P0BB2 - OBD Trouble Code

<<See All OBD Codes

The trouble code P0BB2 can be elucidated as Hybrid Battery Voltage Sense “X” Circuit Intermittent/Erratic. The hybrid/electric vehicle battery pack has a total of 96 cells in it. Also, sets of three cells are fused together in parallel. Overall 96 cell groups are present in the hybrid/EV battery pack assembly. All of these cell groups are connected using an electrical connection in-series. A single cell group is ranked at 3.7 V for a formal system voltage of 355 V direct current. These battery cells present are further also sectioned into three equal parts. The battery section one includes the first 90 cells/30 cell groups. This section is situated close to the cowl and consists of batteries from 67 to 96. In Front of the battery section two is the section one. Composed of 72 cells/24 cell groups it contains batteries numbering from 43 to 66. The transverse battery section is labeled as the battery section three. It consists of the rest of the 126 cells/42 cell groups and batteries ranging from 1 to 42. 

All the three battery sections are separately serviceable parts. Also, the task of regulating the voltage of the 96 battery cell groups through the four hybrid/EV battery interface control modules is performed by the battery energy control module. The voltage sense circuits can be observed linked to each individual cell group. At a connector situated on the top surface area of the battery section, one can see these voltage sense circuits terminating. An auxiliary battery wiring harness that can be serviced individually is used to link this connector to a hybrid/EV battery interface control module. This is also located on the top surface of the battery section. The hybrid/EV battery interface control module performs the essential function of encoding the voltage reading and further imparting it to the battery energy control module by the way of the battery control harness. In all, there is one hybrid/EV battery interface control module placed on the battery sections one and two while there are two hybrid/EV battery interface control modules connected to the battery section three. The parts namely the hybrid/EV battery interface control module, battery energy control module wiring harness, auxiliary battery wiring harness, and battery energy control module are all valid for servicing. The battery energy control module constantly updates whenever there is a fault present. Via serial data, diagnostics and system status are forwarded from the battery energy control module to hybrid/EV powertrain control module 2. The hybrid/EV powertrain control module 2 is considered to be the chief controller for all the diagnostic trouble code information. Numerous mini-batteries connected together embody the high voltage battery pack. Whenever the high voltage control module notifies an error with more than one battery packs that high voltage battery assembly is made of, the code P0BB2 is stored by the high voltage control module.

What causes this problem with the Hybrid Battery Voltage Sense “X” Circuit Intermittent/Erratic?

• Malfunctioning battery smart unit
• Unusable HV battery assembly

1. Engine Control Module - Dead cells in batteries can cause a failure in the engine control module. Many times a battery is left in the rig long after a cell has died. This would affect the grounding in the car battery.
2. Powertrain Control Module - If there are some faults in the PCM, then it may throw off the timing and fuel settings of the engine, which can negatively affect the performance. A flawed PCM may cause the vehicle to experience a reduction in fuel efficiency, power as well as acceleration. Buy high grade PCM online from us.
3. Electronic Control Unit - Do you know that the poor performance or unexplained drops in fuel economy or efficiency are often associated to onboard car computer problems, or defective ECU issues? It's better to replace it with a brand new one.
4. Hybrid Battery - Whenever the hybrid battery fails, one is likely to experience a fall in the MPG. Apart from this, a failure in the hybrid battery is likely to trigger symptoms that may lead to an unusual MPG. in addition to these the driver is likely to observe a high mileage. So, in order to prevent expensive repairs we recommend you to change the hybrid battery right away from Parts Avatar.
5. Battery Coolant Pump - Even if the temperature sensor is working properly, the battery coolant pump can be at fault and may need replacement. If the pump is not responding to the PCM requests, then the malfunctioned pump can cause overheating of the battery which in turn can affect the vehicle performance.
6. Coolant Hoses/Pipes - Damaged hoses and pipes can cause leakages and thus reduce the effectiveness of the cooling system. Thus, cracked and damaged pipes must be replaced immediately.
7. Cooling System - There can be many components in the cooling system that can be faulty, causing battery overheating and underperforming. So, replace the faulty components immediately.
8. Battery Temperature Sensor - If the temperature sensor is faulty, the ECU will not be able to calculate the battery temperatures and the battery can overheat or run cold. Thus, it is important that the temperature sensors work properly so that the ECU can control the blower fan to manage the temperatures. Buy new battery temperature sensors form us.

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

• Visibility in the check engine light

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:

• The malfunctioning battery smart unit should be repaired or replaced as per the need
• You must fix the defective HV battery assembly
• Rehabilitate the defaults in the powertrain control module

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 battery control module, hybrid battery, pcm, ecm, ecu, pcm module and ecm module 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:

• This is a general type of error code which is diagnosed with the help of a scanner.
• The mechanic will insert a scanner to diagnostic port of the vehicle and recover the codes and freeze frame data.
• If he happens to find any additional error codes, he has to address them as well.
• Once it is done, he has to reset the vehicle, and then test drive to see if the error code appears.
• If the error code does not return, then there can be an erratic condition.
• Then the mechanic has to check the wires, connectors and other electrical components and quickly replace them if he finds them to be damaged or defective.
• Check for the damaged Hybrid Battery Voltage Sense “X” Circuit and its components for error. It the mechanic finds the fault in the connectors in relation to the Hybrid Battery Voltage Sense “X” Circuit, replace it immediately.
• Also check for the particular battery cells emitting high voltages and thus might need battery replacement as well.
• Parts or components should not be replaced with reference to only a P0BB2 DTC. The vehicle service manual should be consulted for more information on possible causes of the fault, along with required testing.
• If all the components seem to work perfectly, inspect the PCM for faults and replacement along with reprogramming.

Common Mistakes When Diagnosing The P0BB2 Code

• High voltage battery connection might start failing
• Flaws in the high voltage battery assembly
• Issues with the wiring