P20C8 Chevrolet Code - Reductant Heater 'D' Control Circuit High
Quick Answer
The P20C8 diagnostic trouble code (DTC) for Chevrolet vehicles refers to an issue with the Reductant Heater 'D' control circuit being too high. Common causes include Faulty Reductant Heater 'D', Wiring or connector issues in the control circuit, Corrosion or damage to the electrical components related to 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
- P20C8 Chevrolet indicates Reductant Heater 'D' Control Circuit High.
- Common causes
- Common causes include Faulty Reductant Heater 'D', Wiring or connector issues in the control circuit, Corrosion or damage to the electrical components related to 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 P20C8 Chevrolet Description
The P20C8 diagnostic trouble code (DTC) for Chevrolet vehicles refers to an issue with the Reductant Heater 'D' control circuit being too high. In vehicles equipped with diesel engines, the Reductant Heater is a crucial component of the Selective Catalytic Reduction (SCR) system. The SCR system helps reduce harmful nitrogen oxide (NOx) emissions by injecting a urea-based solution (commonly known as diesel exhaust fluid or DEF) into the exhaust stream. The Reductant Heater is responsible for heating the DEF to the optimal temperature for the SCR system to function effectively.
Common Causes of P20C8 Chevrolet
- Faulty Reductant Heater 'D'.
- Wiring or connector issues in the control circuit.
- Corrosion or damage to the electrical components related to the Reductant Heater.
- Software or calibration issues in the engine control module.
- Extreme temperature fluctuations affecting the Reductant Heater operation.
Symptoms of P20C8 Chevrolet
- Check Engine Light illuminated on the dashboard.
- Reduced fuel efficiency.
- Poor engine performance or hesitation during acceleration.
- Increased emissions output.
- Possible DEF freezing in cold weather conditions.
How to Fix P20C8 Chevrolet
- Begin by conducting a thorough inspection of the Reductant Heater 'D' and its associated wiring, looking for any visible signs of damage or corrosion.
- Use a multimeter to test the voltage output from the control circuit to determine if it is within the specified range.
- Check for any software updates or recalibrations recommended by the manufacturer to address potential programming issues.
- Replace the Reductant Heater 'D' if it is found to be faulty, ensuring proper installation and connection of the new component.
- Clear the DTC and reset the vehicle's computer system to see if the issue has been resolved.
Cost to Fix P20C8 Chevrolet
The cost of repairing a P20C8 code related to the Reductant Heater 'D' control circuit high can vary depending on the specific cause of the issue and the labor rates in your area. On average, the parts for this repair can range from $200 to $500, with labor costs adding an additional $100 to $200. Keep in mind that diagnostic time and labor rates at auto repair shops can fluctuate, so it's advisable to obtain a detailed quote from a trusted mechanic before proceeding with the repairs.
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