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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 99 (6.7L Diesel - DTCS - P1192 To P21C3 - 3500 Cab & Chassis) >> Diagnosis and Testing >> P20B2-(Diesel Exhaust Fluid) REDUCTANT Heater Control Valve 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 
LOW ENGINE COOLANT LEVEL
BLOCKED OR RESTRICTED COOLANT LINES TO THE DIESEL EXHAUST FLUID ENGINE COOLANT CONTROL VALVE
BLOCKED OR RESTRICTED COOLANT LINES TO THE DIESEL EXHAUST FLUID TANK HEATER
DIESEL EXHAUST FLUID ENGINE COOLANT CONTROL VALVE PHYSICALLY STUCK CLOSED

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