Engine-Codes.com
Engine-Codes – RAM – P20BB RAM

P20BB RAM Code - Reductant Heater 'A' Control Circuit Low

Quick Answer

The P20BB diagnostic trouble code (DTC) specifically refers to the Reductant Heater 'A' Control Circuit Low. Common causes include Faulty Reductant Heater: The Reductant Heater itself may be malfunctioning and in need of replacement, Wiring Issues: Damage to the wiring harness or connectors associated with the Reductant Heater can cause a low control circuit, Failed Sensor: A faulty temperature sensor that monitors the Reductant Heater's operation can trigger this code. 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
P20BB RAM indicates Reductant Heater 'A' Control Circuit Low.
Common causes
Common causes include Faulty Reductant Heater: The Reductant Heater itself may be malfunctioning and in need of replacement, Wiring Issues: Damage to the wiring harness or connectors associated with the Reductant Heater can cause a low control circuit, Failed Sensor: A faulty temperature sensor that monitors the Reductant Heater's operation can trigger this code.
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
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P20BB RAM Description

The P20BB diagnostic trouble code (DTC) specifically refers to the Reductant Heater 'A' Control Circuit Low. This code is typically associated with diesel vehicles that are equipped with a Selective Catalytic Reduction (SCR) system. The Reductant Heater is responsible for heating the Diesel Exhaust Fluid (DEF), also known as AdBlue, before it is injected into the exhaust stream to reduce harmful emissions.

OBDII Code P20BB RAM - Reductant Heater 'A' Control Circuit Low
P20BB RAM Code - Reductant Heater 'A' Control Circuit Low

Common Causes of P20BB RAM

  1. Faulty Reductant Heater: The Reductant Heater itself may be malfunctioning and in need of replacement.
  2. Wiring Issues: Damage to the wiring harness or connectors associated with the Reductant Heater can cause a low control circuit.
  3. Failed Sensor: A faulty temperature sensor that monitors the Reductant Heater's operation can trigger this code.
  4. ECM Malfunction: A problem with the Engine Control Module (ECM) could be preventing proper communication with the Reductant Heater.

Symptoms of P20BB RAM

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the vehicle's dashboard.
  2. Reduced Engine Performance: The vehicle may experience a decrease in engine performance, including reduced power and acceleration.
  3. Poor Fuel Economy: A malfunctioning Reductant Heater can lead to poor fuel economy as the engine may not be operating at optimal efficiency.
  4. Increased Emissions: The vehicle may produce higher emissions due to the incomplete combustion of DEF in the exhaust system.

How to Fix P20BB RAM

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the specific DTC and pinpoint the exact cause of the low control circuit.
  2. Inspect Wiring and Connections: Check the wiring harness and connectors for any damage or corrosion. Repair or replace as needed.
  3. Test Reductant Heater: Verify the functionality of the Reductant Heater and replace it if it is found to be faulty.
  4. Check Sensors: Test the temperature sensor associated with the Reductant Heater to ensure it is operating correctly.
  5. Reset Codes: Once the repair is completed, clear the DTC and reset the check engine light to ensure the issue has been resolved.

Cost to Fix P20BB RAM

The cost to repair a Reductant Heater 'A' Control Circuit Low issue can vary depending on the specific cause of the problem and the vehicle's make and model. In general, replacement parts such as a new Reductant Heater or temperature sensor can range from $200 to $500. Labor costs at an auto repair shop typically range from $80 to $150 per hour, and the total repair bill could amount to $300 to $800 or more. It's important to note that these are rough estimates, and actual costs may differ based on the factors mentioned earlier.

Need more information about the P20BB RAM code?

Need more information on how to fix the P20BB RAM code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P20BB RAM code diagnosed by a professional: Find a repair shop in your area

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.

Frequently Asked Questions about P20BB RAM Code

1. What are the common symptoms of OBDII code P20BB RAM (Reductant Heater 'A' Control Circuit Low)?

- Common symptoms may include the Check Engine Light illuminating, reduced engine performance, and potential issues with the vehicle's emissions system.

2. What are the possible causes of OBDII code P20BB RAM?

- The code P20BB RAM can be triggered by issues such as a faulty reductant heater 'A', damaged wiring or connectors in the control circuit, or a problem with the powertrain control module (PCM).

3. How can I diagnose the cause of OBDII code P20BB RAM?

- To diagnose the cause of the code P20BB RAM, a professional mechanic may use a diagnostic scanner to read the code and perform further testing on the reductant heater 'A', wiring, connectors, and PCM.

4. Can I still drive my vehicle with OBDII code P20BB RAM active?

- It is not recommended to continue driving the vehicle with the code P20BB RAM active, as it may lead to increased emissions, reduced fuel efficiency, and potential damage to the vehicle's emissions system.

5. How can I repair OBDII code P20BB RAM?

- Repairing OBDII code P20BB RAM typically involves replacing the faulty reductant heater 'A', repairing any damaged wiring or connectors, and clearing the code with a diagnostic scanner.

6. Are there any DIY tips for fixing OBDII code P20BB RAM?

- DIY repairs for OBDII code P20BB RAM may include checking and cleaning the connectors in the control circuit, inspecting for visible wire damage, and ensuring proper electrical connections.

7. How important is it to address OBDII code P20BB RAM promptly?

- It is important to address OBDII code P20BB RAM promptly to prevent further damage to the vehicle's emissions system, ensure optimal engine performance, and maintain compliance with emissions regulations.

8. Can weather conditions affect OBDII code P20BB RAM?

- Extreme weather conditions, especially cold temperatures, can potentially impact the performance of the reductant heater 'A' and contribute to triggering OBDII code P20BB RAM.

9. How long does it typically take to repair OBDII code P20BB RAM?

- The time required to repair OBDII code P20BB RAM can vary depending on the exact cause of the issue, but it may take a few hours to a full day for diagnosis and repair.

10. Will OBDII code P20BB RAM cause permanent damage to my vehicle if left unaddressed?

- Leaving OBDII code P20BB RAM unaddressed can potentially lead to permanent damage to the vehicle's emissions system, reduced fuel efficiency, and increased emissions output.

Discuss the causes and fixes for P20BB RAM OBDII Code

Submit a New Comment

Code P20BB RAM comments

No comments found for this page.