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Home >> Chrysler >> 2011 >> 300 Base, Gas >> Repair and Diagnosis >> External Pages >> Different car >> Section 100 (6.7L Diesel - DTCS - P21C4 To U1601 - 3500 Cab & Chassis) >> Diagnosis and Testing >> P249C-Excessive Time To Enter Closed Loop SCR REDUCTANT Injection Control >> 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 
EXHAUST TEMPERATURES NOT HIGH ENOUGH TO ACTIVELY REGENERATE THE AFTERTREATMENT DIESEL PARTICULATE FILTER SUE TO OPERATING IN LIGHT LOAD CONDITIONS
FUEL SYSTEM OR AIR HANDLING SYSTEM SENSOR FAILURE
EXHAUST TEMPERATURE SENSORS FAILED IN-RANGE LOW
BASE ENGINE FAILURE
FUEL SYSTEM FAILURE
AIR HANDLING SYSTEM FAILURE
DOC/DPF CATALYST PLUGGED

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