What Does the P20B6 Code Mean?
The P20B6 code is an OBD-II trouble code that indicates a problem with the Reductant Metering Unit Heater Control Circuit. This code is triggered when the heating unit for the Diesel Exhaust Fluid (DEF) system fails to operate as expected. This component is crucial for preventing the DEF fluid from freezing or crystallizing, which is essential for proper engine emissions control.
What Causes the P20B6 Code?
The P20B6 code can be caused by several issues, including:
- Failure of the delivery module heater
- Power heater module power switch failure
- Wiring issues that disrupt the electrical circuit
What Are the Symptoms of the P20B6 Code?
Common symptoms associated with the P20B6 code include:
- Inability to perform DPF (Diesel Particulate Filter) regeneration
- Increased emissions
- Check Engine Light activated on the dashboard
How Serious Is the P20B6 Code?
The P20B6 code is considered urgent. Ignoring this issue can lead to severe damage to the vehicle’s exhaust system and may result in increased emissions, which can be harmful to the environment and may violate emissions regulations.
How to Diagnose the P20B6 Code
To diagnose the P20B6 code, a mechanic will typically follow these steps:
- Use an OBD-II scanner to confirm the P20B6 code and check for any additional trouble codes.
- Inspect the wiring and connectors related to the Reductant Metering Unit for signs of damage or corrosion.
- Test the delivery module heater and power switch for functionality.
- Check the DEF fluid level and quality.
Common Repairs for the P20B6 Code
Common repairs that may be necessary to resolve the P20B6 code include:
- Replacing the delivery module heater
- Repairing or replacing damaged wiring
- Replacing the power heater module power switch
How Much Does It Cost to Fix the P20B6 Code?
The cost to repair the P20B6 code can vary widely based on the specific issue and the make and model of the vehicle. On average, repairs can range from $100 to $1,000 or more, particularly if significant components need to be replaced.
Can I Fix the P20B6 Code Myself?
While some DIY enthusiasts may be able to address minor wiring issues or replace easily accessible components, it is recommended to seek professional assistance for diagnosing and fixing the P20B6 code. Proper diagnosis is crucial to ensure that the underlying issue is accurately identified and repaired.
