P20C0 2017 GMC Sierra Code - Reductant Heater 2 Control Circuit High Voltage
Quick Answer
The P20C0 diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates a problem with the Reductant Heater 2 Control Circuit High Voltage. Common causes include Faulty Reductant Heater: The most common cause of this code is a malfunctioning reductant heater itself, Wiring Issues: Problems with the wiring harness or connectors associated with the reductant heater circuit can also trigger this code, Corrosion: Corrosion or damage to the electrical connections can disrupt the proper functioning of the reductant 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
- P20C0 2017 GMC Sierra indicates Reductant Heater 2 Control Circuit High Voltage.
- Common causes
- Common causes include Faulty Reductant Heater: The most common cause of this code is a malfunctioning reductant heater itself, Wiring Issues: Problems with the wiring harness or connectors associated with the reductant heater circuit can also trigger this code, Corrosion: Corrosion or damage to the electrical connections can disrupt the proper functioning of the reductant 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.
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Code P20C0 2017 GMC Sierra Description
The P20C0 diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates a problem with the Reductant Heater 2 Control Circuit High Voltage. In vehicles equipped with Selective Catalytic Reduction (SCR) systems, the reductant heater is responsible for heating the Diesel Exhaust Fluid (DEF) before it is injected into the exhaust stream to reduce harmful emissions. The Reductant Heater 2 Control Circuit High Voltage code suggests that there is an issue with the electrical circuit controlling the heater, causing it to operate at a higher voltage than normal.
Common Causes of P20C0 2017 GMC Sierra
- Faulty Reductant Heater: The most common cause of this code is a malfunctioning reductant heater itself.
- Wiring Issues: Problems with the wiring harness or connectors associated with the reductant heater circuit can also trigger this code.
- Corrosion: Corrosion or damage to the electrical connections can disrupt the proper functioning of the reductant heater.
- Software Glitch: Occasionally, a software glitch in the vehicle's engine control module (ECM) can erroneously trigger the P20C0 code.
Symptoms of P20C0 2017 GMC Sierra
- Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the vehicle's dashboard.
- Reduced Fuel Efficiency: A malfunctioning reductant heater can lead to increased fuel consumption due to inefficient emissions control.
- Failed Emissions Test: If the reductant heater is not functioning properly, the vehicle may fail emissions tests due to higher NOx emissions.
- Rough Idle: In some cases, a faulty reductant heater can cause the engine to idle roughly or inconsistently.
How to Fix P20C0 2017 GMC Sierra
- Diagnose the Issue: Use a diagnostic scanner to retrieve the specific trouble code and perform a thorough inspection of the reductant heater circuit.
- Check Wiring and Connections: Inspect the wiring harness and connectors for any signs of damage, corrosion, or loose connections.
- Test Reductant Heater: Test the reductant heater itself to determine if it is functioning correctly or needs to be replaced.
- Clear Codes: After repairing the issue, clear the trouble codes from the vehicle's ECM and test drive the vehicle to ensure the problem has been resolved.
Cost to Fix P20C0 2017 GMC Sierra
The cost of repairing a P20C0 code on a 2017 GMC Sierra can vary depending on the specific cause of the issue. In general, replacing a faulty reductant heater or repairing wiring issues can range from $200 to $600, including parts and labor. However, additional costs may apply if other components of the SCR system need to be replaced. It is recommended to consult with a qualified mechanic or dealership for a more accurate cost estimate based on the specific diagnosis and repair needed. Keep in mind that labor rates can vary between auto repair shops, so it's advisable to inquire about rates in your area for a more precise estimate.
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Frequently Asked Questions about P20C0 2017 GMC Sierra Code
1. What are the common symptoms of OBDII code P20C0 in a 2017 GMC Sierra?
- Common symptoms include the Check Engine light illuminating, reduced engine performance, and potential issues with the vehicle's emissions system.
2. What does the OBDII code P20C0 "Reductant Heater 2 Control Circuit High Voltage" indicate in a 2017 GMC Sierra?
- This code indicates that there is a high voltage condition detected in the control circuit for Reductant Heater 2 in the emissions system.
3. What are the possible causes of OBDII code P20C0 in a 2017 GMC Sierra?
- Possible causes include a faulty reductant heater, damaged wiring or connectors in the control circuit, a defective powertrain control module (PCM), or a software issue.
4. How can I diagnose the OBDII code P20C0 in my 2017 GMC Sierra?
- Diagnosing this code typically involves checking the reductant heater 2 circuit for proper voltage levels, inspecting wiring for damage, and testing the PCM for proper operation.
5. Can I continue driving my 2017 GMC Sierra with OBDII code P20C0 present?
- It is generally not recommended to continue driving the vehicle with this code present, as it can lead to decreased fuel efficiency and potential damage to the emissions system.
6. How can I repair OBDII code P20C0 in my 2017 GMC Sierra?
- Repairing this code may involve replacing the reductant heater 2, repairing damaged wiring or connectors, resetting the PCM, and clearing the error code from the system.
7. Is it possible to reset the OBDII code P20C0 in a 2017 GMC Sierra without making repairs?
- While you can reset the code using an OBDII scanner, it is crucial to address the underlying issue causing the code to prevent it from reoccurring.
8. Can extreme weather conditions cause OBDII code P20C0 to trigger in a 2017 GMC Sierra?
- Extreme temperatures can potentially impact the reductant heater's performance and lead to issues triggering this code, especially in very cold or hot conditions.
9. Will OBDII code P20C0 impact my 2017 GMC Sierra's emissions test results?
- Yes, this code can affect your vehicle's emissions, potentially causing it to fail an emissions test until the issue is resolved.
10. How long does it typically take to repair OBDII code P20C0 in a 2017 GMC Sierra?
- The repair time can vary based on the exact cause of the issue, but it may take a few hours to a full day to diagnose, repair, and clear the code from the system.
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