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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 104 (Engine Controls And Fuel - 6.0L (L96 LC8) - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> DTC P0628 >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.

For an overview of the component/system, refer to: Fuel System Description

Circuit Description
Control The output circuit is switched to 12 V to activate the component.
Component Description
K20 Engine Control Module The control module controls a series of actuators to ensure optimal engine performance. The control module does this by reading values from a variety of sensors, interprets the data and adjusts the engine actuators accordingly.
K38 Chassis Control Module The control module K38 monitors the fuel system for any condition which may adversely affect emissions. If a condition is detected it sets a DTC and sends a serial data message to the engine control module which then sets DTC P069E.

When the ignition is turned On, the ECM sends a 12 V signal to the control module K38 to enable the fuel pump. If the engine is not started, the control module K38 turns the fuel pump Off after 6 s.

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