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Engine-Codes – Generic – P20FA

P20FA Code - Reductant Pump 2 Control Circuit Open

Quick Answer

The P20FA diagnostic trouble code refers to the Reductant Pump 2 Control Circuit Open. Common causes include Faulty Reductant Pump: The most common cause of the P20FA code is a malfunctioning reductant pump that is unable to supply DEF to the SCR system, Wiring Issues: Damaged or corroded wiring connections between the reductant pump and the vehicle's computer system can cause an open circuit, Defective Control Module: A faulty control module responsible for regulating the reductant pump operation can also 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
P20FA indicates Reductant Pump 2 Control Circuit Open.
Common causes
Common causes include Faulty Reductant Pump: The most common cause of the P20FA code is a malfunctioning reductant pump that is unable to supply DEF to the SCR system, Wiring Issues: Damaged or corroded wiring connections between the reductant pump and the vehicle's computer system can cause an open circuit, Defective Control Module: A faulty control module responsible for regulating the reductant pump operation can also 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 08, 2024
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Code P20FA Description

The P20FA diagnostic trouble code refers to the Reductant Pump 2 Control Circuit Open. This code is commonly found in diesel vehicles equipped with a selective catalytic reduction (SCR) system, which helps reduce harmful emissions. The reductant pump is responsible for supplying the diesel exhaust fluid (DEF) to the SCR system, where it reacts with harmful nitrogen oxides (NOx) to convert them into harmless nitrogen and water vapor.

OBDII Code P20FA - Reductant Pump 2 Control Circuit Open
P20FA Code - Reductant Pump 2 Control Circuit Open

Common Causes of P20FA

  1. Faulty Reductant Pump: The most common cause of the P20FA code is a malfunctioning reductant pump that is unable to supply DEF to the SCR system.
  2. Wiring Issues: Damaged or corroded wiring connections between the reductant pump and the vehicle's computer system can cause an open circuit.
  3. Defective Control Module: A faulty control module responsible for regulating the reductant pump operation can also trigger this code.
  4. Software Malfunction: Issues with the vehicle's software or programming can disrupt the communication between the reductant pump and the control module.

Symptoms of P20FA

  1. Illuminated Check Engine Light: The most common symptom associated with the P20FA 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 power, acceleration, and overall performance.
  3. Increased Emissions: The vehicle may fail emissions tests due to the increased emissions resulting from the malfunctioning SCR system.
  4. Poor Fuel Efficiency: A decrease in fuel efficiency may be noticed as a result of the SCR system not operating at its optimal level.

How to Fix P20FA

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the trouble codes and perform a thorough inspection of the reductant pump and its related components.
  2. Check Wiring Connections: Inspect the wiring harness for any damage, corrosion, or loose connections. Repair or replace any faulty wiring as needed.
  3. Test the Reductant Pump: Test the reductant pump to ensure it is functioning correctly. Replace the pump if it is found to be faulty.
  4. Check Control Module: Inspect the control module for any signs of damage or malfunction. Replace the control module if necessary.
  5. Clear Codes and Test Drive: After completing the repairs, clear the trouble codes from the vehicle's computer system and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P20FA

The cost of repairing a P20FA code related to the Reductant Pump 2 Control Circuit Open can vary depending on the extent of the issue and the cost of parts and labor. On average, the repair costs for this issue can range from $200 to $600, including parts and labor. However, it is important to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It is recommended to check with local shops for a more accurate estimate.

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Code P20FA Information for Specific Makes

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 P20FA Code

1. What does the OBDII code P20FA mean?

P20FA indicates an issue with the control circuit for Reductant Pump 2, which is part of the diesel exhaust fluid (DEF) system. Specifically, the circuit is open or disconnected.

2. What are the common symptoms of code P20FA?

Symptoms may include the check engine light turning on, decreased fuel efficiency, reduced engine performance, or DEF system-related warnings on the dashboard.

3. What causes the P20FA code to trigger?

Common causes include damaged wiring or connectors, a faulty reductant pump, a malfunctioning control module, or corrosion in the electrical circuit.

4. Can I drive with a P20FA code?

While driving with this code is usually possible, the DEF system's malfunction may eventually lead to reduced engine power or restrictions as part of emissions compliance protocols.

5. How do I diagnose the P20FA code?

Start by inspecting the wiring and connectors for damage or corrosion. Use a multimeter to test for continuity in the circuit and check the reductant pump for proper operation.

6. How is the P20FA code fixed?

Repairs may involve replacing damaged wiring, repairing corroded connectors, replacing the reductant pump, or reprogramming the control module if necessary.

7. Is the reductant pump the only component that can fail with P20FA?

No, the issue may also stem from the wiring, connectors, or the control module responsible for managing the reductant pump.

8. How much does it cost to repair the P20FA code?

The cost varies depending on the issue, but replacing a reductant pump can cost $400–$1,000, while wiring or connector repairs are typically less expensive.

9. Can a software update fix the P20FA code?

In some cases, a control module software update may resolve the issue if the problem is related to software glitches rather than hardware failure.

10. What tools are needed to troubleshoot the P20FA code?

Basic tools include an OBDII scanner, a multimeter for electrical testing, and potentially a wiring diagram for the DEF system to trace the circuit.

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