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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 54 (Engine Controls And Fuel - 2.8L (LWN) Diesel - Diagnostic Information And Procedures (2 Of 3)) >> Diagnostic Information and Procedures >> DTC P140B or P140C >> 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: Exhaust Gas Recirculation (EGR) System Description

Component Description
Q14 Exhaust Gas Recirculation Valve The purpose of redirecting exhaust gas back into the intake system is to reduce the amount of oxygen that enters the cylinders. This has the effect of reducing the amount of NOx that is produced during the combustion. The component is actuated by a bidirectional DC motor.
K20 Engine Control Module The control module contains a microprocessor used to process input data to control outputs.
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 sensor s, interprets the data and adjusts the engine actuators accordingly.
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