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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 P11B3, P22B6, P22B7, or P2A01 >> 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 Aftertreatment System Description

Component Description
B195B Nitrogen Oxides Sensor 2 The sensor delivers signals for wide-band lambda, digital lambda and NOx concentration.
K115 Reductant Control Module The control module controls the heating and dosing of the reductant.

NOx sensor s work similar to wide-band O2 sensor s. The sensor s consist of two measuring cells. In the first cell, an electric pump current is used to separate out the oxygen in the exhaust. The NOx remains and is conveyed into the second chamber. Here a second pump current decomposes the NOx into nitrogen and oxygen. The oxygen concentration is measured and from there the NOx concentration can be calculated.

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