AutoCodes – Cadillac – P0B43 Cadillac

P0B43 Cadillac Code - Hybrid/Electric Vehicle Battery 2 Circuit High Voltage

Quick Answer

The Hybrid/Electric Vehicle battery pack contains 288 cells. Common causes include Faulty Hybrid/Electric Vehicle Battery Pack, Faulty Hybrid/Electric Vehicle Battery Interface Control Module. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0B43 Cadillac indicates Hybrid/Electric Vehicle Battery 2 Circuit High Voltage.
Common causes: Common causes include Faulty Hybrid/Electric Vehicle Battery Pack, Faulty Hybrid/Electric Vehicle Battery Interface Control Module.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 903

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 07, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0B43 Cadillac Description

The Hybrid/Electric Vehicle battery pack contains 288 cells. Groups of three cells are welded together in parallel. There are a total of 96 cell groups in the hybrid/EV battery pack assembly. These cell groups are electrically connected in-series. Each individual cell group is rated at 3.7 V, for a nominal system voltage of 355 V direct current. The battery cells are also grouped together into three sections. The first 90 cells/30 cell groups make up battery section one. This section is adjacent to the cowl and contains batteries 67 through to 96. Battery section two is located behind section one. It is made up of 72 cells/24 cell groups and contains batteries 43 through to 66. The transverse battery section is section number three, it is made up of the remaining 126 cells/42 cell groups and contains batteries 1 through to 42. The three battery sections are individually serviceable components.
The battery energy control module monitors the voltage of the 96 battery cell groups through the four hybrid/EV battery interface control modules. Voltage sense circuits are attached to each individual cell group, and these sense circuits terminate at a connector located on the top surface of the battery section. A serviceable auxiliary battery wiring harness joins this connector to a hybrid/EV battery interface control module, also located on the top surface of the battery section. The hybrid/EV battery interface control module encodes the voltage reading and transmits it to the battery energy control module through the battery control harness. There is one hybrid/EV battery interface control module located on battery sections one and two, and two hybrid/EV battery interface control modules associated with battery section three. The hybrid/EV battery interface control module, battery energy control module wiring harness, auxiliary battery wiring harness, and battery energy control module are all considered serviceable components.
The battery energy control module will determine when a fault condition is present. Diagnostics and system status are communicated from the battery energy control module to hybrid/EV powertrain control module 2 through serial data. The hybrid/EV powertrain control module 2 is the host controller for diagnostic trouble code information.

OBDII Code P0B43 Cadillac - Hybrid/Electric Vehicle Battery 2 Circuit High Voltage - AutoCodes.com — P0B43 Cadillac Code - Hybrid/Electric Vehicle Battery 2 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0B43 Cadillac?

Faulty Hybrid/Electric Vehicle Battery Pack
Faulty Hybrid/Electric Vehicle Battery Interface Control Module

How to Fix the DTC P0B43 Cadillac?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0B43 Cadillac code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0B43 Cadillac Code

1. What does the OBDII code P0B43 mean on a Cadillac?

The P0B43 code indicates a "Hybrid/Electric Vehicle Battery 2 Circuit High Voltage," meaning the vehicle has detected abnormally high voltage in the specified battery circuit.

2. What are the common symptoms of P0B43 in a Cadillac?

Symptoms may include a check engine light, reduced hybrid or electric performance, limited driving range, and, in some cases, the vehicle entering limp mode.

3. What causes the P0B43 code to appear?

The code can be triggered by issues such as a faulty battery module, damaged wiring or connectors in the battery circuit, a malfunctioning battery management system, or software errors.

4. Can I drive my Cadillac with the P0B43 code active?

It is not recommended to drive the vehicle as it may lead to further damage or reduced performance. Have the issue diagnosed and repaired promptly.

5. How can I diagnose the P0B43 code on my Cadillac?

Diagnosis typically involves scanning the vehicle with an advanced OBDII scanner, inspecting the battery circuit wiring and connectors, and testing the voltage levels of the affected battery module.

6. What are common fixes for the P0B43 code?

Repairs may include replacing the faulty battery module, repairing or replacing damaged wiring or connectors, updating the vehicleâ€™s software, or replacing the battery management system if needed.

7. How much does it cost to repair a P0B43 code on a Cadillac?

Repair costs can vary widely depending on the specific issue. Replacing a battery module can cost $500 to $2,000 or more, while wiring repairs may be less expensive.

8. Can a weak 12V battery cause the P0B43 code?

While unlikely, a weak 12V battery can sometimes cause issues in hybrid or electric vehicle systems, so itâ€™s worth checking and replacing the 12V battery if needed.

9. Does clearing the P0B43 code fix the problem?

Clearing the code may temporarily reset the warning, but it will not fix the underlying issue. Proper diagnosis and repair are necessary.

10. Is the P0B43 code covered under warranty for a Cadillac hybrid or electric vehicle?

Battery-related issues may be covered under the hybrid/electric vehicle warranty, depending on the vehicleâ€™s age and mileage. Check your warranty terms for details.