AutoCodes – Generic – P205F

P205F Code - Reductant System Performance Bank 2

Quick Answer

The Selective Catalytic Reduction (SCR) system reduces oxides of nitrogen (NOx) emissions by injecting a metered amount of Diesel Exhaust Fluid (DEF) or reductant into the exhaust gas stream entering the SCR catalyst. Common causes include Faulty Emission Reduction Fluid Injector, Emission Reduction Fluid Injector harness is open or shorted, Emission Reduction Fluid Injector 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: P205F indicates Reductant System Performance Bank 2.
Common causes: Common causes include Faulty Emission Reduction Fluid Injector, Emission Reduction Fluid Injector harness is open or shorted, Emission Reduction Fluid Injector 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 7,551

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 Mar 21, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P205F Description

The Selective Catalytic Reduction (SCR) system reduces oxides of nitrogen (NOx) emissions by injecting a metered amount of Diesel Exhaust Fluid (DEF) or reductant into the exhaust gas stream entering the SCR catalyst. Within the SCR catalyst, the DEF reacts with the NOx to form nitrogen, carbon dioxide, and water vapor. Upstream and downstream NOx sensors provide the Engine Control Module (ECM) with engine-out and tailpipe-out NOx levels. The ECM varies the amount of DEF added by varying the reductant injector duty cycle in response to changes in engine-out NOx levels.
The ECM supplies system voltage to the reductant pump motor. The ECM controls the solenoid by grounding the control circuit with a solid-state device called a driver. The driver is equipped with a feedback circuit that is pulled up to a voltage. The ECM can determine if the control circuit is open, shorted to ground, or shorted to a voltage by monitoring the feedback voltage. The ECM supplies a ground to the low reference circuit. As the duty cycle increases, the output of the reductant pump increases.
The ECM detects the reductant pressure did not reach a calibrated pressure after an initial attempt to build up pressure. The ECM will then reduce reductant pressure and then attempt to build pressure again. If the ECM detects reductant pressure is still less than a calibrated threshold, a Diagnostic Trouble Code (DTC) is set.

OBDII Code P205F - Reductant System Performance Bank 2 - AutoCodes.com — P205F Code - Reductant System Performance Bank 2

What does this mean?

What are the Possible Causes of the DTC P205F?

Faulty Emission Reduction Fluid Injector
Emission Reduction Fluid Injector harness is open or shorted
Emission Reduction Fluid Injector circuit poor electrical connection
Faulty Reductant Pump Motor

How to Fix the DTC P205F?

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 P205F 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 P205F code?

Need more information on how to fix the P205F code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P205F code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P205F Buick — Reductant System Performance Bank 2
P205F Cadillac — Reductant System Performance Bank 2
P205F Chevrolet — Reductant System Performance Bank 2
P205F Dodge — Reductant System Performance Bank 2
P205F Ford — Reductant System Performance Bank 2
P205F GMC — Reductant System Performance Bank 2

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.