2021 Chevrolet Silverado 1500, 2020-2021 GMC Sierra 1500 and 2020-2021 Cadillac CT5 and others.

Bulletin number
N202320510
Component
Equipment adaptive/mobility
Summary
Customer Satisfaction Program. Certain vehicles, equipped with a gas engine, may have a condition in which the printed circuit board inside of the water pump may have been manufactured incorrectly potentially causing a water pump failure. The vehicle coolant system temperature is monitored and will display multiple warnings to the customer as coolant temperatures rise. At a set coolant temperature, the MIL will illuminate, DTC P2B85 will set in the engine control module (ECM), the oil pressure gauge will indicate high oil pressure and reduced torque with notification to the driver of reduced power will occur. If the customer continues to drive after this warning and the coolant temperature continues to rise, a chime will occur, the AC will be disabled and an additional message instructing the driver to idle will illuminate. If the customer continues to drive the vehicle after all previous warnings and the coolant temperature continues to rise a message the engine will shut down could occur, and the engine will be shut down. Dealers are to replace the water pump.

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