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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 97 (6.7L Diesel - DTCS - P0008 To P040C - 3500 Cab & Chassis) >> Diagnosis and Testing >> P0401-EGR System Performance >> Code Description >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes 
EGR SYSTEM LEAK
INTAKE AIR SYSTEM LEAK
AIR FILTER RESTRICTION
EGR COOLER LEAK
EGR COOLER FOULING
CROSSOVER TUBE RESTRICTION
INTAKE AIR HEATER RESTRICTION

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE - 6.7L  .