P20BF 2017 GMC Sierra Code - Reductant Heater 2 Control Circuit Low Voltage
Quick Answer
The P20BF diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates a problem with the Reductant Heater 2 Control Circuit having low voltage. Common causes include Faulty reductant heater, Wiring issues or shorts in the control circuit, Defective sensors or connectors. 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 GMC Sierra indicates Reductant Heater 2 Control Circuit Low Voltage.
- Common causes
- Common causes include Faulty reductant heater, Wiring issues or shorts in the control circuit, Defective sensors or connectors.
- 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 P20BF 2017 GMC Sierra Description
The P20BF diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates a problem with the Reductant Heater 2 Control Circuit having low voltage. In modern diesel vehicles, the reductant heater is part of the selective catalytic reduction (SCR) system, which helps reduce harmful emissions by converting nitrogen oxides into nitrogen and water vapor. The reductant heater is responsible for heating the diesel exhaust fluid (DEF) in cold temperatures to ensure it can effectively react with the harmful emissions.
Common Causes of P20BF 2017 GMC Sierra
- Faulty reductant heater
- Wiring issues or shorts in the control circuit
- Defective sensors or connectors
- Software issues with the engine control module
- Extreme temperatures affecting the operation of the reductant heater
Symptoms of P20BF 2017 GMC Sierra
- Check engine light illuminated
- Reduced fuel efficiency
- Poor engine performance
- Vehicle going into limp mode
- Failed emissions test
How to Fix P20BF 2017 GMC Sierra
- Diagnose the root cause by using a scan tool to retrieve the specific fault code and conducting a visual inspection of the reductant heater system.
- Check the wiring and connectors for any damage or corrosion and repair or replace as necessary.
- Test the reductant heater for proper operation and replace if found to be faulty.
- Clear the DTC from the vehicle's computer and road test the vehicle to ensure the issue has been resolved.
- Perform a final check to ensure the check engine light does not reappear and that the vehicle operates normally.
Cost to Fix P20BF 2017 GMC Sierra
The cost of repairing a P20BF code for a Reductant Heater 2 Control Circuit Low Voltage in a 2017 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of parts such as a new reductant heater, wiring harness, or sensors can range from $200 to $500. Labor costs at an auto repair shop typically range from $80 to $150 per hour, and the total repair time may take around 1-2 hours. Therefore, the total cost of repairing this issue could range from $280 to $800, including parts and labor. It's recommended to get quotes from local auto repair shops to get a more accurate estimate based on your location and vehicle specifics.
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Frequently Asked Questions about P20BF 2017 GMC Sierra Code
What does the OBDII code P20BF mean on a 2017 GMC Sierra?
P20BF indicates a problem with the Reductant Heater 2 Control Circuit, specifically low voltage detected by the vehicle's ECM.
What are the symptoms of code P20BF on a 2017 GMC Sierra?
Common symptoms include a check engine light, reduced exhaust system efficiency, possible warning messages related to the DEF system, and difficulty maintaining proper DEF fluid temperature.
What causes the P20BF code on a 2017 GMC Sierra?
Possible causes include a faulty reductant heater, damaged wiring or connectors in the heater circuit, a malfunctioning ECM, or low voltage due to electrical issues.
Can I drive my 2017 GMC Sierra with the P20BF code?
While the vehicle may still be drivable, prolonged driving with this code can lead to decreased DEF system performance and possible issues with emissions compliance.
How do I diagnose the P20BF code on a 2017 GMC Sierra?
Diagnosis typically involves checking the reductant heater wiring and connectors for damage, testing the heater’s resistance, and verifying proper voltage and ground signals in the circuit.
What repairs can fix the P20BF code on a 2017 GMC Sierra?
Repairs may include replacing the reductant heater, repairing damaged wiring or connectors, updating the ECM software, or replacing the ECM if necessary.
How much does it cost to repair the P20BF code on a 2017 GMC Sierra?
Repair costs vary, but replacing the reductant heater can range from $300 to $700, depending on labor rates and parts pricing.
Is a P20BF code covered under warranty for a 2017 GMC Sierra?
If your vehicle is still under emissions-related warranty, the reductant heater and associated components may be covered. Check with your dealer to confirm.
Can a P20BF code cause emissions test failure?
Yes, the P20BF code can cause your vehicle to fail an emissions test due to improper DEF system operation.
What tools are needed to troubleshoot a P20BF code on a 2017 GMC Sierra?
You’ll need an OBDII scanner, a multimeter for testing voltage and resistance, and possibly a wiring diagram for the reductant heater circuit.
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