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Engine-Codes – Generic – P20FC

P20FC Code - Reductant Pump 2 Control Circuit Low

Quick Answer

The P20FC diagnostic trouble code (DTC) refers to an issue with the reductant pump 2 control circuit being detected as low. Common causes include Faulty Reductant Pump 2: The reductant pump 2 itself may be faulty, causing issues with the control circuit, Wiring Issues: Problems with the wiring harness or connectors associated with the reductant pump 2 control circuit can trigger this code, Defective Control Module: A malfunctioning SCR control module can also lead to a low control circuit signal. 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
P20FC indicates Reductant Pump 2 Control Circuit Low.
Common causes
Common causes include Faulty Reductant Pump 2: The reductant pump 2 itself may be faulty, causing issues with the control circuit, Wiring Issues: Problems with the wiring harness or connectors associated with the reductant pump 2 control circuit can trigger this code, Defective Control Module: A malfunctioning SCR control module can also lead to a low control circuit signal.
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 14, 2024
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Code P20FC Description

The P20FC diagnostic trouble code (DTC) refers to an issue with the reductant pump 2 control circuit being detected as low. In modern diesel vehicles equipped with selective catalytic reduction (SCR) systems, reductant pumps are responsible for delivering diesel exhaust fluid (DEF) to the SCR catalyst to reduce harmful emissions. The reductant pump 2 control circuit low code indicates that there is a problem with the electrical circuit that controls the operation of the reductant pump 2.

OBDII Code P20FC - Reductant Pump 2 Control Circuit Low
P20FC Code - Reductant Pump 2 Control Circuit Low

Common Causes of P20FC

  1. Faulty Reductant Pump 2: The reductant pump 2 itself may be faulty, causing issues with the control circuit.
  2. Wiring Issues: Problems with the wiring harness or connectors associated with the reductant pump 2 control circuit can trigger this code.
  3. Defective Control Module: A malfunctioning SCR control module can also lead to a low control circuit signal.
  4. Corrosion or Contamination: Corrosion or contamination in the reductant pump 2 control circuit can disrupt the signal and trigger the code.
  5. Software or Calibration Issues: Software glitches or calibration problems within the SCR system can also cause the P20FC code to appear.

Symptoms of P20FC

  1. Check Engine Light: The most common symptom associated with the P20FC code is the illumination of the check engine light on the vehicle's dashboard.
  2. Reduced Power: The vehicle may experience a reduction in power output or acceleration due to the reductant pump 2 control circuit issue.
  3. Poor Fuel Efficiency: A malfunctioning reductant pump can lead to decreased fuel efficiency as the SCR system may not be operating optimally.
  4. Increased Emissions: The vehicle may produce higher emissions than usual if the reductant pump is not functioning correctly.

How to Fix P20FC

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the DTC and perform a thorough inspection of the reductant pump 2 control circuit.
  2. Test the Reductant Pump 2: Check the functionality of the reductant pump 2 to determine if it is operating correctly.
  3. Inspect Wiring and Connectors: Examine the wiring harness and connectors for any signs of damage, corrosion, or loose connections.
  4. Replace Reductant Pump 2: If the pump is found to be faulty, replace it with a new unit to resolve the control circuit low issue.
  5. Clear DTC and Test Drive: After completing the repair, clear the DTC from the vehicle's memory and test drive to ensure the issue has been resolved.

Cost to Fix P20FC

The typical repair costs for addressing a P20FC code can vary depending on the specific cause of the issue and the vehicle's make and model. In general, replacing a faulty reductant pump 2 can cost between $300 and $600, including parts and labor. However, additional costs may be incurred if wiring repairs or control module replacement is necessary. It is recommended to consult with a qualified mechanic or auto repair shop to obtain a more accurate estimate based on the individual circumstances of the vehicle. Keep in mind that diagnosis time and labor rates can vary, so it's advisable to inquire about these factors when seeking repairs for this issue.

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Code P20FC 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 P20FC Code

1. What are the common symptoms of OBDII code P20FC (Reductant Pump 2 Control Circuit Low)?

- Common symptoms include illuminated check engine light, reduced engine performance, and potential failure to pass emissions testing.

2. What are the possible causes of OBDII code P20FC?

- Possible causes include a faulty reductant pump 2, damaged wiring or connectors in the control circuit, or a malfunctioning powertrain control module (PCM).

3. How can I diagnose the root cause of OBDII code P20FC?

- Diagnose the code by using a scan tool to retrieve the specific fault code, inspecting the reductant pump 2 and its wiring for damage, and testing the control circuit components for proper functionality.

4. Can I continue driving with OBDII code P20FC present?

- It is not recommended to drive with the code present, as it can lead to reduced engine performance and potential damage to the emissions control system.

5. How can I repair OBDII code P20FC?

- Repair options include replacing the faulty reductant pump 2, repairing damaged wiring or connectors in the control circuit, or reprogramming the PCM if necessary.

6. Will resetting the code make it go away permanently?

- Resetting the code without addressing the underlying issue will not make it go away permanently. The root cause must be diagnosed and repaired to prevent the code from returning.

7. Can a DIY enthusiast fix OBDII code P20FC at home?

- Depending on the skill level and access to tools, a DIY enthusiast may be able to diagnose and repair OBDII code P20FC at home. However, complex issues may require professional assistance.

8. How much does it typically cost to repair OBDII code P20FC?

- The cost of repairing OBDII code P20FC can vary depending on the root cause and the labor rates of the repair shop. Costs may include parts, labor, and diagnostic fees.

9. Is OBDII code P20FC a common issue in certain car models?

- OBDII code P20FC related to the reductant pump 2 control circuit low is more commonly found in vehicles equipped with diesel engines and Selective Catalytic Reduction (SCR) systems.

10. How can I prevent OBDII code P20FC from occurring in the future?

- To prevent OBDII code P20FC, it is important to perform regular maintenance on the emissions control system, avoid rough driving conditions, and address any warning lights or symptoms promptly.

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