P20C0 2015 GMC Sierra Code - Reductant Heater 2 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
- P20C0 2015 GMC Sierra indicates Reductant Heater 2 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 P20C0 2015 GMC Sierra Description
The Diagnostic Trouble Code (DTC) will be set when the ECM indicates the reductant line heater control circuit is shorted to a voltage for greater than 4 s.
What are the Possible Causes of the DTC P20C0 2015 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 P20C0 2015 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 P20C0 2015 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 P20C0 2015 GMC Sierra code?
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Need Help with the Code?
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Frequently Asked Questions about P20C0 2015 GMC Sierra Code
What does the OBDII code P20C0 mean for a 2015 GMC Sierra?
P20C0 indicates an issue with the Reductant Heater 2 Control Circuit, specifically a high voltage condition detected by the vehicle’s ECM.
What are the common symptoms of code P20C0 in a 2015 GMC Sierra?
Symptoms may include a Check Engine Light, poor DEF system performance, failure to meet emissions standards, and reduced power or fuel efficiency.
What causes the P20C0 code to appear in a GMC Sierra?
Common causes include a faulty reductant heater, damaged wiring or connectors in the heater circuit, or a malfunctioning ECM.
Can I drive my 2015 GMC Sierra with the P20C0 code?
While the vehicle may still be drivable, ignoring this code can lead to reduced emissions system efficiency and potential long-term damage. It’s best to address the issue promptly.
How do I fix the P20C0 code on a GMC Sierra?
Repairs may involve inspecting and replacing damaged wiring, connectors, or the reductant heater itself. In some cases, the ECM may need to be reprogrammed or replaced.
How do I diagnose the P20C0 code on my 2015 GMC Sierra?
Use an OBDII scanner to verify the code, then inspect the reductant heater circuit for damaged wiring, loose connections, or signs of corrosion. Test the heater’s resistance and voltage output.
What is the function of the reductant heater in a GMC Sierra?
The reductant heater warms the DEF (Diesel Exhaust Fluid) in cold temperatures to ensure proper operation of the emissions system.
What tools are needed to fix the P20C0 code?
You’ll need an OBDII scanner, a multimeter for electrical testing, and basic hand tools to inspect and repair wiring or replace components.
How much does it cost to repair the P20C0 code in a GMC Sierra?
The cost can vary depending on the issue, but reductant heaters typically cost $150-$300, plus labor if handled by a professional. Wiring repairs may cost less.
Can a faulty reductant heater cause other problems in my GMC Sierra?
Yes, a malfunctioning heater can lead to poor DEF system performance, increased emissions, and potential engine derating in severe cases.
Discuss the causes and fixes for P20C0 2015 GMC Sierra OBDII Code
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