AutoCodes – Generic – P20FB

P20FB 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 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 3,353

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

What does this mean?

What are the Possible Causes of the DTC P20FB?

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?

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 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.

Need more information about the P20FB code?

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Information for Specific Makes

P20FB Dodge — Reductant Pump 2 Control Performance
P20FB RAM — Reductant Pump 2 Control Performance

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.