AutoCodes – Audi – P205C Audi

P205C Audi Code - Reductant Tank Temperature Sensor Circuit Low

Quick Answer

The Reductant Tank Temperature Sensor is a variable resistor used to measure the temperature inside the reductant tank. Common causes include Faulty Reductant Tank Temperature Sensor, Reductant Tank Temperature Sensor harness is open or shorted, Reductant Tank Temperature Sensor circuit poor electrical connection. 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 Reductant Tank Temperature Sensor, Reductant Tank Temperature Sensor harness is open or shorted, Reductant Tank Temperature Sensor circuit poor electrical connection.
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.

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Code Popularity 2,334

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 21, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P205C Audi Description

The Reductant Tank Temperature Sensor is a variable resistor used to measure the temperature inside the reductant tank. The sensor is wired to the Reductant Control Module, which acquires the sensor signal and sends it to the Engine Control Module (ECM) via serial data. The Reductant Control Module supplies 5 V to the reductant temperature sensor signal circuit and a ground for the low reference circuit. The Diagnostic Trouble Code (DTC) will be set when the difference between reductant temperature sensor signal and exhaust gas temperature sensor signals is outside a calibrated range.

OBDII Code P205C Audi - Reductant Tank Temperature Sensor Circuit Low - AutoCodes.com — P205C Audi Code - Reductant Tank Temperature Sensor Circuit Low

What does this mean?

What are the Possible Causes of the DTC P205C Audi?

Faulty Reductant Tank Temperature Sensor
Reductant Tank Temperature Sensor harness is open or shorted
Reductant Tank Temperature Sensor circuit poor electrical connection

How to Fix the DTC P205C Audi?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P205C Audi code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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.