Guide To P0BB5 OBD Error Code Solutions

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The trouble code P0BB5 can be elucidated as Hybrid Battery Voltage Sense “Y” Circuit Low. Plenty of mini-batteries connected together constitute the high voltage control module. Whenever there is an error detected by the high voltage control module within the battery packs that are present in the high voltage battery assembly, the error code P0BB5 is stored by the high voltage control module.

Generally, the composition of the hybrid/electric vehicle battery pack includes 288 cells. Sets of three cells are all soldered together in uniformity. Also, the total number of 96 cell groups can be found in the hybrid/EV battery pack assembly. Linked together, all these cell groups are connected through an electrical connection in-series. The individual cell group is often rated at 3.7 V for a nominal system voltage of 355 V direct current. All these battery sections can be observed to be further sectioned into three. The battery section one is composed of first 90 cells/30 cell groups. One can note this section located close to the cowl consisting of batteries changing from 67 to 96. The battery section one is located in front of the battery section two. This section consists of 72 cells/24 cell groups each containing batteries from 43 to 66. The section number three is the transverse battery section, which comprises of the remaining 126 cells/42 cell groups and includes batteries 1 to 42. All these three battery sections can be serviced well individually. It can be seen that the battery energy control module from time to time controls the voltage of the 96 battery cell groups with the help of the four hybrid/EV battery interface control modules. The voltage sense circuits are associated to each individual cell group and these sense circuits end at a connector built on the top surface of the battery section. Also found on the top surface of the battery section, a serviceable auxiliary battery wiring harness fixes this connector to a hybrid/EV battery interface control module. The hybrid/EV battery interface control module plays the role of constantly codifying the voltage reading and sending it forward to the battery energy control module through the battery control harness. On battery sections one and two, there is one hybrid/EV battery interface control module built. Two hybrid/EV battery interface control modules are linked with battery section three. All these components including the hybrid/EV battery interface control module, battery energy control module wiring harness, auxiliary battery wiring harness, and battery energy control module can be seen serviceable parts. The function of detecting a fault condition is performed by the battery energy control module. Using serial data, diagnostics and system status are transmitted from the battery energy control module to hybrid/EV powertrain control module 2. The hybrid/EV powertrain control module considered to be the main controller for diagnostic trouble code information.

What causes this problem with the Hybrid Battery Voltage Sense “Y” Circuit Low?

• Faulty hybrid/electric vehicle battery pack
• There can be inoperative hybrid/electric vehicle battery interface control module

1. Diagnostic Tools - Use factory grade diagnostic tools to resolve OBD code P0BB5 error. Buy new diagnostic tools and equipment for us.
2. 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.
3. Powertrain Control Module - If the PCM is faulty, it can store 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. Hybrid Battery - The hybrid battery is the heart of the drive motor and all the vehicle functions depend on it. Thus, if the battery is not charging, overcharging or discharging, it must be replaced to avoid any further damage to various parts of the car.
5. Electronic Control Unit - The ECU power management control module keeps in check the hybrid battery charging functions. If the ECU is faulty, the battery pack will not be able to properly get charged and thus, the ECU might need replacement.

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 service engine soon light can start lighting up

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:

• Repair or replace the quirky hybrid/electric vehicle battery interface control module
• The malfunctioning hybrid/electric vehicle battery pack should be repaired or replaced as per the need
• Recondition the non-functioning ECM

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

• 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.
• Most often he has to inspect the solenoid itself to see if they are faulty or damaged. Additional error codes that are stored in the vehicle are also addressed.
• The mechanic performs a continuity test between the PCM and solenoid to check the resistance.
• If the solenoid or the control modules are not faulty, he will then retune the code and test drive the vehicle.
• On test driving, if the P0BB5 code does not return soon, he will know that an erratic condition exits.
• But if the error returns instantaneously, he will check every component of the control module as well as the circuit like connectors, wires, harness, fuses etc for any possible fault.
• If any component is damaged, he will fix them right away.
• After performing this repair, he will inspect the Hybrid Battery Voltage Sense “Y” Circuit as well.
• If there are some faults in the hybrid battery voltage isolation sensor circuit, then it needs to be replaced.
• Every time a repair work is carried out, make sure that the mechanic test drives the vehicle after every repair so that the diagnosis is successful. This can eventually help him to know as to where the error occurred.

Common Mistakes When Diagnosing The P0BB5 Code

• There can be some faults in the high voltage battery connection
• High voltage battery assembly problems
• Wiring might be faulty