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Engine-Codes – Generic – P205D

P205D Code - Reductant Tank Temperature Sensor Circuit High Voltage

Quick Answer

The P205D code indicates that there is a problem with the reductant tank temperature sensor circuit in the vehicle. Common causes include Faulty Sensor: The most common cause of the P205D code is a faulty reductant tank temperature sensor that is sending incorrect readings to the vehicle's engine control module, Wiring Issues: Corrosion, damage, or loose connections in the wiring harness of the sensor circuit can also trigger this code, Software Glitch: Sometimes, a software glitch in the engine control module can cause false readings from the sensor, leading to the P205D code. 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 indicates Reductant Tank Temperature Sensor Circuit High Voltage.
Common causes
Common causes include Faulty Sensor: The most common cause of the P205D code is a faulty reductant tank temperature sensor that is sending incorrect readings to the vehicle's engine control module, Wiring Issues: Corrosion, damage, or loose connections in the wiring harness of the sensor circuit can also trigger this code, Software Glitch: Sometimes, a software glitch in the engine control module can cause false readings from the sensor, leading to the P205D code.
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 P205D Description

The P205D code indicates that there is a problem with the reductant tank temperature sensor circuit in the vehicle. The reductant tank temperature sensor is a crucial component of the vehicle's emissions system, particularly in vehicles equipped with a Selective Catalytic Reduction (SCR) system. This sensor is responsible for monitoring the temperature of the reductant fluid, which is typically a urea-based solution used in SCR systems to reduce harmful emissions.

OBDII Code P205D - Reductant Tank Temperature Sensor Circuit High Voltage
P205D Code - Reductant Tank Temperature Sensor Circuit High Voltage

Common Causes of P205D

  1. Faulty Sensor: The most common cause of the P205D code is a faulty reductant tank temperature sensor that is sending incorrect readings to the vehicle's engine control module.
  2. Wiring Issues: Corrosion, damage, or loose connections in the wiring harness of the sensor circuit can also trigger this code.
  3. Software Glitch: Sometimes, a software glitch in the engine control module can cause false readings from the sensor, leading to the P205D code.
  4. Exhaust System Leak: A leak in the exhaust system near the reductant tank temperature sensor can also cause erroneous readings and trigger this code.

Symptoms of P205D

  1. Check Engine Light: The most common symptom associated with the P205D code is the illumination of the check engine light on the vehicle's dashboard.
  2. Decreased Fuel Efficiency: A malfunctioning reductant tank temperature sensor can lead to decreased fuel efficiency as the engine may not be running at optimal levels.
  3. Engine Misfires: In some cases, a high voltage in the reductant tank temperature sensor circuit can cause engine misfires or rough idling.
  4. Failed Emissions Test: If the issue is not addressed promptly, the vehicle may fail emissions tests due to increased emissions output.

How to Fix P205D

  1. Diagnose the Issue: The first step in resolving the P205D code is to diagnose the exact cause of the problem, which may involve using a diagnostic scanner to read the code and test the sensor and its circuit.
  2. Replace the Sensor: If the reductant tank temperature sensor is found to be faulty, it will need to be replaced with a new sensor.
  3. Check Wiring: Inspect the wiring harness for any signs of damage, corrosion, or loose connections, and repair or replace as necessary.
  4. Clear the Code: Once the sensor and wiring have been checked and repaired, the code can be cleared from the vehicle's memory using a diagnostic scanner.
  5. Test Drive: After the repair is completed, it's important to test drive the vehicle to ensure that the issue has been resolved and the check engine light does not reappear.

Cost to Fix P205D

The cost of repairing a P205D code can vary depending on the make and model of the vehicle, the location of the repair shop, and the extent of the damage. In general, replacing a reductant tank temperature sensor can cost between $150 and $300, including parts and labor. However, additional costs may be incurred if wiring repairs are needed or if other components in the emissions system require attention. It's recommended to contact local repair shops for a more accurate estimate based on the specific circumstances of the vehicle. Keep in mind that diagnostic time and labor rates at auto repair shops can range from $80 to $150 per hour.

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Code P205D 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 P205D Code

1. What are the common symptoms of OBDII code P205D (Reductant Tank Temperature Sensor Circuit High Voltage)?

The common symptoms include the check engine light illuminating, decreased fuel efficiency, and potential issues with the selective catalytic reduction (SCR) system.

2. What can cause OBDII code P205D to trigger?

This code is typically triggered by a fault in the reductant tank temperature sensor circuit, such as a high voltage reading from the sensor.

3. How serious is OBDII code P205D (Reductant Tank Temperature Sensor Circuit High Voltage)?

While the vehicle may still be drivable with this code, it is important to address it promptly to avoid potential damage to the SCR system and ensure proper emissions control.

4. How can I diagnose the issue causing OBDII code P205D?

Diagnosing this code may involve checking the reductant tank temperature sensor, inspecting the wiring and connectors in the sensor circuit, and using a scan tool to gather data.

5. What are some possible repair tips for OBDII code P205D?

Repair tips may include replacing the reductant tank temperature sensor, repairing any damaged wiring or connectors, and clearing the code to see if it reoccurs.

6. Can I drive my vehicle with OBDII code P205D?

It is generally not recommended to drive the vehicle for an extended period with this code present, as it may lead to increased emissions and potential issues with the SCR system.

7. How much does it typically cost to repair OBDII code P205D?

The cost of repairing this code can vary depending on the cause of the issue, but it may involve replacing the reductant tank temperature sensor or repairing the sensor circuit.

8. Will OBDII code P205D cause my vehicle to fail emissions testing?

Yes, if this code is present during emissions testing, it is likely to cause the vehicle to fail due to increased emissions and potential issues with the SCR system.

9. Can a DIY enthusiast fix OBDII code P205D at home?

Depending on the cause of the code, some DIY enthusiasts may be able to address it at home by replacing the sensor or repairing the circuit, but professional diagnosis may be needed in some cases.

10. How often does OBDII code P205D occur in vehicles?

This code is relatively uncommon compared to other OBDII codes, but it can still occur in vehicles equipped with a reductant tank temperature sensor and SCR system.

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