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P20BF 2017 Chevrolet Silverado Code - Reductant Heater 2 Control Circuit Low Voltage

Quick Answer

The P20BF diagnostic trouble code (DTC) indicates a low voltage condition in the reductant heater 2 control circuit of a 2017 Chevrolet Silverado. Common causes include Faulty Reductant Heater: The heater itself may be malfunctioning or damaged, Wiring Issues: Damaged or corroded wiring and connectors in the reductant heater circuit, ECM Malfunction: The engine control module may not be sending the correct signals to the heater. 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
P20BF 2017 Chevrolet Silverado indicates Reductant Heater 2 Control Circuit Low Voltage.
Common causes
Common causes include Faulty Reductant Heater: The heater itself may be malfunctioning or damaged, Wiring Issues: Damaged or corroded wiring and connectors in the reductant heater circuit, ECM Malfunction: The engine control module may not be sending the correct signals to the heater.
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 Oct 07, 2024
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Code P20BF 2017 Chevrolet Silverado Description

The P20BF diagnostic trouble code (DTC) indicates a low voltage condition in the reductant heater 2 control circuit of a 2017 Chevrolet Silverado. This code is part of the vehicle's emissions control system, specifically related to the selective catalytic reduction (SCR) system, which is designed to reduce nitrogen oxides (NOx) emissions. The reductant heater is responsible for warming the diesel exhaust fluid (DEF) to ensure proper atomization and injection into the exhaust stream, facilitating the SCR process.

OBDII Code P20BF 2017 Chevrolet Silverado - Reductant Heater 2 Control Circuit Low Voltage
P20BF 2017 Chevrolet Silverado Code - Reductant Heater 2 Control Circuit Low Voltage

Common Causes of P20BF 2017 Chevrolet Silverado

  1. Faulty Reductant Heater: The heater itself may be malfunctioning or damaged.
  2. Wiring Issues: Damaged or corroded wiring and connectors in the reductant heater circuit.
  3. ECM Malfunction: The engine control module may not be sending the correct signals to the heater.
  4. Low Battery Voltage: Insufficient voltage from the vehicle's battery affecting the heater's operation.
  5. Defective Relay: A malfunctioning relay that controls the power to the reductant heater.

Symptoms of P20BF 2017 Chevrolet Silverado

  1. Check Engine Light: The illumination of the check engine light on the dashboard.
  2. Poor Engine Performance: Noticeable reduction in power and acceleration, especially under load.
  3. Increased Emissions: Possible failure during emissions testing due to ineffective SCR operation.
  4. Limp Mode: The vehicle may enter a reduced power mode to prevent further damage.
  5. DEF Warning: Alerts related to low DEF quality or insufficient heating may appear.

How to Fix P20BF 2017 Chevrolet Silverado

  1. Diagnostic Scan: Use an OBD-II scanner to confirm the P20BF code and check for any additional codes.
  2. Visual Inspection: Inspect the wiring and connectors associated with the reductant heater for signs of damage or corrosion.
  3. Test the Reductant Heater: Measure the resistance of the heater to determine if it is functioning within specifications.
  4. Check Voltage Supply: Use a multimeter to check the voltage at the heater connector to ensure it is receiving adequate power.
  5. Replace Components: If any faulty components are identified (e.g., heater, wiring, relay), replace them as necessary and clear the DTC.

Cost to Fix P20BF 2017 Chevrolet Silverado

The typical repair costs for addressing the P20BF code can range from $200 to $800, depending on the specific issue identified. This estimate includes parts and labor, with parts such as a new reductant heater costing between $100 and $300. Labor costs can vary significantly based on location, vehicle make and model, and engine type. Most auto repair shops charge between $80 and $150 per hour; however, rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less. It's advisable to check local rates for a more precise estimate. A thorough diagnosis may take 1 to 2 hours, depending on the complexity of the issue.

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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 P20BF 2017 Chevrolet Silverado Code

1. What does the P20BF code mean on a 2017 Chevrolet Silverado?

The P20BF code indicates a problem with the Reductant Heater 2 Control Circuit, specifically low voltage, which can affect the operation of the diesel exhaust fluid (DEF) system.

2. What are the symptoms of the P20BF code?

Common symptoms include an illuminated check engine light, DEF system warnings on the dash, poor DEF performance, or the vehicle entering reduced power mode.

3. What causes the P20BF code to appear?

This code can be triggered by issues such as a faulty reductant heater, damaged wiring or connectors, a blown fuse, or a malfunctioning powertrain control module (PCM).

4. Can I drive my Silverado with the P20BF code?

You may be able to drive the truck temporarily, but the DEF system may stop functioning properly, potentially leading to reduced power mode or emissions compliance issues.

5. How do I diagnose the P20BF code?

Diagnosis involves checking the wiring and connectors for damage, testing the reductant heater for proper resistance, and ensuring the control circuit is receiving the correct voltage.

6. How do I fix the P20BF code?

Repairs may include replacing the reductant heater, repairing damaged wiring, replacing a blown fuse, or in rare cases, reprogramming or replacing the PCM.

7. How much does it cost to repair the P20BF code?

Repair costs vary depending on the issue but typically range from $200 to $600, with reductant heater replacement being the most common fix.

8. Is the P20BF code covered under warranty?

If your vehicle is still under the emissions warranty, the repair may be covered. Check with your dealership for details.

9. Can a bad reductant heater cause other problems?

Yes, a faulty reductant heater can prevent the DEF system from functioning, leading to increased emissions and potential engine performance issues.

10. How can I prevent the P20BF code from recurring?

Regularly inspect and maintain the DEF system, including checking wiring and connectors for damage and ensuring the system operates within the correct temperature range.

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