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P20B6 RAM Code - Diesel Exhaust Fluid Reductant Pump Heater Control Performance

Quick Answer

The P20B6 diagnostic code refers to an issue with the Diesel Exhaust Fluid (DEF) Reductant Pump Heater Control Performance in a vehicle. Common causes include Faulty DEF Reductant Pump Heater: The heater itself may be malfunctioning and not heating the DEF fluid properly, Sensor Issues: Problems with the sensors that monitor the DEF system could trigger this code, Wiring Problems: Corroded or damaged wiring can disrupt the communication between components in the DEF system. 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
P20B6 RAM indicates Diesel Exhaust Fluid Reductant Pump Heater Control Performance.
Common causes
Common causes include Faulty DEF Reductant Pump Heater: The heater itself may be malfunctioning and not heating the DEF fluid properly, Sensor Issues: Problems with the sensors that monitor the DEF system could trigger this code, Wiring Problems: Corroded or damaged wiring can disrupt the communication between components in the DEF system.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
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Code P20B6 RAM Description

The P20B6 diagnostic code refers to an issue with the Diesel Exhaust Fluid (DEF) Reductant Pump Heater Control Performance in a vehicle. This system is an essential part of the Selective Catalytic Reduction (SCR) system, which helps reduce harmful emissions in diesel engines. The DEF Reductant Pump Heater is responsible for heating the DEF fluid to ensure it can effectively react with the exhaust gases and convert harmful pollutants into less harmful substances like nitrogen and water vapor.

OBDII Code P20B6 RAM - Diesel Exhaust Fluid Reductant Pump Heater Control Performance
P20B6 RAM Code - Diesel Exhaust Fluid Reductant Pump Heater Control Performance

Common Causes of P20B6 RAM

  1. Faulty DEF Reductant Pump Heater: The heater itself may be malfunctioning and not heating the DEF fluid properly.
  2. Sensor Issues: Problems with the sensors that monitor the DEF system could trigger this code.
  3. Wiring Problems: Corroded or damaged wiring can disrupt the communication between components in the DEF system.
  4. DEF Fluid Quality: Using low-quality or contaminated DEF fluid can also cause issues with the system.

Symptoms of P20B6 RAM

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the dashboard.
  2. Reduced Power: The vehicle may go into a reduced power mode to protect the engine from potential damage.
  3. Poor Fuel Efficiency: A decrease in fuel efficiency may occur due to the improper functioning of the DEF Reductant Pump Heater.
  4. Failed Emissions Test: If the issue is not addressed, it can lead to increased emissions and may cause the vehicle to fail emissions tests.

How to Fix P20B6 RAM

  1. Diagnose the Issue: Use a scan tool to read the code and identify the specific component causing the problem.
  2. Check DEF Reductant Pump Heater: Test the heater to determine if it is functioning correctly and replace if necessary.
  3. Inspect Sensors and Wiring: Check the sensors and wiring for any damage or corrosion, and repair or replace as needed.
  4. Clear the Code: After making the necessary repairs, clear the diagnostic code and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P20B6 RAM

The cost of repairing the DEF Reductant Pump Heater Control Performance issue can vary depending on the specific cause of the problem and the make and model of the vehicle. On average, the repair costs for this issue can range from $200 to $600, including parts and labor. However, it's important to note that the actual cost may be higher or lower based on the severity of the problem and the rates of the auto repair shop. Additionally, diagnostic time and labor rates can vary, so it's advisable to check with local shops for a more accurate estimate.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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