Coolant Flow Control Valve Actuator Harness Connector Corrosion

The 3.0L Duramax diesel engine (RPO LM2) on some 2020-2021 Silverado and Sierra models and 2021 Tahoe, Suburban, Yukon and Escalade models may have possible terminal corrosion in the coolant flow control valve actuator harness connector. (Fig. 11) The Check Engine MIL may be illuminated and DTC P2B60 (Engine Coolant Flow Control Valve Position Sensor Circuit Performance) may be set.


Fig. 11


Check for corroded terminals at the flow control valve actuator connector. If there is corrosion on the terminals, replace the harness connector.

In addition, inspect the flow control valve actuator pins for any corrosion damage. If the actuator pins are corroded (Fig. 12), replace the coolant control valve.


Fig. 12


If there are not any signs of corrosion on the connector terminals or actuator pins, continue diagnosis for DTC P2B60 in the appropriate Service Information.

For additional information, refer to #PIP5764.


– Thanks to Robert Bastien

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