AutoCodes – Chevrolet – P20B9 2015 Chevrolet Silverado

P20B9 2015 Chevrolet Silverado Code - Reductant Heater 1 Control Circuit

Quick Answer

As reductant will freeze at temperatures below -11°C (12°F), there are 2 reductant heaters located in the reductant tank. Common causes include Faulty Reductant Heater, Reductant Heater harness is open or shorted, Reductant Heater circuit poor electrical connection. 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: P20B9 2015 Chevrolet Silverado indicates Reductant Heater 1 Control Circuit.
Common causes: Common causes include Faulty Reductant Heater, Reductant Heater harness is open or shorted, Reductant Heater circuit poor electrical connection.
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.

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Code Popularity 345

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 29, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P20B9 2015 Chevrolet Silverado Description

As reductant will freeze at temperatures below -11°C (12°F), there are 2 reductant heaters located in the reductant tank. One heats the reductant in the tank, and one heats the reductant supplied to the reductant injector supply pipe. The Engine Control Module (ECM) monitors the reductant temperature in the tank in order to determine if the reductant temperature is below its freeze point. If the ECM determines that the reductant may be frozen, it activates a "defrost strategy" energizing the reductant eater. This energizing action terminates when the temperature sensor measures a threshold value over which the heater must be deactivated.
The Diagnostic Trouble Code (DTC) will be set when the ECM indicates the reductant tank heater control circuit is open for greater than 4 s.

OBDII Code P20B9 2015 Chevrolet Silverado - Reductant Heater 1 Control Circuit - AutoCodes.com — P20B9 2015 Chevrolet Silverado Code - Reductant Heater 1 Control Circuit

What does this mean?

What are the Possible Causes of the DTC P20B9 2015 Chevrolet Silverado?

Faulty Reductant Heater
Reductant Heater harness is open or shorted
Reductant Heater circuit poor electrical connection
Faulty Reductant Pump and Sensor Assembly
Faulty Reductant Control Module

How to Fix the DTC P20B9 2015 Chevrolet Silverado?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P20B9 2015 Chevrolet Silverado code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P20B9 2015 Chevrolet Silverado code?

Need more information on how to fix the P20B9 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P20B9 2015 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

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 P20B9 2015 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P20B9 in a 2015 Chevrolet Silverado?

The common symptoms of OBDII code P20B9 in a 2015 Chevrolet Silverado may include the check engine light illuminating on the dashboard and reduced engine performance.

2. What does OBDII code P20B9 indicate in a 2015 Chevrolet Silverado?

OBDII code P20B9 in a 2015 Chevrolet Silverado indicates a problem with the Reductant Heater 1 Control Circuit.

3. What are the possible causes of OBDII code P20B9 in a 2015 Chevrolet Silverado?

Common causes of OBDII code P20B9 in a 2015 Chevrolet Silverado include a faulty reductant heater, wiring issues, or a malfunctioning control module.

4. How can I diagnose OBDII code P20B9 in my 2015 Chevrolet Silverado?

Diagnosing OBDII code P20B9 in a 2015 Chevrolet Silverado typically involves using a scan tool to retrieve the code, inspecting the reductant heater system components, and testing the related circuits for continuity.

5. Can I continue driving my 2015 Chevrolet Silverado with OBDII code P20B9?

It is not recommended to drive your 2015 Chevrolet Silverado with OBDII code P20B9 as it can lead to reduced fuel efficiency and potential damage to the vehicle's emissions system.

6. How can I repair OBDII code P20B9 in my 2015 Chevrolet Silverado?

Repairing OBDII code P20B9 in a 2015 Chevrolet Silverado may involve replacing the faulty reductant heater, repairing any damaged wiring, or reprogramming the control module.

7. Is it possible to reset OBDII code P20B9 in a 2015 Chevrolet Silverado without fixing the underlying issue?

While you can clear the code with a scan tool, it will likely reappear if the underlying issue causing OBDII code P20B9 in a 2015 Chevrolet Silverado is not addressed.

8. How much does it cost to repair OBDII code P20B9 in a 2015 Chevrolet Silverado?

The cost to repair OBDII code P20B9 in a 2015 Chevrolet Silverado can vary depending on the specific issue, parts needed, and labor rates. It is recommended to consult a professional mechanic for an accurate estimate.

9. Can a DIY enthusiast fix OBDII code P20B9 in a 2015 Chevrolet Silverado?

While some DIY enthusiasts may have the skills to diagnose and repair OBDII code P20B9 in a 2015 Chevrolet Silverado, it is recommended to consult a professional mechanic for complex electrical issues like this.

10. How often does OBDII code P20B9 occur in a 2015 Chevrolet Silverado?

OBDII code P20B9 can occur in a 2015 Chevrolet Silverado due to various factors, including the age and condition of the vehicle, maintenance history, and driving habits.