AutoCodes – RAM – P20FB RAM

P20FB RAM Code - Reductant Pump 2 Control Performance

Quick Answer

The Powertrain Control Module (PCM) monitors the Diesel Exhaust Fluid (DEF) pressure buildup system to provide correct (overall) performance. Common causes include Faulty Diesel Exhaust Fluid (DEF) Pump, Diesel Exhaust Fluid Pump harness is open or shorted, Diesel Exhaust Fluid Pump circuit poor electrical connection. 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: P20FB RAM indicates Reductant Pump 2 Control Performance.
Common causes: Common causes include Faulty Diesel Exhaust Fluid (DEF) Pump, Diesel Exhaust Fluid Pump harness is open or shorted, Diesel Exhaust Fluid Pump circuit poor electrical connection.
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.

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Code Popularity 1,088

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 18, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P20FB RAM Description

The Powertrain Control Module (PCM) monitors the Diesel Exhaust Fluid (DEF) pressure buildup system to provide correct (overall) performance. If excessive air is detected during pressure buildup, the Purge Pump system draws fluid back into the DEF tank to remove the air. Once the purge is complete the pressure buildup is reinitialized. The Diagnostic Trouble Code (DTC) will be set when the PCM detects that a comparison of the DEF Pump pressure before and after the Pressure Reduction procedure indicates a difference that is less than a calibrated threshold for a calibrated amount of time.

OBDII Code P20FB RAM - Reductant Pump 2 Control Performance - AutoCodes.com — P20FB RAM Code - Reductant Pump 2 Control Performance

What does this mean?

What are the Possible Causes of the DTC P20FB RAM?

Faulty Diesel Exhaust Fluid (DEF) Pump
Diesel Exhaust Fluid Pump harness is open or shorted
Diesel Exhaust Fluid Pump circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P20FB RAM?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P20FB RAM code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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.

Frequently Asked Questions about P20FB RAM Code

1. What does the OBDII code P20FB mean on a RAM vehicle?

P20FB indicates an issue with the performance of the Reductant Pump 2 Control, which is a component of the diesel exhaust fluid (DEF) system responsible for reducing emissions.

2. What are common symptoms of the P20FB code on a RAM truck?

Symptoms may include a check engine light, DEF system warnings, reduced engine performance, or the vehicle entering limp mode.

3. What causes the P20FB code to appear?

Common causes include a faulty reductant pump, electrical issues like damaged wiring or connectors, a malfunctioning control module, or contamination in the DEF system.

4. Can I drive my RAM truck with the P20FB code active?

Driving with the P20FB code is not recommended, as it may lead to reduced engine performance or emissions system failures. Addressing the issue promptly helps avoid further damage.

5. How do I diagnose the P20FB code on my RAM vehicle?

Diagnosis typically involves using an OBDII scanner to confirm the code, visually inspecting the reductant pump and wiring, checking for module communication errors, and testing the pump's electrical performance.

6. How can I fix the P20FB code on a RAM truck?

Repairs may involve replacing the reductant pump, repairing damaged wiring or connectors, cleaning the DEF system, or reprogramming or replacing the control module.

7. Is the P20FB code covered under warranty on RAM trucks?

This depends on your specific vehicle's warranty terms. Emissions-related components may be covered under federal emissions warranties. Check with your dealer for details.

8. What is the Reductant Pump 2 in the DEF system?

The Reductant Pump 2 is responsible for delivering DEF fluid to the selective catalytic reduction (SCR) system, which reduces nitrogen oxide (NOx) emissions.

9. Can a contaminated DEF tank trigger the P20FB code?

Yes, contamination in the DEF tank can lead to pump or injector malfunctions, which may trigger the P20FB code.

10. What tools are needed to troubleshoot the P20FB code?

You'll need an OBDII scanner, a multimeter to test electrical connections, and possibly diagnostic software specific to RAM vehicles to assess the reductant system.