P20BB - OBD Trouble Code

The engine control module, powertrain control module or the transmission control module monitors this circuit depending upon the particular automobile. Is the check engine light illuminating on the dashboard? Are you experiencing reduced engine performance along with affected fuel economy? Is there black smoke emitting from the exhaust pipe? All these are the indications of increased emissions and affected exhaust system which in this case can be due to bad reductant heater A control circuit, thus causing OBD code P20BB to get stored in the powertrain control module.

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

• Malfunctioning reductant heater
• Faulty reductant temperature sensor
• Reductant heater control harness might be open or little  
• Substandard electrical connection in the reductant heater control circuit
• Quirks in the SCR controller /PCM or programming error

1. 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!
2. Engine Control Module - ECM faults are rare but can be a big problem as faulty ECM will cause wrong vehicle operations and can also result in wrong OBD codes getting stored in the system which can also cause misdiagnosis. Thus, replace faulty ECM components now!
3. Powertrain Control Module - Check for PCM error which might be due to circuit faults that might require complete replacement and reprogramming. Replace it now!
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5. Diesel Exhaust Fluid Pump - If the DEF pump will not function properly, it can cause increased emissions in the exhaust system and reduced the longevity of the filtration elements in the exhaust system. Thus, replace faulty pump immediately.
6. Exhaust Gas Recirculation Valve - Bad EGR valve can cause many performance issues. Common signs include engine performance issues like decreased power and acceleration, rough idle, and the Check Engine Light coming on. Thus, replace faulty EGR valve now!
7. Fuel Injection - This system is responsible for supplying fuel with certain pressure, thus assisting the fuel delivery system and engine combustion process. Replace faulty/damaged injectors now!
8. Engine Wiring Harness - Damaged, broken or corroded wiring can cause the fuel delivery system to fail and the components to not work properly. These are easier to check and replace. Purchase new wiring harness and replace the faulty one.

Willing to know some common symptoms of OBD Trouble Code P20BB? Your wish is our demand. Have a look at them below:

Common Symptoms

• Decrease in the engine performance
• A lot of black smoke from vehicle exhaust
• There might be reduction in fuel efficiency
• Other SCR associated codes

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P20BB:

• Repair or replace the quirky reductant heater control circuit
• Rehabilitate the defaults in the reductant heater control circuit harness
• Reductant heater control circuit replacement
• Make sure to restore reductant heater control sensor
• Circuit wiring and connector replacement
• EAS controller and PCM reprogramming should be done

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If you want to easily diagnose this fault code, then all you have to do is to follow the steps which are mentioned below:

• Check for SCR controller code error that might also get stored in the PCM along with this code, which can solve the problem easily.
• Inspect the reductant heater for any corrosion or leakages on the exterior and if found, suspect it to be failed.
• One will require tools like a diagnostic scanner, digital volt/ohmmeter, and automotiveauto motive stethoscope.
• Connect the OBD scanner and retrieve the entire coded and freeze frame the data. After doing that test run the vehicle again under same circumstances to see if the code returns to make sure which codes are persistent (in case of more than one code).
• Check for damaged, broken and corroded wiring and connector to the sensor circuit and replace them, if required.
• Use the DVOM to test for voltage from the reductant heater system harnesses and check for fluctuations. If the readings are not under specified range, suspect for reductant heater system failure and replace it immediately.
• If everything seems to work fine, then check for faulty PCM and replace or reprogram as required.

Common Mistakes When Diagnosing The P20BB Code

• Some issues related to the glow plug control module
• Failure in the reductant tank heater
• Issues related to the wiring