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Home >> Chevrolet >> 2023 >> Tahoe SSV >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 6 (Engine Controls And Fuel - 3.0L (Lm2) Diesel - Diagnostic Information And Procedures (2 Of 5)) >> Diagnostic Information and Procedures >> DTC P0401, P049B, P04D9, P04DA, P04DD, P04DE, P131F, or P2D1C >> Circuit/System Description

Circuit/System Description

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

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.

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

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