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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 435 (6.7L Diesel - DTCS P1209 To P2281 - 2500 Hd & 3500 Hd) >> Diagnosis And Testing >> P203C-(Diesel Exhaust Fluid) REDUCTANT Level Sensor Circuit Low >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2013 RAM 3500 HD and 2013 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes 
DIESEL EXHAUST FLUID TANK LEVEL SENSOR 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
DIESEL EXHAUST FLUID TANK LEVEL SENSOR 5-VOLT SUPPLY CIRCUIT OPEN/HIGH RESISTANCE
DIESEL EXHAUST FLUID TANK LEVEL SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
DIESEL EXHAUST FLUID TANK LEVEL SENSOR SIGNAL CIRCUIT OPEN/HIGH RESISTANCE
DEF TANK LEVEL SENSOR SIGNAL CIRCUIT SHORTED TO THE DIESEL EXHAUST FLUID TANK LEVEL SENSOR RETURN CIRCUIT
DEF SUPPLY PUMP ASSEMBLY
DIESEL EXHAUST FLUID DOSING CONTROL UNIT

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to  STANDARD PROCEDURE  .