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Home >> Chevrolet >> 2024 >> Tahoe Commercial, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Engine Controls And Fuel - 3.0L (Lm2) Diesel - Diagnostic Information And Procedures (2 Of 5)) >> Diagnostic Information and Procedures >> DTC P0401 or P049B >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different variant/trim than selected.

For an overview of the component/system, refer to: Exhaust Gas Recirculation (EGR) System Description

The engine control module can not directly measure the amount of recirculated exhaust gases. To verify the correct operation of the recirculation system, it uses a compare between the fresh air that was measured by the mass air flow sensor and the calculated amount that the engine is expected to suck in. The difference is the amount of recirculated exhaust.

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