P20C7 Code - Reductant Heater 'D' Control Circuit Low
Quick Answer
The P20C7 diagnostic trouble code refers to the Reductant Heater 'D' Control Circuit Low. Common causes include Faulty reductant heater 'D', Wiring issues in the control circuit, Corrosion or damage to electrical connectors. 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
- P20C7 indicates Reductant Heater 'D' Control Circuit Low.
- Common causes
- Common causes include Faulty reductant heater 'D', Wiring issues in the control circuit, Corrosion or damage to electrical connectors.
- 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 P20C7 Description
The P20C7 diagnostic trouble code refers to the Reductant Heater 'D' Control Circuit Low. This code indicates that there is a problem with the control circuit for the reductant heater 'D' in the vehicle's selective catalytic reduction (SCR) system. The reductant heater is responsible for heating the diesel exhaust fluid (DEF) before it enters the SCR system to help reduce harmful emissions. When the control circuit is reading a low voltage or resistance, it means that the reductant heater is not functioning properly, which can lead to increased emissions and potential engine performance issues.
Common Causes of P20C7
- Faulty reductant heater 'D'
- Wiring issues in the control circuit
- Corrosion or damage to electrical connectors
- Defective SCR system module
- Software issues in the engine control module (ECM)
Symptoms of P20C7
- Check engine light illuminated
- Reduced fuel efficiency
- Poor engine performance
- Failed emissions test
- Diesel exhaust odor
How to Fix P20C7
- Begin by conducting a visual inspection of the reductant heater 'D', wiring, and connectors for any visible damage or corrosion.
- Use a multimeter to test the voltage and resistance in the control circuit to determine if the issue lies there.
- If the reductant heater 'D' is faulty, replace it with a new one following manufacturer's guidelines.
- Repair or replace any damaged wiring or connectors in the control circuit.
- Clear the diagnostic trouble codes and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P20C7
The typical repair costs for addressing a P20C7 code can vary depending on the specific cause of the issue. In general, replacing a faulty reductant heater 'D' can cost between $200 and $500, including parts and labor. However, if the issue is related to wiring or connectors, the cost may be lower. It's important to note that diagnosis time and labor rates at auto repair shops can vary, with hourly rates typically ranging between $80 and $150. It's recommended to check with local shops for a more accurate estimate based on your vehicle make and model.
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Code P20C7 Information for Specific Makes
- P20C7 Chevrolet — Reductant Heater 'D' Control Circuit Low
- P20C7 Ford — Reductant Heater 'D' Control Circuit Low
- P20C7 GMC — Reductant Heater 'D' Control Circuit Low
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