Cars Technical Articles - Water Pump Failure and DTC P2B85

Water Pump Failure and DTC P2B85

- Edited: Aug 19, 2022
- Popularity: 18 Views

Makes:

GMC

Vehicles Affected:

  • 2020 Cadillac CT4
  • 2020-2021 Cadillac CT5
  • 2020-2021 Chevrolet Silverado 1500
  • 2020-2021 GMC Sierra 1500

Condition:

Certain 2020 model year Cadillac CT4 and 2020-2021 model year Cadillac CT5, Chevrolet Silverado or GMC Sierra 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.

Correction:

Dealers will replace the water pump.

Service Procedure:

Replace the electric water pump assembly.

Water Pump Failure and DTC P2B85