Detailed Description of Error P205C

OBDII error code P205C is a generic trouble code that indicates a problem with the Reductant Tank Temperature Sensor Circuit. The reductant tank is a critical component of the Selective Catalytic Reduction (SCR) system, which is used to reduce nitrogen oxide emissions in diesel engines. The reductant tank temperature sensor is responsible for monitoring the temperature of the Diesel Exhaust Fluid (DEF) in the tank.

The P205C error code is set when the Engine Control Module (ECM) detects a low voltage signal from the reductant tank temperature sensor circuit. This can cause the SCR system to malfunction, leading to reduced engine performance, decreased fuel efficiency, and increased emissions.

Possible Causes of Error P205C

• Faulty reductant tank temperature sensor
• Corrosion or damage to the sensor wiring or connector
• Low DEF level in the reductant tank
• DEF quality issues or contamination
• Faulty or corroded reductant tank heater
• ECM software or programming issues
• Wiring or circuit issues between the sensor and ECM

Possible Fixes for Error P205C

• Inspect and clean the reductant tank temperature sensor and wiring
• Check the DEF level and top it off as needed
• Inspect the reductant tank heater and replace it if necessary
• Use a scan tool to monitor the sensor voltage and check for any ECM software updates
• Perform a DEF quality test to ensure it meets the manufacturer''s specifications
• Consult a professional mechanic or dealership for further diagnosis and repair