P205F - OBD Trouble Code

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The prime symptom of the OBD code P205F is the increased emissions in the exhaust system. This not only increases pollutant emissions, but will also hamper the performance of the vehicle with affected utilization of the fuel delivery system. If the reductant system performance is out of bounds, OBD code P205F gets stored in the PCM.

Selective Catalytic Reduction (SCR) is an advanced active emissions control technology system that injects a liquid-reductant agent through a special catalyst into the exhaust stream of a diesel engine. The reductant source is usually automotive-grade urea, otherwise known as Diesel Exhaust Fluid (DEF). The DEF sets off a chemical reaction that converts nitrogen oxides into nitrogen, water and tiny amounts of carbon dioxide (CO2), natural components of the air we breathe, which is then expelled through the vehicle tailpipe.

SCR technology is designed to permit nitrogen oxide (NOx) reduction reactions to take place in an oxidizing atmosphere. It is called "selective" because it reduces levels of NOx using ammonia as a reductant within a catalyst system. The chemical reaction is known as "reduction" where the DEF is the reducing agent that reacts with NOx to convert the pollutants into nitrogen, water and tiny amounts of CO2. The DEF can be rapidly broken down to produce the oxidizing ammonia in the exhaust stream. SCR technology alone can achieve NOx reductions up to 90 percent.

What causes this problem with the Reductant System Performance Bank 2?

• Faulty reductant pressure sensor
• Bad reductant system injector
• Wrong or less DEF levels
• Open or shorted circuits in the reductant system
• SCR controller/PCM or programming issue

1. Engine Control Module – Most of the time it is difficult to intercept the ECM faults and thus must be checked for thoroughly. There can be a problem with the circuit or the software might have malfunctioned. Thus repair, replace or reprogram the component as per requirement.
2. Powertrain Control Module – If the PCM is faulty, it can stores wrong OBD codes and can lead to misdiagnosis. This can happen due to misinterpretation of data received from the various sensors and components which also affects the vehicle’s performance. Thus replace it immediately.
3. Diagnostic Tools – Use factory grade diagnostic tools to resolve OBD code P205F error. Buy new diagnostic tools and equipment for us.
4. Diesel Particulate Filter – The diesel particulate filter acts as an important component in managing the particulate emission in the exhaust system. If the filter is damaged, it may lead to increased emissions and pollutants through the tailpipe. Thus, replace damaged filter now!
5. Diesel Exhaust Fluid Heater – If the diesel exhaust fluid heater is faulty, it will not be able to aid in conversion of harmful nitrous oxide compounds to nitrogen, carbon dioxide and water vapours to control emissions. Thus, replace it immediately.
6. Exhaust System - Your exhaust system begins at the engine with the purpose of removing toxic gases and fumes from your vehicle. The components are a series of pipes, catalytic converters, sensors, mufflers, and often a resonator, as well as other emission devices. Thus, replace damaged exhaust system now!

Willing to know some common symptoms of OBD Code P205F? Your wish is our demand. Have a look at them below:

Common Symptoms

• Reduction in fuel efficiency
• Excessive black smoke from vehicle exhaust
• Diminished engine performance
• Other SCR related codes

We have listed out so ways which would help you to correct the occurrence of OBD Code P205F. They are mentioned here as follows:

• Diesel Exhaust Fluid Heater replacement
• Diesel Particulate Filter replacement
• Exhaust System replacement
• Faulty Reductant Injection valve replacement
• Faulty wiring and connector issue
• PCM repair and reprogramming

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The code is related to P205F, P2060, P2061.

Here are some steps which you should follow in order to diagnose this fault code:

• Hook up a scan tool to the DLC port and check for any codes present.
• Note the codes and freeze frame data from all the codes.
• Clear the stored codes from the ECU.
• Perform a road test under similar conditions as the freeze frame data indicated.
• Check that the P205F is the code that has come back after the test drive.
• A visual inspection will be done looking for signs of exhaust leaks or damaged wiring for either the sensor itself of the harness.
• Using a multimeter, the OHMs will be checked to the exhaust gas temperature sensor.
• The vehicle will be ran and the presence of exhaust leaks will be checked.

Common Mistakes When Diagnosing the P205F Code

• Faulty Powertrain Control Module (PCM)
• Failed Reductant Injection valve
• Failed Reductant control system
• Damaged DEF tank
• Faulty tank pressure sensor
• Faulty reductant tank temperature sensors
• Wiring harness and connector issue