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Home >> Chevrolet >> 2006 >> Cutaway 6.6 2 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 6.6L (LLY) - DTC P0401 To DTC P268A >> DTC P0401 >> Circuit/System Description
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Circuit/System Description

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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