OBD II Fault Code

  • OBD II P203E

OBD-II Code Diagonostic Trouble Code is defined as a Reductant Level Sensor Circuit Intermittent/Erratic

Diesel Exhaust Fluid (DEF) is used to assist in converting leftover exhaust particles to harmless gases. In order to burn off those particles, the temperature of the exhaust system needs to increase. the injection of DEF Fluid into the exhaust stream brings Diesel Particulate Filter (DPF) up to temperature. The system is then able to convert harmful NOx to Nitrogen, Carbon Dioxide, and water. The Reductant Catalyst (SRC) was added to further reduce any NOx was still in the exhaust stream. 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 P203E is set. This sensor is usually built into the Reductant Tank.

Common Problems That Trigger the P203E Code

  • DEF tank is damaged
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