Error Code P20BC: What It Means & What To Do?

Want to learn something more about the P20BC fault code? This trouble code is generic, which would mean that it can apply to all the vehicles which are equipped with the OBD-II or the vehicles which are made since 1996 up to the present. The specifications on the definition, the troubleshooting steps as well as repairs can always vary from one vehicle make to another. The reductant heater A control circuit is being monitored by the engine control module. This trouble code would be set by the ECM when the reductant heater A control circuit voltage would not be as per the specifications set by the manufacturer.

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

• There can be inoperative reductant heater
• Flaws in the reductant temperature sensor
• There can be opened or shorted wiring in the reductant heater control circuit
• Some issues related to the SCR controller /PCM or programming error

1. Engine Control Module - Want to know the most common reason behind the failure in the engine control module? Corrosion or damage because of moisture can cause ECM failure. Corrosion might enter the ECM through the wiring harness and moisture can enter by a failure in the seals in the ECM itself.
2. Diesel Exhaust Fluid Pump - The diesel exhaust fluid pump needs to work properly if the transmission system has to perform. If it is not functioning, the transmission may slip and cause harsh shifts too. Thus replace faulty pump now and buy a new one from us!
3. Powertrain Control Module - The PCM makes the engine and transmission work in tandem. Any issue with the powertrain control module will cause major problems with the efficient running of the vehicle.
4. Exhaust Gas Recirculation Valve - Are you facing some engine performance issues? If there are some flaws in the EGR valve, then it would disrupt the automobile’s air fuel ratio which would ultimately cause engine performance problems like decrease in power, reduction in fuel efficiency as well as issues related to acceleration. Replace it as soon as possible.
5. Catalytic Converter - Catalytic converters at fault will lead to dropped fuel efficiency and performance along with increased emissions. Thus replace faulty parts now!
6. Engine Wiring Harness - Your car ECM would not operate properly if there are some cracks or break in the engine wiring harness. Corrosion as well as physical damage are the most common reasons why you should replace an engine wiring harness. Purchase high grade engine wiring harness online from Parts Avatar Canada.
7. Automatic Transmission Module - Faulty transmission module can cause problematic down shifts and upshifts, leading to stalling while accelerating or slowing down. This can also hamper many transmission system parts. Thus replace it now!
8. Diagnostic Tool - In order to fix these errors, you need few diagnostic tools to get your car problems pointed out easily. Our diagnostic tools collection will come handy to do so and resolve all your vehicle problems. Visit today!
9. Electronic Control Unit - If your vehicle fails to start for no apparent reason, this is also a good indicator that there can be some issues with the ECU. If you check the car battery, starter and other common electrical components, and the vehicle still does not start, a quirky electronic control unit should be the next logical thing to consider.

You might be thinking that how would you diagnose these problems? We at Parts Avatar Canada would help you diagnose the major symptoms easily.

Common Symptoms

• The overall engine performance might start declining
• Decrease in the fuel efficiency
• A lot of black smoke might start coming out from vehicle exhaust
• Some SCR related codes might appear

The repairs which you will have to do to correct this fault code are simply straightforward; you can surely pinpoint the necessary repairs on the basis of your diagnosis. Have a look at some common fixes:

• Reductant heater control circuit sensor replacement
• Reductant heater control sensor reprogramming
• PCM repair and reprogramming
• Faulty wiring and harness repair or replacement
• You must fix the defective reductant heater control sensor harness
• Make sure to mend the faulty reductant heater control circuit

There is no need to get strained if your OBD Code is still flashing up as we are here at your service. Have a look at our superior variety of catalytic converter, spark plug, pcm, ecm, egr, def fluid, glow plug, oil pressure sensor, body control module, pcm car, powertrain control module, ecm car, engine control module, ecm module, pcm module, glow plug relay, engine control unit and many more. Now all your problems would vanish within no time.

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

• Take the help of an experienced mechanic who will visually inspect the reductant heater system harnesses and connectors.
• Find and freeze frame data with the code. Then, clear the code and take the vehicle on a test drive under the same conditions.
• If the code reappears, perform a visual inspection of the components and its wiring.
• If the wiring is okay, the injector itself will be tested to confirm operation.
• The mechanic will repair or replace faults in relation to the reductant heater system, and EAS fuel pumps. Also check the power supply to the reductant heater system.
• Check for the voltage output from the reductant heater system and if it isn’t under the desired range, suspect it to be fault and might need replacement.
• If there is no problem found, check for the faulty ECU. Although, this fault is very rare but can be a reason for problematic exhaust system, thus hampering the engine performance. The ECU needs to be replaced in such condition and has to be reprogrammed to erase any stored faulty error.

Common Mistakes When Diagnosing The P20BC Code

• There can be some faults in the glow plug control module
• Negligence in the reductant tank heater
• Wiring problems