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P20C0 2017 Chevrolet Silverado Code - Reductant Heater 2 Control Circuit High Voltage

Quick Answer

The P20C0 diagnostic trouble code (DTC) specifically pertains to the Reductant Heater 2 Control Circuit High Voltage in a 2017 Chevrolet Silverado. Common causes include Faulty Reductant Heater: The reductant heater itself may be malfunctioning, causing the high voltage condition in the circuit, Wiring Issues: Damaged or corroded wiring in the reductant heater control circuit can lead to high voltage readings, ECM Malfunction: A malfunctioning engine control module (ECM) can also cause the control circuit to register high voltage. 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
P20C0 2017 Chevrolet Silverado indicates Reductant Heater 2 Control Circuit High Voltage.
Common causes
Common causes include Faulty Reductant Heater: The reductant heater itself may be malfunctioning, causing the high voltage condition in the circuit, Wiring Issues: Damaged or corroded wiring in the reductant heater control circuit can lead to high voltage readings, ECM Malfunction: A malfunctioning engine control module (ECM) can also cause the control circuit to register high voltage.
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 11, 2024
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Code P20C0 2017 Chevrolet Silverado Description

The P20C0 diagnostic trouble code (DTC) specifically pertains to the Reductant Heater 2 Control Circuit High Voltage in a 2017 Chevrolet Silverado. This code indicates that there is a potential issue with the reductant heater system in the vehicle. The reductant heater is a component of the Selective Catalytic Reduction (SCR) system, which is responsible for reducing harmful emissions such as nitrogen oxides (NOx) in diesel engines.

OBDII Code P20C0 2017 Chevrolet Silverado - Reductant Heater 2 Control Circuit High Voltage
P20C0 2017 Chevrolet Silverado Code - Reductant Heater 2 Control Circuit High Voltage

Common Causes of P20C0 2017 Chevrolet Silverado

  1. Faulty Reductant Heater: The reductant heater itself may be malfunctioning, causing the high voltage condition in the circuit.
  2. Wiring Issues: Damaged or corroded wiring in the reductant heater control circuit can lead to high voltage readings.
  3. ECM Malfunction: A malfunctioning engine control module (ECM) can also cause the control circuit to register high voltage.
  4. Blown Fuse: A blown fuse in the reductant heater circuit can disrupt the voltage levels and trigger this code.
  5. Sensor Malfunction: A faulty sensor that monitors the reductant heater system may also contribute to this issue.

Symptoms of P20C0 2017 Chevrolet Silverado

  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 Fuel Efficiency: A malfunctioning reductant heater can lead to decreased fuel efficiency as the engine may not be operating at its optimal performance level.
  3. Decreased Power Output: The vehicle may experience a reduction in power output, especially during acceleration.
  4. Increased Emissions: The vehicle may produce higher emissions than usual due to the malfunctioning reductant heater.
  5. Strange Smells: In some cases, a malfunctioning reductant heater may produce unusual smells, such as sulfur or ammonia odors, from the exhaust.

How to Fix P20C0 2017 Chevrolet Silverado

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the DTC and perform a thorough inspection of the reductant heater system to identify the root cause of the high voltage condition.
  2. Check Wiring and Connections: Inspect the wiring harness and connections in the reductant heater circuit for any damage, corrosion, or loose connections. Repair or replace any faulty components as needed.
  3. Test Reductant Heater and Sensors: Test the reductant heater unit and sensors to ensure they are functioning correctly. Replace any faulty components.
  4. Reset the Check Engine Light: After repairing the issue, clear the DTC and reset the check engine light using a diagnostic scanner.
  5. Test Drive: Take the vehicle for a test drive to ensure that the repair has resolved the issue and that the check engine light does not reappear.

Cost to Fix P20C0 2017 Chevrolet Silverado

The typical repair costs for addressing a P20C0 code in a 2017 Chevrolet Silverado can range from $200 to $500, depending on the extent of the issue and the cost of parts and labor. This estimate includes the cost of diagnosing the problem, replacing any faulty components, and resetting the check engine light. However, it's important to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It is advisable to check local rates for a more accurate estimate before proceeding with the repair.

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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 P20C0 2017 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P20C0 in a 2017 Chevrolet Silverado?

The common symptoms of OBDII code P20C0 in a 2017 Chevrolet Silverado include the check engine light coming on, reduced engine power, and potential issues with the vehicle's emissions system.

2. What does the OBDII code P20C0 "Reductant Heater 2 Control Circuit High Voltage" mean in a 2017 Chevrolet Silverado?

The OBDII code P20C0 indicates a problem with the reductant heater 2 control circuit in the emissions system of a 2017 Chevrolet Silverado, specifically detecting high voltage in this circuit.

3. What are the possible causes of OBDII code P20C0 in a 2017 Chevrolet Silverado?

Possible causes of OBDII code P20C0 in a 2017 Chevrolet Silverado include a faulty reductant heater, damaged wiring or connectors in the control circuit, a malfunctioning powertrain control module, or issues with the reductant system components.

4. How serious is OBDII code P20C0 in a 2017 Chevrolet Silverado?

OBDII code P20C0 in a 2017 Chevrolet Silverado should be addressed promptly as it can lead to reduced engine performance, increased emissions, and potential damage to the vehicle's emissions system if left unresolved.

5. Can I continue driving my 2017 Chevrolet Silverado with OBDII code P20C0 present?

It is not recommended to continue driving your 2017 Chevrolet Silverado with OBDII code P20C0 present, as it can lead to further damage to the emissions system and potentially affect the vehicle's performance.

6. How can I diagnose and repair OBDII code P20C0 in my 2017 Chevrolet Silverado?

Diagnosing and repairing OBDII code P20C0 in a 2017 Chevrolet Silverado typically involves using a diagnostic scanner to pinpoint the issue, checking the reductant heater and its circuit for faults, repairing or replacing damaged components, and clearing the code.

7. Is it possible to clear OBDII code P20C0 in a 2017 Chevrolet Silverado without fixing the issue?

Clearing OBDII code P20C0 without addressing the underlying problem is not recommended, as the issue causing the code will persist and may lead to further complications down the line.

8. How much does it cost to repair OBDII code P20C0 in a 2017 Chevrolet Silverado?

The cost to repair OBDII code P20C0 in a 2017 Chevrolet Silverado can vary depending on the specific cause of the issue, but it may involve expenses for parts replacement, labor, and diagnostic services.

9. Can a DIY enthusiast fix OBDII code P20C0 in a 2017 Chevrolet Silverado?

While some DIY enthusiasts with experience in automotive repair may be able to diagnose and fix OBDII code P20C0 in a 2017 Chevrolet Silverado, it is recommended to consult a professional mechanic for accurate diagnosis and proper repair.

10. How can I prevent OBDII code P20C0 from occurring in my 2017 Chevrolet Silverado?

To prevent OBDII code P20C0 in a 2017 Chevrolet Silverado, it is essential to perform regular maintenance on the vehicle's emissions system, address any warning signs promptly, and avoid driving with known issues that could affect the reductant heater circuit.

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