P205A Fault Code

Reductant Tank Temperature Sensor Circuit

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

The P205A fault code indicates a problem with the reductant tank temperature sensor circuit in a vehicle's emissions control system. This sensor plays a crucial role in monitoring the temperature of the diesel exhaust fluid (DEF) stored in the reductant tank, which is vital for the effective operation of the diesel catalytic converters. Proper temperature readings ensure the effective use of DEF to reduce nitrogen oxide (NOx) emissions.

What are the symptoms of the P205A code?

When a P205A code is triggered, the following symptoms may be observed:\n- Warning lights illuminated on the dashboard (Check Engine light)\n- Poor engine performance or decreased fuel efficiency\n- Emissions control system malfunction alerts\n- Possible reduced power in certain driving conditions due to limp mode activated by the ECU

What causes the P205A code?

Several factors can cause a P205A fault code. Common causes include:\n- A malfunctioning reductant tank temperature sensor\n- Damaged wiring or connectors in the temperature sensor circuit\n- An open or shorted circuit\n- Problems with the Engine Control Unit (ECU) not processing the sensor signal correctly\n- Contamination or physical damage in the reductant tank

How to fix P205A?

To address a P205A fault code, the following steps should be taken:\n- Begin with a diagnostic scan to confirm the fault code and check for related codes\n- Inspect the reductant tank temperature sensor for signs of damage or failure\n- Examine the wiring and connections for any signs of wear, corrosion, or disconnection\n- Test the sensor's resistance and voltage output to determine if it is functioning properly\n- If the sensor is faulty, replace it with a new one, and clear the fault codes from the ECU\n- If issues persist, further evaluate the ECU and other related components of the emissions control system