P20BC 2014 GMC Sierra Code - Reductant Heater 1 Control Circuit High 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
- P20BC 2014 GMC Sierra indicates Reductant Heater 1 Control Circuit High 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 P20BC 2014 GMC Sierra Description
The Diagnostic Trouble Code (DTC) will be set when the ECM indicates the reductant tank heater control circuit is shorted to a voltage for greater than 4 s.
What are the Possible Causes of the DTC P20BC 2014 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 P20BC 2014 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 P20BC 2014 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 P20BC 2014 GMC Sierra code?
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Frequently Asked Questions about P20BC 2014 GMC Sierra Code
1. What are common symptoms of OBDII code P20BC in a 2014 GMC Sierra?
- Common symptoms include the check engine light being illuminated, reduced engine performance, and potentially poor fuel economy.
2. What does the OBDII code P20BC indicate in a 2014 GMC Sierra?
- The code P20BC indicates a high voltage condition in the control circuit of Reductant Heater 1 in the vehicle's emissions system.
3. What are possible causes of OBDII code P20BC in a 2014 GMC Sierra?
- Possible causes include a faulty reductant heater 1, damaged wiring or connectors in the control circuit, or a malfunctioning powertrain control module (PCM).
4. How can I diagnose the issue triggering OBDII code P20BC in my 2014 GMC Sierra?
- Diagnosis typically involves checking the wiring and connectors related to Reductant Heater 1, testing the heater itself for proper operation, and using a scan tool to monitor voltage readings.
5. Can I continue driving my 2014 GMC Sierra with OBDII code P20BC?
- It is generally not recommended to continue driving with this code active, as it can lead to increased emissions and potential damage to the emissions control system.
6. Is it safe to clear the OBDII code P20BC in my 2014 GMC Sierra with a scan tool?
- Clearing the code with a scan tool may temporarily turn off the check engine light, but it will not fix the underlying issue causing the high voltage condition in the Reductant Heater 1 control circuit.
7. Can I repair OBDII code P20BC in my 2014 GMC Sierra myself?
- Repairing this code may require advanced diagnostic tools and knowledge, so it is often best left to experienced mechanics or technicians familiar with emissions system repairs.
8. How much does it typically cost to repair OBDII code P20BC in a 2014 GMC Sierra?
- Repair costs can vary depending on the exact cause of the issue, but it may involve replacing the reductant heater, repairing wiring, or reprogramming the PCM, with costs ranging from a few hundred to over a thousand dollars.
9. Will OBDII code P20BC cause my 2014 GMC Sierra to fail an emissions test?
- Yes, having this code active will likely cause your vehicle to fail an emissions test, as it indicates a problem with the emissions control system that needs to be addressed.
10. How can I prevent OBDII code P20BC from reoccurring in my 2014 GMC Sierra?
- Regular maintenance, such as checking and replacing faulty components in the emissions system, can help prevent the reoccurrence of this code.
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