AutoCodes – Volkswagen – P205D Volkswagen

P205D Volkswagen Code - Reductant Tank Temperature Sensor Circuit High

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: P205D Volkswagen indicates Reductant Tank Temperature Sensor Circuit High.
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 1,689

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 P205D 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 P205D Volkswagen - Reductant Tank Temperature Sensor Circuit High - AutoCodes.com — P205D Volkswagen Code - Reductant Tank Temperature Sensor Circuit High

What does this mean?

What are the Possible Causes of the DTC P205D 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 P205D 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 P205D 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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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 P205D Volkswagen Code

1. What does the OBDII code P205D mean on a Volkswagen?

The P205D code indicates a "Reductant Tank Temperature Sensor Circuit High," meaning the vehicle's ECU has detected an abnormally high voltage signal from the reductant tank temperature sensor.

2. What are the symptoms of a P205D code?

Common symptoms include the check engine light turning on, possible warnings related to the diesel exhaust fluid (DEF) system, and, in some cases, reduced engine performance or limited driving range.

3. What causes the P205D code to appear?

The most common causes include a faulty reductant tank temperature sensor, wiring issues such as damaged or corroded connections, or a malfunctioning powertrain control module (PCM).

4. Can I drive my Volkswagen with a P205D code?

While the car may still be drivable, it's not recommended as the code could lead to improper DEF system operation, potentially causing emissions issues or triggering a limp mode.

5. How do I diagnose a P205D code?

Diagnosis typically involves using an OBDII scanner to confirm the code, visually inspecting the sensor and wiring for damage, and testing the sensor's voltage and resistance with a multimeter.

6. How do you fix a P205D code on a Volkswagen?

Repair steps may include replacing the reductant tank temperature sensor, repairing damaged wiring or connectors, or, in rare cases, reprogramming or replacing the PCM.

7. What tools are needed to fix the P205D code?

You'll need an OBDII scanner, a multimeter for electrical testing, and basic hand tools to access and replace the sensor if necessary.

8. How much does it cost to repair a P205D code?

Repair costs vary but typically range from $100 to $400 depending on whether just the sensor needs replacement or if additional repairs like wiring fixes are required.

9. Can a P205D code cause emissions test failure?

Yes, the P205D code can cause your vehicle to fail an emissions test since it impacts the DEF system, which is critical for reducing nitrogen oxide emissions.

10. How can I prevent the P205D code from recurring?

Regularly maintaining the DEF system, inspecting wiring for damage, and ensuring the correct DEF fluid is used can help prevent this code from reappearing.