P20C0 2016 GMC Sierra Code - Reductant Heater 2 Control Circuit High Voltage
Quick Answer
The P20C0 diagnostic trouble code (DTC) for a 2016 GMC Sierra relates to the Reductant Heater 2 Control Circuit High Voltage. Common causes include Faulty Reductant Heater: The most common cause of the P20C0 code is a malfunctioning reductant heater itself, Wiring Issues: Problems with the wiring or connectors in the control circuit can also trigger this code, Defective Control Module: A faulty control module responsible for regulating the reductant heater can lead to high voltage issues. 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 2016 GMC Sierra indicates Reductant Heater 2 Control Circuit High Voltage.
- Common causes
- Common causes include Faulty Reductant Heater: The most common cause of the P20C0 code is a malfunctioning reductant heater itself, Wiring Issues: Problems with the wiring or connectors in the control circuit can also trigger this code, Defective Control Module: A faulty control module responsible for regulating the reductant heater can lead to high voltage issues.
- 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 2016 GMC Sierra Description
The P20C0 diagnostic trouble code (DTC) for a 2016 GMC Sierra relates to the Reductant Heater 2 Control Circuit High Voltage. This code indicates that there is a problem with the control circuit for the reductant heater, specifically that the voltage is too high. The reductant heater is a crucial component of the selective catalytic reduction (SCR) system, which helps reduce harmful emissions from the vehicle's exhaust.
Common Causes of P20C0 2016 GMC Sierra
- Faulty Reductant Heater: The most common cause of the P20C0 code is a malfunctioning reductant heater itself.
- Wiring Issues: Problems with the wiring or connectors in the control circuit can also trigger this code.
- Defective Control Module: A faulty control module responsible for regulating the reductant heater can lead to high voltage issues.
- Software Glitch: Occasionally, a software glitch in the vehicle's engine control module (ECM) can cause erroneous high voltage readings.
Symptoms of P20C0 2016 GMC Sierra
- Check Engine Light: The most common symptom associated with the P20C0 code is the illumination of the check engine light on the vehicle's dashboard.
- Reduced Fuel Efficiency: A malfunctioning reductant heater can lead to decreased fuel efficiency as the SCR system may not be operating optimally.
- Poor Performance: The vehicle may experience a reduction in performance, such as sluggish acceleration or rough idling.
- Emissions Issues: The vehicle may fail emissions tests due to increased emissions caused by the malfunctioning reductant heater.
How to Fix P20C0 2016 GMC Sierra
- Diagnose the Issue: Use a diagnostic scanner to retrieve the DTC and pinpoint the exact cause of the high voltage in the reductant heater control circuit.
- Inspect Wiring and Connectors: Check the wiring and connectors associated with the reductant heater for any signs of damage or corrosion. Repair or replace as necessary.
- Test Reductant Heater: Test the reductant heater to ensure it is functioning correctly. Replace if found to be faulty.
- Check Control Module: Inspect the control module for any signs of damage or malfunction. Replace if necessary.
- Clear DTC: After completing the repairs, clear the DTC and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P20C0 2016 GMC Sierra
The typical repair costs for addressing a P20C0 code on a 2016 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of parts for a reductant heater replacement can range from $200 to $500, while labor costs can range from $100 to $300. Overall, the total repair cost for this issue may fall between $300 and $800. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate.
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Frequently Asked Questions about P20C0 2016 GMC Sierra Code
1. What are the common symptoms of OBDII code P20C0 in a 2016 GMC Sierra?
- Common symptoms include the Check Engine light coming on, reduced engine performance, and possible increased fuel consumption.
2. What does the OBDII code P20C0 indicate in a 2016 GMC Sierra?
- The code P20C0 indicates a malfunction in the Reductant Heater 2 Control Circuit, specifically high voltage.
3. What are the possible causes of OBDII code P20C0 in a 2016 GMC Sierra?
- Possible causes include a faulty Reductant Heater 2, damaged wiring or connectors in the control circuit, or a malfunctioning powertrain control module.
4. How can I diagnose the OBDII code P20C0 in my 2016 GMC Sierra?
- Diagnosis typically involves using a scan tool to retrieve the specific fault code, checking the wiring and connectors related to the Reductant Heater 2, and testing the heater itself for proper function.
5. Can I continue driving my 2016 GMC Sierra with OBDII code P20C0?
- It is not recommended to continue driving with this code present, as it can lead to reduced engine performance and potential damage to emission control components.
6. How can I repair OBDII code P20C0 in my 2016 GMC Sierra?
- Repair may involve replacing the Reductant Heater 2, repairing or replacing damaged wiring or connectors, or reprogramming the powertrain control module.
7. Is it safe to clear the OBDII code P20C0 in my 2016 GMC Sierra without addressing the issue?
- Clearing the code without addressing the underlying problem may temporarily turn off the Check Engine light, but the issue will likely resurface, causing potential performance issues and emission problems.
8. Can a DIY enthusiast fix OBDII code P20C0 in a 2016 GMC Sierra?
- Depending on the underlying cause, a DIY enthusiast with the right tools and knowledge may be able to address the issue, such as replacing the Reductant Heater 2 or repairing damaged wiring.
9. How much does it typically cost to repair OBDII code P20C0 in a 2016 GMC Sierra at a repair shop?
- The cost of repair can vary depending on the specific cause of the code, but it may range from a few hundred to over a thousand dollars, including parts and labor.
10. Will OBDII code P20C0 cause my 2016 GMC Sierra to fail an emissions test?
- Yes, having this code present can cause your vehicle to fail an emissions test due to the malfunction in the Reductant Heater 2 Control Circuit.
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