P20BF - OBD Trouble Code

If the engine control module would detect a variation in the voltage coming from the reductant heater B control circuit that is outside the parameters set by the automobile manufacturer, then it would store the P20BF error code. This would also give rise to the illumination of the check engine light.

What causes this problem with the Reductant Heater B Control Circuit Low?

• Some issues related to the reductant heater
• Malfunctioning reductant temperature sensor
• Unlocked wiring in the reductant heater control sensor circuit
• Unusable SCR controller /PCM or programming error

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. Exhaust Gas Recirculation Valve - It is auto part commonly found on many road going automobiles. It is a part of the vehicle’s exhaust gas recirculation (EGR) system, an emissions system that is designed to recirculate exhaust gases back into the vehicle’s intake so that it can reduce cylinder temperatures and NOx emissions. Purchase top notch exhaust gas recirculation valve from us at economical prices.
3. 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.
4. Diagnostic Tools - Use factory grade diagnostic tools to resolve OBD code P20BF error. Buy new diagnostic tools and equipment for us.
5. 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!
6. 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.
7. 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 devises. Thus, replace damaged exhaust system now!
8. Fuel Injection - Damaged, corroded, leaky or clogged fuel injector will restrict fuel entry into the chamber and thus cause lean condition, hampering the overall performance. Replace it now!

There could be countless symptoms which that would accompany with this fault code. Willing to know some common symptoms of OBD Trouble Code P20BF? Your wish is our demand. Have a look at them below:

Common Symptoms

• Check engine light might come into signal
• Diminishing fuel efficiency
• A lot of black smoke might start emitting from the automobile’s exhaust
• Declining engine performance
• Some SCR associated codes might also appear

Looking out for some ways with the help of which you can correct this fault code? Then you have arrived at the correct place. We are here to help you out, so you must check out the steps mentioned below as follows:

• You must fix the defective PCM or programming error
• It is essential to restore the flawed reductant heater control circuit
• Repair or replace the quirky reductant heater
• Adjust the flawed reductant heater control harness
• Make sure to mend faulty electrical connection
• It is essential to restore the flawed reductant heater control sensor
• Rehabilitate the defaults in the wiring harness
• Carefully adjust the leakage in the exhaust

Don’t get tensed if you are still facing any of these issues as we care for our customers and that’s why we offer a good range of pcm, ecm, diesel exhaust fluid, reductant heater, reductant temperature sensor, catalytic converter, ecm module, pcm module and a lot more. We are sure that now all your issues would be resolved. 

It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P20BF code to be stored:

• The mechanic or the technician will use a diagnostic scanner or code reader like DVOM to visually scan for the error codes in the vehicle.
• After performing a careful inspection, every of the stored codes and freeze frame data are retrieved as it can help down the way for further diagnosis process.
• Then the mechanic should visually inspect the faulty as well as damaged parts.
• After that the scan tool should be utilized to inspect the reductant heater system harnesses and the connectors. Repair or replace burnt or damaged wiring and or connectors before doing any further diagnosis.
• Plug the scanner into the vehicle diagnostic connector and retrieve all stored codes and pertinent freeze frame data. Note this information down before clearing the fault codes. Make the PCM to go into readiness mode or reset the code by test driving the vehicle.
• If the PCM enters readiness mode, the code is intermittent and will be difficult to diagnose. If the code gets reset immediately, start searching for the correct information source to get diagnostic flow charts, connector pin-out charts as well as constituent testing procedures and specifications.
• Test (voltage drop) the power supply to the SCR control system using a DVOM. Check fuses with the circuit loaded to avoid misdiagnosis.
• With the help of the scanner, activate the reductant heater and test output control circuit voltage, if the power battery voltage and ground circuit are discovered appropriately.
• There are chances that the controller is bad or has experienced a programming error, if the voltage is insufficient. If the voltage output circuit is within parameters, use the DVOM and test the SCR control system. If the heater does not meet manufacturer’s specifications, then it might have failed and shall be replaced.

Common Mistakes When Diagnosing The P20BF Code

• Malfunctioning glow plug control module
• There can be a failure in the reductant tank heater
• Wiring problems