How do I fix code P203B?

How To Correct P203B Reductant Level Sensor Circuit Range/Performance

  1. Repair or replace the Exhaust system components.
  2. Repair or replace catalytic converter.

What is P203B?

P203B OBD-II: Reductant Level Sensor Circuit Range/Performance. What does OBD-II fault code P203B mean? OBD-II Code Diagnostic Trouble Code is defined as a Reductant Level Sensor Circuit Range/Performance. Diesel Exhaust Fluid (DEF) is used to assist in converting leftover exhaust particles to harmless gases.

Where is the reductant level sensor location?

Reductant level sensor 1 is located at low reductant level. Reductant level sensor 3 is located at less than half range of the DEF tank level. The scan tool will display Active when the level sensors are in contact with reductant and Inactive when not in contact with reductant.

What is the reductant level sensor?

The Reductant Level Sensor tells the engine computer (PCM) how much DEF is left in the tank. If the PCM detects an implausible signal from the Reductant Level Sensor, code P203D is set. This sensor is usually built into the Reductant Tank.

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