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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 25 (ENGINE CONTROLS - 6.6L - DIAGNOSIS (DTCs P0016-P0401)) >> DTC P0401 >> Circuit/System Description

Circuit/System Description

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The engine control module (ECM) tests the exhaust gas recirculation (EGR) flow when the EGR is In operation. EGR desired flow is compared to EGR actual flow. If EGR flow deviation is detected, DTC P0401 or P0402 will set.

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