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P20BD 2017 GMC Sierra Code - Reductant Heater 2 Control Circuit

Quick Answer

The P20BD diagnostic trouble code (DTC) for a 2017 GMC Sierra relates to the Reductant Heater 2 Control Circuit. Common causes include Wiring harness damage or corrosion, Faulty reductant heater, Connector issues. 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 2017 GMC Sierra indicates Reductant Heater 2 Control Circuit.
Common causes
Common causes include Wiring harness damage or corrosion, Faulty reductant heater, Connector issues.
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 14, 2024
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Code P20BD 2017 GMC Sierra Description

The P20BD diagnostic trouble code (DTC) for a 2017 GMC Sierra relates to the Reductant Heater 2 Control Circuit. This code indicates a problem with the control circuit for the reductant heater, which is a component of the selective catalytic reduction (SCR) system in the vehicle. The SCR system is responsible for reducing harmful emissions by injecting a urea-based solution (diesel exhaust fluid) into the exhaust stream, which reacts with nitrogen oxides to convert them into harmless nitrogen and water vapor.

OBDII Code P20BD 2017 GMC Sierra - Reductant Heater 2 Control Circuit
P20BD 2017 GMC Sierra Code - Reductant Heater 2 Control Circuit

Common Causes of P20BD 2017 GMC Sierra

  1. Wiring harness damage or corrosion
  2. Faulty reductant heater
  3. Connector issues
  4. PCM malfunction
  5. Electrical system faults

Symptoms of P20BD 2017 GMC Sierra

  1. Check engine light illuminated
  2. Decreased fuel efficiency
  3. Failed emissions test
  4. Reduced engine performance
  5. Rough idling or stalling

How to Fix P20BD 2017 GMC Sierra

  1. Begin by conducting a thorough inspection of the wiring harness, connectors, and reductant heater for any visible damage or corrosion.
  2. Test the reductant heater for proper functionality using a multimeter to check for continuity and resistance.
  3. Inspect and clean any corroded connectors, ensuring a secure connection.
  4. If the reductant heater is faulty, replace it with a new unit following manufacturer guidelines.
  5. Clear the DTC and reset the check engine light using a diagnostic scan tool to ensure the repair was successful.

Cost to Fix P20BD 2017 GMC Sierra

The cost of repairing a P20BD DTC related to the Reductant Heater 2 Control Circuit can vary depending on the specific cause of the issue and the cost of parts and labor. In general, the cost of replacing a faulty reductant heater can range from $200 to $500, including parts and labor. Additional costs may apply if wiring harnesses or connectors need to be replaced. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate.

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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 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code P20BD in a 2017 GMC Sierra related to the Reductant Heater 2 Control Circuit?

The common symptoms include the check engine light illuminating on the dashboard, reduced engine performance, and potential issues with emissions control.

2. What are the possible causes of OBDII code P20BD in a 2017 GMC Sierra?

Potential causes of this code may include a faulty reductant heater 2, damaged wiring or connectors in the control circuit, or issues with the powertrain control module (PCM).

3. How can I diagnose OBDII code P20BD in my 2017 GMC Sierra?

Diagnosing this code typically involves using an OBDII scanner to retrieve the specific fault code, conducting a visual inspection of the reductant heater 2 components, and testing the related wiring and connectors for continuity and proper voltage.

4. Can I continue driving my 2017 GMC Sierra with OBDII code P20BD related to the Reductant Heater 2 Control Circuit?

It is not recommended to continue driving the vehicle with this fault code present, as it can lead to further damage to the emissions control system and potentially affect the vehicle's performance.

5. How can I repair OBDII code P20BD in my 2017 GMC Sierra?

Repairing this code may involve replacing the faulty reductant heater 2, repairing or replacing damaged wiring or connectors, or resetting the PCM after addressing the underlying issue.

6. Is it possible to clear OBDII code P20BD in a 2017 GMC Sierra without fixing the underlying issue?

While you can clear the fault code with an OBDII scanner, it is not recommended to do so without addressing the root cause, as the issue may persist and trigger the code again in the future.

7. How much does it typically cost to repair OBDII code P20BD in a 2017 GMC Sierra at a dealership or a mechanic?

The cost of repairing this code can vary depending on the extent of the issue and the labor rates of the service provider. It is advisable to get a diagnosis and estimate from a professional technician.

8. Are there any preventive maintenance tips to avoid OBDII code P20BD in a 2017 GMC Sierra?

Regularly servicing the vehicle, including following the manufacturer's recommended maintenance schedule, can help prevent issues like OBDII code P20BD related to the Reductant Heater 2 Control Circuit.

9. Can a DIY enthusiast fix OBDII code P20BD in a 2017 GMC Sierra at home?

While some aspects of diagnosing and repairing this code may be possible for DIY enthusiasts with the right tools and knowledge, it is recommended to consult a professional technician for proper diagnosis and repair to ensure safety and accuracy.

10. Will OBDII code P20BD in a 2017 GMC Sierra cause the vehicle to fail an emissions test?

Yes, this fault code related to the Reductant Heater 2 Control Circuit can affect emissions control, potentially causing the vehicle to fail an emissions test. It is important to address the issue promptly to ensure compliance with regulations.

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