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Home >> Buick >> 2000 >> Century Custom >> Repair and Diagnosis >> External Pages >> Different car >> Section 106 (Engine Control System Self-Diagnostics - 3.8L) >> Diagnostic Tests >> DTC P0401: EGR Insufficient Flow Detected >> Test Description
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Test Description

WARNING: This page is about a different car, the 2002 Pontiac Firebird and 2002 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.

The number below refers to the step number in the diagnostic procedures.

  1. 2

    This DTC is set when the PCM does not detect a predetermined change in the MAP when the EGR valve is commanded. This step checks for any MAP sensor DTCs. A malfunctioning MAP sensor may cause this DTC to set.
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