AutoCodes – Volkswagen – P205C Volkswagen

P205C Volkswagen 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 Volkswagen 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 13,208

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

What does this mean?

What are the Possible Causes of the DTC P205C Volkswagen?

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 Volkswagen?

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 Volkswagen 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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Need more information on how to fix the P205C Volkswagen code? Get Access to Factory Service Manuals

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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 Volkswagen Code

1. What does the OBDII code P205C mean on a Volkswagen?

P205C indicates a "Reductant Tank Temperature Sensor Circuit Low," meaning the sensor that monitors the temperature of the DEF (Diesel Exhaust Fluid) tank is reporting a low voltage signal to the engine control module.

2. What are the common symptoms of a P205C code in a Volkswagen?

Symptoms may include a lit check engine light, DEF system warnings, reduced engine performance, or the vehicle entering limp mode.

3. What causes the P205C code to appear on a Volkswagen?

Possible causes include a faulty reductant tank temperature sensor, damaged or corroded wiring, loose electrical connections, or a malfunctioning DEF control module.

4. Can I drive my Volkswagen with a P205C code?

Driving with this code may result in reduced engine performance or the DEF system not functioning properly, potentially leading to emissions non-compliance. Itâ€™s best to address the issue promptly.

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

Start by checking the sensor and its wiring for damage or corrosion. Use a multimeter to test the sensor's voltage and resistance. If necessary, scan the system with an advanced diagnostic tool to confirm the issue.

6. How is the P205C code typically fixed?

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

7. How much does it cost to fix a P205C code on a Volkswagen?

The cost varies depending on the root cause. Replacing the sensor may cost $150-$300, while addressing wiring issues or module repairs could increase the expense.

8. Can a software update fix the P205C code?

In some cases, a software update for the DEF control module may resolve communication or calibration issues causing the code. Consult with a dealership or qualified technician.

9. What tools are needed to troubleshoot the P205C code?

Youâ€™ll need an OBDII scanner, a multimeter, and potentially the repair manual for your specific Volkswagen model to access wiring diagrams and sensor specifications.

10. Is the P205C code specific to Volkswagen vehicles?

No, this code can appear on other diesel vehicles equipped with DEF systems, but the diagnostic and repair process may vary depending on the manufacturer.