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Engine-Codes – RAM – P20B9 RAM

P20B9 RAM Code - Reductant Heater 'A' Control Circuit Open

Quick Answer

The P20B9 diagnostic trouble code (DTC) refers to a fault in the reductant heater 'A' control circuit being open. Common causes include Faulty reductant heater 'A', Wiring or connector issues in the control circuit, Corrosion or damage to electrical connections. 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
P20B9 RAM indicates Reductant Heater 'A' Control Circuit Open.
Common causes
Common causes include Faulty reductant heater 'A', Wiring or connector issues in the control circuit, Corrosion or damage to electrical connections.
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 Aug 19, 2024
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Code P20B9 RAM Description

The P20B9 diagnostic trouble code (DTC) refers to a fault in the reductant heater 'A' control circuit being open. This code is specific to vehicles equipped with a diesel engine and a selective catalytic reduction (SCR) system. The reductant heater is responsible for warming the diesel exhaust fluid (DEF) to ensure optimal performance of the SCR system.

OBDII Code P20B9 RAM - Reductant Heater 'A' Control Circuit Open
P20B9 RAM Code - Reductant Heater 'A' Control Circuit Open

Common Causes of P20B9 RAM

  1. Faulty reductant heater 'A'
  2. Wiring or connector issues in the control circuit
  3. Corrosion or damage to electrical connections
  4. ECM (Engine Control Module) malfunction
  5. Software issues

Symptoms of P20B9 RAM

  1. Check engine light illuminated
  2. Reduced engine performance
  3. Increased emissions
  4. Failed emissions test
  5. Poor fuel economy

How to Fix P20B9 RAM

  1. Diagnose the specific cause of the open circuit (e.g., test the reductant heater, check wiring for continuity)
  2. Repair or replace any damaged wiring or connectors
  3. Test the ECM for proper function and reprogram if necessary
  4. Clear the DTC and reset the ECM
  5. Test drive the vehicle to ensure the issue has been resolved

Cost to Fix P20B9 RAM

The typical repair costs for addressing a P20B9 code can range from $200 to $500, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that diagnosis time and labor rates can vary, so it's recommended to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on your vehicle's make and model.

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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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