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Engine-Codes – Generic – P205A

P205A Code - Reductant Tank Temperature Sensor Circuit

Quick Answer

The P205A diagnostic trouble code refers to a malfunction in the reductant tank temperature sensor circuit. Common causes include Faulty reductant tank temperature sensor, Wiring or connector issues in the sensor circuit, Corrosion or damage to sensor components. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P205A indicates Reductant Tank Temperature Sensor Circuit.
Common causes
Common causes include Faulty reductant tank temperature sensor, Wiring or connector issues in the sensor circuit, Corrosion or damage to sensor components.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
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Code P205A Description

The P205A diagnostic trouble code refers to a malfunction in the reductant tank temperature sensor circuit. In modern diesel vehicles equipped with Selective Catalytic Reduction (SCR) systems, the reductant tank temperature sensor plays a crucial role in monitoring the temperature of the diesel exhaust fluid (DEF) in the reductant tank. The DEF is a key component in reducing harmful nitrogen oxide emissions from the vehicle's exhaust gases.

OBDII Code P205A - Reductant Tank Temperature Sensor Circuit
P205A Code - Reductant Tank Temperature Sensor Circuit

Common Causes of P205A

  1. Faulty reductant tank temperature sensor
  2. Wiring or connector issues in the sensor circuit
  3. Corrosion or damage to sensor components
  4. ECM software issues
  5. Overheating of the reductant tank

Symptoms of P205A

  1. Check engine light illuminated
  2. Reduced engine performance
  3. Poor fuel efficiency
  4. Failed emissions test
  5. DEF system fault warning message

How to Fix P205A

  1. Begin by diagnosing the issue using a diagnostic scan tool to retrieve the specific fault code and pinpoint the exact cause of the problem.
  2. Inspect the reductant tank temperature sensor, wiring, and connectors for any signs of damage, corrosion, or loose connections. Repair or replace as necessary.
  3. Clear the fault code from the ECM memory and reset the system to see if the issue persists.
  4. Test drive the vehicle to ensure that the repair has resolved the problem and that the check engine light does not reappear.
  5. If the issue persists, consult a professional mechanic or dealership for further diagnosis and repair, as it may require more in-depth troubleshooting or replacement of components such as the ECM or reductant tank temperature sensor.

Cost to Fix P205A

The typical repair costs for resolving a P205A code related to the reductant tank temperature sensor circuit can vary depending on the specific cause of the issue and the type of vehicle. In general, the cost of parts such as a new reductant tank temperature sensor or wiring components can range from $100 to $300. Labor costs at auto repair shops typically fall between $80 and $150 per hour, with the total repair cost likely ranging from $200 to $500. However, these estimates are indicative, and actual costs may vary based on factors such as location, vehicle make and model, and labor rates. It is recommended to consult with local auto repair shops for a more accurate cost estimate.

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Code P205A Information for Specific Makes

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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