P20BD 2016 GMC Sierra Code - Reductant Heater 2 Control Circuit
Quick Answer
The P20BD diagnostic trouble code (DTC) for a 2016 GMC Sierra relates to the Reductant Heater 2 Control Circuit. Common causes include Faulty reductant heater, Defective temperature sensor, Wiring or connection issues in the control circuit. 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
- P20BD 2016 GMC Sierra indicates Reductant Heater 2 Control Circuit.
- Common causes
- Common causes include Faulty reductant heater, Defective temperature sensor, Wiring or connection issues in the control circuit.
- 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 P20BD 2016 GMC Sierra Description
The P20BD diagnostic trouble code (DTC) for a 2016 GMC Sierra relates to the Reductant Heater 2 Control Circuit. In vehicles equipped with a selective catalytic reduction (SCR) system, the reductant heater is responsible for heating the diesel exhaust fluid (DEF) to optimize its performance in reducing harmful emissions. The Reductant Heater 2 Control Circuit code indicates a malfunction in the circuit that controls the heater for the second reductant injector.
Common Causes of P20BD 2016 GMC Sierra
- Faulty reductant heater
- Defective temperature sensor
- Wiring or connection issues in the control circuit
- Malfunctioning control module
- Corrosion or damage to components
Symptoms of P20BD 2016 GMC Sierra
- Check engine light illuminated
- Reduced fuel efficiency
- Failed emissions test
- Engine performance issues
- DEF freezing in cold weather
How to Fix P20BD 2016 GMC Sierra
- Diagnose the specific cause of the P20BD code using a scan tool and diagnostic procedures.
- Inspect the reductant heater, temperature sensor, wiring, and control module for any signs of damage or malfunction.
- Replace any faulty components, such as the heater, sensor, or control module, as needed.
- Clear the DTC and reset the vehicle's onboard computer to see if the issue has been resolved.
- Test drive the vehicle to ensure that the code does not return and that the reductant heater system is functioning properly.
Cost to Fix P20BD 2016 GMC Sierra
The cost of repairing a P20BD code on a 2016 GMC Sierra can vary depending on the specific cause of the issue and the cost of parts and labor. In general, replacing a faulty reductant heater, temperature sensor, or control module can range from $200 to $600, including parts and labor. Additional diagnostic time and labor costs may apply, with hourly rates typically ranging from $80 to $150 at most auto repair shops. It is recommended to obtain a detailed estimate from a qualified technician or repair facility to determine the exact cost for resolving this issue on your vehicle.
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Frequently Asked Questions about P20BD 2016 GMC Sierra Code
1. What does the OBDII code P20BD mean on a 2016 GMC Sierra?
The P20BD code indicates a problem with the Reductant Heater 2 Control Circuit, responsible for heating the diesel exhaust fluid (DEF) to ensure proper operation in cold temperatures.
2. What are the symptoms of the P20BD code on a GMC Sierra?
Common symptoms include a check engine light, possible DEF system warnings, reduced engine power, or difficulty in maintaining DEF fluid temperature during cold weather.
3. What causes the P20BD code on a 2016 GMC Sierra?
Typical causes include a faulty reductant heater, damaged wiring or connectors in the heater circuit, or a malfunctioning powertrain control module (PCM).
4. Can I continue driving with the P20BD code on my GMC Sierra?
While you can drive with this code, ignoring it may lead to DEF system issues, reduced engine performance, or difficulty passing emissions tests.
5. How is the P20BD code diagnosed?
A mechanic will use a diagnostic scanner to confirm the code, inspect the reductant heater, check wiring and connectors, and test the circuit for proper voltage and resistance.
6. How do you fix the P20BD code on a GMC Sierra?
Repairs may involve replacing the reductant heater, repairing or replacing damaged wiring or connectors, or, in rare cases, reprogramming or replacing the PCM.
7. What is the function of the reductant heater in the DEF system?
The reductant heater warms the diesel exhaust fluid in cold temperatures to prevent it from freezing and ensure proper delivery to the SCR system.
8. How much does it cost to fix the P20BD code on a GMC Sierra?
Repair costs vary but typically range from $200 to $800, depending on whether the reductant heater, wiring, or other components need replacement.
9. Can a faulty reductant heater affect emissions on a GMC Sierra?
Yes, a malfunctioning reductant heater can prevent proper DEF delivery, which may lead to increased emissions and failure to meet regulatory standards.
10. Is the P20BD code covered under warranty for a 2016 GMC Sierra?
Depending on mileage and warranty coverage, this issue may be covered under the emissions system warranty. Check with your dealer for specific details.
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