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P205C Audi Code - Reductant Tank Temperature Sensor Circuit Low

Quick Answer

The P205C diagnostic trouble code (DTC) for Audi vehicles refers to the Reductant Tank Temperature Sensor Circuit Low. Common causes include Faulty Sensor: The most common cause of the P205C code is a malfunctioning reductant tank temperature sensor, Wiring Issues: Corrosion, damaged wires, or poor connections in the sensor circuit can also trigger this code, Defective ECM: A problem with the Engine Control Module (ECM) that processes the sensor's signal could be another possible cause. 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 Audi indicates Reductant Tank Temperature Sensor Circuit Low.
Common causes
Common causes include Faulty Sensor: The most common cause of the P205C code is a malfunctioning reductant tank temperature sensor, Wiring Issues: Corrosion, damaged wires, or poor connections in the sensor circuit can also trigger this code, Defective ECM: A problem with the Engine Control Module (ECM) that processes the sensor's signal could be another possible cause.
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 07, 2024
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Code P205C Audi Description

The P205C diagnostic trouble code (DTC) for Audi vehicles refers to the Reductant Tank Temperature Sensor Circuit Low. In modern diesel vehicles, a reductant tank is used to store a liquid called Diesel Exhaust Fluid (DEF), which is injected into the exhaust system to reduce harmful emissions. The reductant tank temperature sensor is a crucial component that monitors the temperature of the DEF in the tank. This sensor ensures that the DEF remains at the correct temperature for optimal performance.

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

Common Causes of P205C Audi

  1. Faulty Sensor: The most common cause of the P205C code is a malfunctioning reductant tank temperature sensor.
  2. Wiring Issues: Corrosion, damaged wires, or poor connections in the sensor circuit can also trigger this code.
  3. Defective ECM: A problem with the Engine Control Module (ECM) that processes the sensor's signal could be another possible cause.
  4. Low DEF Level: If the DEF level in the reductant tank is low, it may affect the sensor's readings and trigger the code.

Symptoms of P205C Audi

  1. Check Engine Light: The most common symptom of the P205C code is the illumination of the Check Engine Light on the dashboard.
  2. Poor Fuel Economy: Incorrect DEF dosing due to a faulty reductant tank temperature sensor can lead to decreased fuel efficiency.
  3. Reduced Engine Performance: In some cases, the vehicle may experience a decrease in engine performance or responsiveness.
  4. Failed Emissions Test: If the issue is not addressed, it may cause the vehicle to fail emissions testing.

How to Fix P205C Audi

  1. Diagnose the Issue: Use a diagnostic scan tool to read the codes and perform testing to verify the fault in the reductant tank temperature sensor circuit.
  2. Replace the Sensor: If the sensor is found to be faulty, it will need to be replaced with a new one.
  3. Check Wiring: Inspect the wiring harness for any damage or corrosion and repair or replace as necessary.
  4. Reset the Codes: After completing the repairs, reset the codes and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P205C Audi

The cost of repairing the P205C code on an Audi vehicle can vary depending on the specific model and year. In general, the price for replacing a reductant tank temperature sensor ranges from $150 to $300, including both parts and labor. Additional costs may apply if wiring repairs or ECM replacement are required. It is recommended to consult with a professional mechanic or dealership for an accurate cost estimate based on the vehicle's make and model. Keep in mind that labor rates can vary, so it's advisable to inquire about rates in your area before proceeding with the repair.

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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 Audi Code

1. What does the OBDII code P205C mean on an Audi?

P205C indicates that the reductant (DEF/AdBlue) tank temperature sensor circuit is reading a low signal, which could affect the vehicle's emissions system.

2. What are the common symptoms of the P205C code in an Audi?

Symptoms may include a check engine light, DEF system warning messages, reduced engine performance, or issues with emissions system functionality.

3. What causes the P205C code to appear in an Audi?

Possible causes include a faulty reductant tank temperature sensor, damaged wiring or connectors, a malfunctioning DEF control module, or an empty DEF tank.

4. Can driving with a P205C code damage my Audi?

While driving with this code won't immediately damage your vehicle, prolonged neglect may lead to reduced engine performance or emissions non-compliance.

5. How do I diagnose the P205C code on my Audi?

Start by checking the wiring and connectors for the reductant temperature sensor. Use a scan tool to monitor sensor readings and test for continuity in the circuit.

6. How is the P205C code repaired on an Audi?

Repairs may involve replacing the reductant tank temperature sensor, repairing damaged wiring, or updating/reprogramming the DEF control module.

7. Can an empty DEF tank cause the P205C code?

Yes, if the DEF tank is empty or the system detects insufficient fluid, it can trigger related codes, though P205C specifically points to a temperature sensor issue.

8. How much does it cost to fix the P205C code on an Audi?

Repair costs can vary but typically range from $100 to $400, depending on whether the sensor, wiring, or control module needs repair or replacement.

9. Is it safe to clear the P205C code without fixing the issue?

Clearing the code without addressing the root cause may temporarily turn off the check engine light, but the issue will likely reoccur and could lead to further problems.

10. Can a software update fix the P205C code on an Audi?

In some cases, a software update for the DEF system control module may resolve sensor communication issues, but further diagnosis is necessary to confirm.

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