P205E Fault Code

Reductant Tank Temperature Sensor Circuit Intermittent/Erratic

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

The P205E fault code indicates an intermittent or erratic issue with the reductant tank temperature sensor circuit. This sensor is crucial for monitoring the temperature of the urea solution used in selective catalytic reduction (SCR) systems, which helps reduce emissions in diesel engines. An erratic signal can lead to improper functioning of the SCR system and increased emissions levels.

What are the symptoms of the P205E code?

Vehicles experiencing the P205E fault code may exhibit:

• Check Engine Light illumination
• Reduced engine power or performance
• Increased emissions or failure to pass emissions tests
• Possible erratic behavior of the SCR system, including improper dosage of the reductant solution

What causes the P205E code?

Common causes of this fault code include:

• A faulty reductant tank temperature sensor
• Wiring issues or damaged connectors in the sensor circuit
• Corrosion or contamination affecting sensor signal
• Software glitches in the engine control module (ECM) leading to incorrect sensor readings

How to fix P205E?

To resolve the P205E fault code, consider taking the following steps:

• Inspect the wiring and connectors related to the reductant tank temperature sensor for damage or corrosion.
• Replace the faulty sensor if testing confirms it is not functioning properly.
• Clear the fault codes from the ECM and perform a test drive to ensure the issue does not reoccur.
• If problems persist, consider updating the ECM software to address potential glitches.