Error Code P0B21: What It Means & What To Do?

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Is the Check Engine Light illuminated on the instrument panel of your car? Does your car consume all it’s fuel quicker than before? Is it having troubles with engine vacuum and with engine performance? If your answer is “YES” then there is a possibility that your vehicle is indicating a fault with hybrid battery pack voltage sense “D” Circuit being high. In order to have deeper knowledge of this error code P0B21, you will need to go through our following sections.

Eager to know more about this error code P0B21? Well, this is an error code that will be set by the ECM/PCM when there is high voltage problem with the high voltage battery pack sense “D” Circuit, i.e. the powertrain control module is not getting the required amount of signals from the hybrid battery pack for “D” circuit. We highly recommend you to get this problem diagnosed and fixed at the earliest. To know about few of its common causes, have a look at the section below.

What causes this problem with the Hybrid Battery Pack Voltage Sense "D" Circuit High?

• Unlocked or shorted hybrid battery pack harness
• Problematic hybrid battery pack
• Unsatisfactory electrical connection in the hybrid battery pack circuit

1. Hybrid Battery Pack - If everything is alright with ECM/PCM and you still P0B21 flashing, then there is surely some defects with the Hybrid Battery Pack. Get it diagnosed and replaced before the situation gets worse.
2. Hybrid Battery Voltage Sensor - If you need hybrid battery voltage sensor to fix your car then we have a good news for you. We have in stock not only high end hybrid battery voltage sensor but we also have them for all makes and models. So what are you waiting for? Just dive into the pool of best auto parts today.
3. Battery Cable - A faulty Car Battery Cable can be troublesome. You can always rely on us as we have best auto parts for our customers.
4. Battery Contactor Assembly - Defective battery contractor assembly can cause a lot of difficulties, so why not get it replaced at time? Buy new ones with us at PartsAvatar today.
5. Battery Control Module - OBD error code P0B21 flashing? There is a chance that your vehicle’s battery control module component (BCM) is damaged and is demanding for a quick change. So what are you waiting for? Buy a new one with us now.
6. Engine Control Module - Do you remember when was the last time you got your car’s ECM checked? A faulty engine control module can cause a lot of issues like displaying P0B21 code.
7. Powertrain Control Module - Are there some faults in your car’s Powertrain Control Module? Don’t waste time and get them replaced or else P0B21 code can turn up.

It is vital to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0B21 here:

Common Symptoms

• Check engine light might come into signal
• Fall in fuel economy
• Troubles with engine vacuum
• Problematic acceleration

Want to correct the Trouble Code P0B21? Read these points mentioned below:

• Make sure to restore the faulty hybrid battery
• Repair or replace the bad hybrid battery pack circuit “D”
• Carefully adjust the faults in the hybrid battery pack switch
• The hybrid battery cut off switch harness should be restored to working order
• It is highly essential to perform proper service of the unsound battery current sensor
• Also, repair or replace the faulty engine control modules and car pcm’s if found faulty

Parts Avatar Canada is here to solve all your issues related to car parts. We have stocked a wide range of best priced Hybrid Battery Pack, Hybrid Battery Voltage Sensor, Battery Energy Control Module, Battery Cable, Battery Connector Assembly, Battery Control Module, Engine Control Module, Powertrain Control Module and a lot more to help you out in fixing your car.

If you want to easily diagnose this trouble code, then you must follow the steps which are mentioned here as below:

• A careful inspection of the vehicle is carried out by the mechanic with the help of a scanner.
• After this inspection, he will recover every stored codes in the vehicle as well as freeze frame data by inserting a scanner to the diagnostic port of the vehicle.
• He will store this information as it may help him with further diagnosis.
• After the codes are recovered, the vehicle is reset, test- driven to check for the occurrence of the error code.
• He will clearly know that an erratic condition has prevailed if the code does not return quickly.
• After this, the technician will visually inspect every wires, connectors, harness and fuses for any possible damages or defective and repairs them as needed.
• You must always know that once the error code is repaired, it is always the best idea to test drive and check the vehicle if the error code appears again which can help the technician to know the area of fault and as to how the error code occurred in the vehicle.
• This can easily help the mechanic to fix the error code.

Common Mistakes When Diagnosing The P0B21 Code

Conducting a diagnosis is not as easy as it might seem, even the top notch mechanic can commit few errors. To avoid any of these misdiagnosis you need to follow the diagnostic steps with precision. Make sure you check each and every part related to OBD error code P0B21 to make sure you are diagnosing the problem effectively, and there occurs no misdiagnosis. There might occur the following errors

• Battery contactor assembly might start failing
• Some issues related to the battery energy control module