P20C6 GMC Code - Reductant Heater 'D' Control Circuit Performance
Quick Answer
The reductant heater and sender assembly contains pickup tube for reductant pump module, an electric heating element, a reductant temperature sensor and an electrode type level sensor. 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
- P20C6 GMC indicates Reductant Heater 'D' Control Circuit Performance.
- 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 P20C6 GMC Description
What are the Possible Causes of the DTC P20C6 GMC?
- Faulty Reductant Heater
- Reductant Heater harness is open or shorted
- Reductant Heater circuit poor electrical connection
How to Fix the DTC P20C6 GMC?
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 P20C6 GMC 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.
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Frequently Asked Questions about P20C6 GMC Code
What does the OBDII code P20C6 mean for a GMC vehicle?
P20C6 indicates an issue with the performance of the Reductant Heater 'D' Control Circuit, which is part of the diesel exhaust fluid (DEF) system responsible for reducing emissions in diesel engines.
What are the common symptoms of code P20C6 in a GMC?
Symptoms may include the check engine light turning on, reduced fuel efficiency, poor engine performance, and potential issues with the DEF system, such as freezing in cold weather.
What causes the P20C6 code to appear in a GMC vehicle?
Common causes include a malfunctioning reductant heater, damaged wiring or connectors in the heater circuit, a faulty heater control module, or corrosion in the electrical connections.
Can I drive my GMC with the P20C6 code active?
Driving with this code is not recommended, as it can lead to increased emissions, potential damage to the DEF system, and reduced engine performance over time.
How is the P20C6 code diagnosed in a GMC?
A mechanic will use an OBDII scanner to confirm the code, inspect the reductant heater and its wiring, test the heater's resistance, and check the control circuit for proper voltage and continuity.
What repairs are commonly needed for a P20C6 code?
Repairs may include replacing the reductant heater, repairing or replacing damaged wiring or connectors, cleaning corroded connections, or updating/reprogramming the control module if needed.
How much does it typically cost to fix the P20C6 code on a GMC?
Repair costs can vary depending on the issue, but replacing a reductant heater typically ranges from $300 to $700, including parts and labor.
Can cold weather cause the P20C6 code?
Yes, cold weather can exacerbate the issue if the reductant heater fails to prevent diesel exhaust fluid from freezing, which can trigger this code.
Is the P20C6 code covered under warranty for GMC vehicles?
It depends on your vehicle’s warranty coverage and mileage. Check with your dealership, as emissions-related components may be covered under federal emissions warranties.
Can I reset the P20C6 code without making repairs?
While you can clear the code with an OBDII scanner, it will likely return if the underlying issue is not resolved, potentially leading to further complications.
Discuss the causes and fixes for P20C6 GMC OBDII Code
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