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P205C Chevrolet Code - Reductant Tank Temperature Sensor Circuit Low Voltage

Quick Answer

The P205C diagnostic trouble code (DTC) for Chevrolet vehicles refers to an issue with the reductant tank temperature sensor circuit registering low voltage. Common causes include Faulty Sensor: The reductant tank temperature sensor itself may be faulty, sending incorrect voltage signals to the ECM, Wiring Issues: Problems with the wiring harness connecting the sensor to the ECM can cause low voltage readings, Corrosion: Corrosion on the sensor or wiring connections can disrupt the voltage signal and trigger this 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
P205C Chevrolet indicates Reductant Tank Temperature Sensor Circuit Low Voltage.
Common causes
Common causes include Faulty Sensor: The reductant tank temperature sensor itself may be faulty, sending incorrect voltage signals to the ECM, Wiring Issues: Problems with the wiring harness connecting the sensor to the ECM can cause low voltage readings, Corrosion: Corrosion on the sensor or wiring connections can disrupt the voltage signal and trigger this 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 09, 2024
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Code P205C Chevrolet Description

The P205C diagnostic trouble code (DTC) for Chevrolet vehicles refers to an issue with the reductant tank temperature sensor circuit registering low voltage. The reductant tank temperature sensor is a crucial component of the Selective Catalytic Reduction (SCR) system, which helps reduce harmful emissions in diesel engines. This sensor is responsible for monitoring the temperature of the reductant fluid (such as Diesel Exhaust Fluid or DEF) in the reductant tank. When the sensor detects a low voltage signal, it indicates that there may be a problem with the sensor itself, the wiring, or the reductant tank temperature.

OBDII Code P205C Chevrolet - Reductant Tank Temperature Sensor Circuit Low Voltage
P205C Chevrolet Code - Reductant Tank Temperature Sensor Circuit Low Voltage

Common Causes of P205C Chevrolet

  1. Faulty Sensor: The reductant tank temperature sensor itself may be faulty, sending incorrect voltage signals to the ECM.
  2. Wiring Issues: Problems with the wiring harness connecting the sensor to the ECM can cause low voltage readings.
  3. Corrosion: Corrosion on the sensor or wiring connections can disrupt the voltage signal and trigger this code.
  4. Defective ECM: In rare cases, a malfunctioning ECM can misinterpret the voltage signal from the sensor, leading to this code.

Symptoms of P205C Chevrolet

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the vehicle's dashboard.
  2. Reduced Power: The vehicle may go into a reduced power mode, limiting acceleration and overall performance.
  3. Poor Fuel Efficiency: A malfunctioning reductant tank temperature sensor can lead to decreased fuel efficiency due to improper operation of the SCR system.
  4. Failed Emissions Test: If the SCR system is not functioning properly, the vehicle may fail an emissions test due to increased emissions.

How to Fix P205C Chevrolet

  1. Diagnostic Scan: Begin by using a diagnostic scan tool to retrieve the specific trouble code and verify the issue with the reductant tank temperature sensor.
  2. Sensor Replacement: If the sensor is faulty, replace it with a new OEM or high-quality aftermarket sensor. Ensure proper installation and calibration.
  3. Check Wiring: Inspect the wiring harness for any damage, corrosion, or loose connections. Repair or replace any damaged wires as needed.
  4. Clear Codes: After completing the repair, clear the diagnostic trouble codes from the ECM memory to reset the system.
  5. Test Drive: Take the vehicle for a test drive to ensure that the check engine light does not reappear and that the vehicle's performance is restored.

Cost to Fix P205C Chevrolet

The cost of repairing a P205C code for a Chevrolet vehicle can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. On average, the cost of replacing a reductant tank temperature sensor can range from $150 to $300, including parts and labor. Wiring repairs or ECM replacement may incur additional costs. It's important to consult with a qualified mechanic or dealership to get an accurate estimate based on your vehicle's make and model. Keep in mind that labor rates can vary between different regions and service providers.

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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 Chevrolet Code

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

P205C indicates a low voltage issue in the reductant tank temperature sensor circuit, which monitors the temperature of the Diesel Exhaust Fluid (DEF) in the tank.

2. What are the symptoms of code P205C on a Chevrolet?

Symptoms may include a Check Engine Light, DEF system warning messages, reduced engine performance, and potential issues with the vehicle's emissions system.

3. What causes the P205C code on a Chevrolet?

Common causes include a faulty reductant tank temperature sensor, wiring or connector issues, low DEF levels, or a failed reductant control module.

4. Can I still drive my Chevrolet with the P205C code?

You can drive the vehicle, but it may enter reduced power mode if the DEF system malfunctions. Addressing the issue promptly is recommended to avoid further problems.

5. How do I diagnose the P205C code on a Chevrolet?

Diagnose by inspecting the reductant tank temperature sensor and its wiring for damage, checking for corrosion at connectors, and testing the sensor’s voltage output with a multimeter.

6. How do I fix the P205C code on a Chevrolet?

Repairs may involve replacing the reductant tank temperature sensor, repairing damaged wiring or connectors, and ensuring the DEF tank is filled with quality DEF fluid.

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

Repair costs can range from $100 to $500 depending on whether the issue is a sensor replacement, wiring repair, or module replacement.

8. Can a low DEF level cause the P205C code on a Chevrolet?

Low DEF levels typically won't directly cause this code but can contribute to related issues in the DEF system. Ensure the tank is adequately filled.

9. Will clearing the code fix the P205C issue on a Chevrolet?

Clearing the code temporarily removes the warning, but the root cause must be resolved to prevent the code from returning.

10. What tools are needed to fix the P205C code on a Chevrolet?

You'll need an OBDII scanner, a multimeter for voltage testing, and basic tools for inspecting and replacing components in the reductant system.

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