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P20BD 2015 GMC Sierra Code - Reductant Heater 2 Control Circuit

Quick Answer

The P20BD diagnostic trouble code (DTC) for a 2015 GMC Sierra relates to the Reductant Heater 2 Control Circuit. Common causes include Faulty reductant heater 2, Wiring issues or electrical connections related to the control circuit, Defective SCR system components. 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
P20BD 2015 GMC Sierra indicates Reductant Heater 2 Control Circuit.
Common causes
Common causes include Faulty reductant heater 2, Wiring issues or electrical connections related to the control circuit, Defective SCR system components.
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 12, 2024
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Code P20BD 2015 GMC Sierra Description

The P20BD diagnostic trouble code (DTC) for a 2015 GMC Sierra relates to the Reductant Heater 2 Control Circuit. This code specifically indicates that there is a malfunction in the control circuit for the reductant heater 2, which is a component of the Selective Catalytic Reduction (SCR) system. The SCR system is responsible for reducing harmful emissions by injecting a urea-based solution (diesel exhaust fluid) into the exhaust stream to convert nitrogen oxides into harmless nitrogen and water vapor.

OBDII Code P20BD 2015 GMC Sierra - Reductant Heater 2 Control Circuit
P20BD 2015 GMC Sierra Code - Reductant Heater 2 Control Circuit

Common Causes of P20BD 2015 GMC Sierra

  1. Faulty reductant heater 2
  2. Wiring issues or electrical connections related to the control circuit
  3. Defective SCR system components
  4. Software issues or calibration errors
  5. Environmental factors such as extreme temperatures affecting the reductant heater

Symptoms of P20BD 2015 GMC Sierra

  1. Check engine light illuminated on the dashboard
  2. Reduced power mode activated
  3. Increased fuel consumption
  4. Failed emissions test
  5. Rough idling or hesitation during acceleration

How to Fix P20BD 2015 GMC Sierra

  1. Diagnose the specific cause of the P20BD code using a diagnostic scanner to pinpoint the issue with the reductant heater 2 control circuit.
  2. Inspect the wiring and electrical connections related to the reductant heater 2 for any signs of damage or corrosion. Repair or replace as necessary.
  3. Test the reductant heater 2 to ensure it is functioning correctly. Replace if found to be faulty.
  4. Clear the DTC and reset the check engine light using the diagnostic scanner.
  5. Perform a test drive to verify that the issue has been resolved and that the vehicle is operating normally.

Cost to Fix P20BD 2015 GMC Sierra

The typical repair costs for addressing a P20BD code on a 2015 GMC Sierra can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. In general, the cost of parts for replacing a faulty reductant heater 2 or repairing wiring issues can range from $200 to $500. Labor costs can add an additional $100 to $300, with total repair costs typically falling between $300 and $800.

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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 P20BD 2015 GMC Sierra Code

1. What does OBDII code P20BD for Reductant Heater 2 Control Circuit in a 2015 GMC Sierra indicate?

This code indicates a malfunction in the control circuit of the Reductant Heater 2 system in the vehicle's emissions control system.

2. What are some common symptoms of OBDII code P20BD in a 2015 GMC Sierra?

Common symptoms include the illumination of the Check Engine Light, reduced engine performance, and potential failure to pass emission tests.

3. What are the possible causes of OBDII code P20BD in a 2015 GMC Sierra?

Potential causes include a faulty Reductant Heater 2, damaged wiring or connectors in the control circuit, a blown fuse, or issues with the powertrain control module.

4. How can I diagnose the cause of OBDII code P20BD in my 2015 GMC Sierra?

Diagnosis typically involves using a diagnostic scanner to retrieve the code, checking the Reductant Heater 2 system components for faults, inspecting wiring and connectors for damage, and testing the powertrain control module.

5. What are the repair options for addressing OBDII code P20BD in a 2015 GMC Sierra?

Repairs may involve replacing the faulty Reductant Heater 2, repairing damaged wiring or connectors, replacing blown fuses, or reprogramming or replacing the powertrain control module if necessary.

6. Can I continue driving my 2015 GMC Sierra with OBDII code P20BD present?

It is not recommended to continue driving the vehicle with this code present, as it can lead to reduced engine performance and potential emission control system issues.

7. How much does it typically cost to repair OBDII code P20BD in a 2015 GMC Sierra?

The cost of repair can vary depending on the specific cause of the code, but it may range from a few hundred to over a thousand dollars, including parts and labor.

8. Are there any preventive maintenance tips to avoid OBDII code P20BD in a 2015 GMC Sierra?

Regularly servicing the vehicle, including checking the emission control system components, can help prevent issues that may trigger this code.

9. Can I reset the Check Engine Light after repairing OBDII code P20BD in my 2015 GMC Sierra?

Once the underlying issue is fixed, the Check Engine Light can be reset using a diagnostic scanner to clear the code and turn off the warning light.

10. Should I attempt to repair OBDII code P20BD in my 2015 GMC Sierra myself, or is it best left to a professional?

Due to the complexity of the emission control system and electrical components involved, it is generally recommended to have this code diagnosed and repaired by a qualified automotive technician.

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