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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 971 (6.7L Diesel - DTCS P0305 To P063C - 2500 Hd & 3500 Hd) >> Diagnosis And Testing >> P0420-Catalyst Efficiency Below Threshold >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2015 RAM 3500 HD and 2015 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes
AFTERTREATMENT DIESEL OXIDATION CATALYST HAS BEEN REMOVED FROM THE VEHICLE
AFTERTREATMENT DIESEL OXIDATION CATALYST IS DAMAGED OR NOT FUNCTIONING PROPERLY
AFTERTREATMENT DOC INLET/OUTLET TEMPERATURE SENSORS OR THE DPF OUTLET TEMPERATURE SENSOR ARE DAMAGED/FAILED
IMPROPER FUELING
WIRE HARNESS

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

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