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Engine-Codes – Generic – P205C

P205C Code - Reductant Tank Temperature Sensor Circuit Low Voltage

Quick Answer

The diagnostic trouble code P205C indicates a problem with the reductant tank temperature sensor circuit, specifically that the voltage is lower than expected. Common causes include Faulty reductant tank temperature sensor, Wiring or connector issues in the sensor circuit, Corrosion or contamination in the sensor or wiring. 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
P205C indicates Reductant Tank Temperature Sensor Circuit Low Voltage.
Common causes
Common causes include Faulty reductant tank temperature sensor, Wiring or connector issues in the sensor circuit, Corrosion or contamination in the sensor or wiring.
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 10, 2024
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Code P205C Description

The diagnostic trouble code P205C indicates a problem with the reductant tank temperature sensor circuit, specifically that the voltage is lower than expected. The reductant tank temperature sensor is a critical component of the Selective Catalytic Reduction (SCR) system, which helps reduce harmful emissions in diesel engines. This sensor measures the temperature of the diesel exhaust fluid (DEF) in the reductant tank and sends this information to the engine control module (ECM) to ensure proper operation of the SCR system.

OBDII Code P205C - Reductant Tank Temperature Sensor Circuit Low Voltage
P205C Code - Reductant Tank Temperature Sensor Circuit Low Voltage

Common Causes of P205C

  1. Faulty reductant tank temperature sensor
  2. Wiring or connector issues in the sensor circuit
  3. Corrosion or contamination in the sensor or wiring
  4. ECM software or hardware issues
  5. DEF quality or contamination issues

Symptoms of P205C

  1. Check Engine Light illuminated
  2. Reduced engine power
  3. Poor fuel efficiency
  4. Increased emissions
  5. DEF level warning light may be activated

How to Fix P205C

  1. Begin by performing a visual inspection of the reductant tank temperature sensor and its wiring for any signs of damage, corrosion, or contamination.
  2. Use a multimeter to test the sensor's resistance and voltage output to determine if it is functioning properly.
  3. If the sensor is faulty, replace it with a new OEM sensor to ensure correct operation.
  4. Check and repair any damaged wiring or connectors in the sensor circuit.
  5. Clear the diagnostic trouble codes from the ECM and perform a test drive to verify that the issue has been resolved.

Cost to Fix P205C

The cost of repairing a P205C code can vary depending on the specific cause of the issue and the vehicle's make and model. In general, the cost of parts for a new reductant tank temperature sensor can range from $50 to $200, while labor costs can add another $100 to $200. Overall, the total repair cost for this issue is typically between $150 and $400. It's important to note that these are rough estimates, and actual costs may vary based on the factors mentioned earlier.

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Code P205C 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.

Frequently Asked Questions about P205C Code

1. What are the common symptoms of OBDII code P205C (Reductant Tank Temperature Sensor Circuit Low Voltage)?

- Common symptoms include poor engine performance, decreased fuel efficiency, and the illumination of the check engine light.

2. What are the possible causes of OBDII code P205C?

- The code P205C can be caused by a faulty reductant tank temperature sensor, damaged wiring or connectors in the sensor circuit, or issues with the powertrain control module (PCM).

3. How can I diagnose the cause of OBDII code P205C?

- Diagnose the code by checking the reductant tank temperature sensor for proper operation, inspecting the sensor wiring and connectors for damage, and using an OBDII scanner to gather more information about the issue.

4. Can I continue driving my vehicle with OBDII code P205C?

- It is not recommended to continue driving with the code P205C, as it can lead to further damage to the vehicle's emissions system and may cause decreased performance and fuel efficiency.

5. How can I repair OBDII code P205C?

- Repair options include replacing the faulty reductant tank temperature sensor, repairing any damaged wiring or connectors in the sensor circuit, and resetting the code using an OBDII scanner.

6. Will OBDII code P205C cause my vehicle to fail an emissions test?

- Yes, OBDII code P205C can cause your vehicle to fail an emissions test due to the malfunction in the reductant tank temperature sensor circuit.

7. Is it safe to ignore OBDII code P205C and not address the issue?

- Ignoring OBDII code P205C can lead to more severe issues with your vehicle's emissions system and may result in decreased performance and fuel efficiency. It is recommended to address the problem promptly.

8. Can extreme weather conditions affect the occurrence of OBDII code P205C?

- Yes, extreme hot or cold weather conditions can sometimes affect the performance of the reductant tank temperature sensor and contribute to triggering code P205C.

9. How long does it typically take to repair OBDII code P205C?

- The repair time for OBDII code P205C can vary depending on the exact cause of the issue, but it generally takes a few hours to diagnose and fix the problem.

10. Can a DIY enthusiast repair OBDII code P205C, or is professional help recommended?

- While some individuals with automotive repair experience may be able to address OBDII code P205C on their own, it is often recommended to seek professional help to ensure the issue is properly diagnosed and repaired.

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