P20BF 2018 GMC Sierra Code - Reductant Heater 2 Control Circuit Low Voltage
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
- P20BF 2018 GMC Sierra indicates Reductant Heater 2 Control Circuit Low Voltage.
- 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.
Code P20BF 2018 GMC Sierra Description
The Diagnostic Trouble Code (DTC) will be set when the ECM indicates the reductant line heater control circuit is shorted to ground or overloaded for greater than 4 s.
What are the Possible Causes of the DTC P20BF 2018 GMC Sierra?
- 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 P20BF 2018 GMC Sierra?
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 P20BF 2018 GMC Sierra 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 P20BF 2018 GMC Sierra code?
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Frequently Asked Questions about P20BF 2018 GMC Sierra Code
1. What are the common symptoms of OBDII code P20BF in a 2018 GMC Sierra related to Reductant Heater 2 Control Circuit Low Voltage?
The common symptoms include the check engine light illuminating, reduced engine power, and potential issues with the vehicle's emissions system.
2. What are the possible causes of OBDII code P20BF on a 2018 GMC Sierra indicating Reductant Heater 2 Control Circuit Low Voltage?
Possible causes include a faulty reductant heater, damaged wiring or connectors in the reductant heater circuit, a malfunctioning temperature sensor, or issues with the powertrain control module (PCM).
3. How can I diagnose the OBDII code P20BF on my 2018 GMC Sierra?
Diagnosis involves using an OBDII scanner to read the code, checking the reductant heater system for any visible damage, inspecting wiring and connectors for corrosion or breaks, and testing the temperature sensor and related components.
4. Can I continue driving my 2018 GMC Sierra with OBDII code P20BF indicating Reductant Heater 2 Control Circuit Low Voltage?
It is not recommended to continue driving the vehicle with this code, as it can lead to reduced engine performance and potential damage to the emissions system. It is best to address the issue promptly.
5. How can I repair OBDII code P20BF on my 2018 GMC Sierra related to Reductant Heater 2 Control Circuit Low Voltage?
Repair options include replacing the faulty reductant heater, repairing or replacing damaged wiring and connectors, checking and replacing the temperature sensor if needed, and resetting the code using an OBDII scanner after repairs are completed.
6. Are there any specific maintenance tips to prevent OBDII code P20BF on a 2018 GMC Sierra?
Regularly inspecting the emissions system components, ensuring proper maintenance of the reductant heater system, and addressing any warning signs promptly can help prevent issues leading to this fault code.
7. Can weather conditions affect OBDII code P20BF in a 2018 GMC Sierra related to Reductant Heater 2 Control Circuit Low Voltage?
Extreme weather conditions can potentially impact the performance of the reductant heater system, leading to issues that trigger this fault code. It is essential to keep the vehicle well maintained in all weather conditions.
8. Is OBDII code P20BF in a 2018 GMC Sierra covered under any warranty or recall?
It is advisable to check with a GMC dealership or the manufacturer to see if the issue related to this fault code is covered under any existing warranty or recall for the specific model year and vehicle.
9. Can I clear the OBDII code P20BF on my 2018 GMC Sierra without fixing the underlying issue?
While you can clear the code using an OBDII scanner, it is not recommended to do so without addressing the root cause. Ignoring the underlying problem can lead to further issues and potential damage to the vehicle in the long run.
10. How long does it typically take to repair OBDII code P20BF on a 2018 GMC Sierra?
The repair time can vary depending on the exact cause of the fault code and the complexity of the repair. It is best to consult with a mechanic or dealership for a more accurate estimate based on the specific diagnosis of the issue.
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