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P20BB 2015 Chevrolet Silverado Code - Reductant Heater 1 Control Circuit Low Voltage

Quick Answer

The P20BB diagnostic trouble code for a 2015 Chevrolet Silverado indicates a problem with the Reductant Heater 1 Control Circuit Low Voltage. Common causes include Faulty reductant heater, Wiring or connection issues, Defective reductant heater control module. 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
P20BB 2015 Chevrolet Silverado indicates Reductant Heater 1 Control Circuit Low Voltage.
Common causes
Common causes include Faulty reductant heater, Wiring or connection issues, Defective reductant heater control module.
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 Aug 19, 2024
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Code P20BB 2015 Chevrolet Silverado Description

The P20BB diagnostic trouble code for a 2015 Chevrolet Silverado indicates a problem with the Reductant Heater 1 Control Circuit Low Voltage. In vehicles equipped with a selective catalytic reduction (SCR) system, the reductant heater is responsible for warming up the diesel exhaust fluid (DEF) to optimize the efficiency of the SCR system. When the control circuit for this heater operates at a lower voltage than expected, it can lead to issues with the proper functioning of the SCR system, potentially causing increased emissions and reduced fuel efficiency.

OBDII Code P20BB 2015 Chevrolet Silverado - Reductant Heater 1 Control Circuit Low Voltage
P20BB 2015 Chevrolet Silverado Code - Reductant Heater 1 Control Circuit Low Voltage

Common Causes of P20BB 2015 Chevrolet Silverado

  1. Faulty reductant heater
  2. Wiring or connection issues
  3. Defective reductant heater control module
  4. Corrosion or damage to electrical components
  5. Software or calibration issues

Symptoms of P20BB 2015 Chevrolet Silverado

  1. Check engine light illuminated
  2. Reduced engine performance
  3. Increased fuel consumption
  4. Failed emissions test
  5. DEF freezing in cold weather

How to Fix P20BB 2015 Chevrolet Silverado

  1. Diagnose the root cause of the low voltage issue with a scan tool.
  2. Inspect the wiring and connections for any damage or corrosion.
  3. Test the reductant heater and control module for proper function.
  4. Replace any faulty components, such as the heater, control module, or wiring.
  5. Clear the trouble code and reset the system to ensure proper operation.

Cost to Fix P20BB 2015 Chevrolet Silverado

The cost of repairing a P20BB code on a 2015 Chevrolet Silverado can vary depending on the specific cause of the issue. In general, the replacement of a reductant heater or control module can range from $200 to $500, including parts and labor. Additional diagnostic fees and labor costs may apply, so it's recommended to consult with a professional mechanic for a more accurate estimate. Keep in mind that labor rates can vary between shops, so it's advisable to shop around for the best deal.

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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 P20BB 2015 Chevrolet Silverado Code

1. What are common symptoms of OBDII code P20BB in a 2015 Chevrolet Silverado?

The common symptoms of OBDII code P20BB in a 2015 Chevrolet Silverado include the check engine light coming on, reduced engine performance, and potential issues with the vehicle's emissions system.

2. What does the OBDII code P20BB indicate in a 2015 Chevrolet Silverado?

The OBDII code P20BB in a 2015 Chevrolet Silverado indicates a problem with the Reductant Heater 1 Control Circuit, specifically low voltage being detected.

3. What are possible causes of the OBDII code P20BB in a 2015 Chevrolet Silverado?

Possible causes of the OBDII code P20BB in a 2015 Chevrolet Silverado include a faulty Reductant Heater 1, damaged wiring or connectors in the control circuit, or issues with the vehicle's powertrain control module.

4. How serious is the OBDII code P20BB in a 2015 Chevrolet Silverado?

While the severity of the OBDII code P20BB may vary, it is important to address this issue promptly to ensure proper functioning of the vehicle's emissions system and to prevent potential damage to other components.

5. Can I continue driving my 2015 Chevrolet Silverado with the OBDII code P20BB present?

It is generally not recommended to continue driving your 2015 Chevrolet Silverado with the OBDII code P20BB present, as it can lead to reduced engine performance and potential emissions system problems. It is best to have the issue diagnosed and repaired as soon as possible.

6. How can I diagnose the OBDII code P20BB in my 2015 Chevrolet Silverado?

Diagnosing the OBDII code P20BB in a 2015 Chevrolet Silverado typically involves using an OBDII scanner to retrieve the code, checking the Reductant Heater 1 and its circuit for faults, and inspecting the wiring and connectors for any damage.

7. What are some repair tips for fixing the OBDII code P20BB in a 2015 Chevrolet Silverado?

Repair tips for fixing the OBDII code P20BB in a 2015 Chevrolet Silverado may include checking and replacing the Reductant Heater 1 if faulty, repairing or replacing damaged wiring or connectors, and resetting the trouble codes after repairs are completed.

8. Can I reset the OBDII code P20BB in my 2015 Chevrolet Silverado without making repairs?

While you can reset the OBDII code P20BB in your 2015 Chevrolet Silverado, it is not recommended to do so without addressing the underlying issue causing the code. Resetting the code without repairs may lead to the problem recurring.

9. How much does it cost to repair the OBDII code P20BB in a 2015 Chevrolet Silverado?

The cost to repair the OBDII code P20BB in a 2015 Chevrolet Silverado can vary depending on the specific issue causing the code, the labor rates in your area, and whether any parts need to be replaced. It is advisable to consult a mechanic for an accurate estimate.

10. Is the OBDII code P20BB covered under warranty for a 2015 Chevrolet Silverado?

Whether the OBDII code P20BB is covered under warranty for a 2015 Chevrolet Silverado depends on the vehicle's warranty status, the specific terms of the warranty, and the cause of the issue. It is recommended to check with your Chevrolet dealership or refer to your warranty documentation for more information.

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