P205C Fault Code

Reductant Tank Temperature Sensor Circuit Low

• What does that mean?
• Symptoms
• Causes
• Solutions

The P205C fault code indicates a problem with the reductant tank temperature sensor circuit, which is responsible for monitoring the temperature of the diesel exhaust fluid in the tank. This sensor is critical for ensuring the correct operation of the emissions system, particularly in vehicles equipped with Selective Catalytic Reduction (SCR) systems. When the sensor reads a low temperature or if there is a malfunction in the circuit, the engine control module (ECM) will trigger this fault code.

What are the symptoms of the P205C code?

Common symptoms associated with the P205C fault code may include:

• A check engine light illuminated on the dashboard.
• Decreased engine performance, including reduced power and efficiency.
• Emission-related warning messages.
• Possible poor fuel economy due to limitations imposed by the vehicle's emissions system.

What causes the P205C code?

Several factors can lead to a P205C fault code, including:

• A faulty reductant tank temperature sensor that cannot provide accurate readings.
• Damaged wiring or poor connections in the sensor circuit.
• A malfunctioning ECM that misinterprets the sensor data.
• Short circuits or open circuits in the wiring harness leading to the sensor.

How to fix P205C?

To address the P205C fault code, consider the following steps:

• Inspect the wiring and connections related to the reductant tank temperature sensor for any signs of damage, fraying, or corrosion.
• Test the temperature sensor with a multimeter to verify its functionality; replace if necessary.
• Ensure that all connectors are clean and securely attached.
• Reset the trouble codes and monitor for any recurrence after repairs are made.