AutoCodes – Cadillac – P0B42 Cadillac

P0B42 Cadillac Code - Hybrid/Electric Vehicle Battery 2 Circuit Low 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: P0B42 Cadillac indicates Hybrid/Electric Vehicle Battery 2 Circuit Low 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 998

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 P0B42 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 P0B42 Cadillac - Hybrid/Electric Vehicle Battery 2 Circuit Low Voltage - AutoCodes.com — P0B42 Cadillac Code - Hybrid/Electric Vehicle Battery 2 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0B42 Cadillac?

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

How to Fix the DTC P0B42 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 P0B42 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 P0B42 Cadillac Code

1. What are the common symptoms of OBDII code P0B42 in a Cadillac hybrid/electric vehicle?

- Common symptoms include a decrease in fuel efficiency, reduced power output, and potential issues with starting the vehicle.

2. What are the possible causes of the Hybrid/Electric Vehicle Battery 2 Circuit Low Voltage code (P0B42) in a Cadillac?

- Possible causes include a failing hybrid/electric vehicle battery, loose or corroded battery connections, or issues with the battery management system.

3. How can I diagnose the OBDII code P0B42 in my Cadillac hybrid/electric vehicle?

- Diagnosis typically involves using a diagnostic scanner to retrieve the specific code, checking the battery connections for tightness and corrosion, and testing the hybrid/electric vehicle battery for proper voltage.

4. Can I continue driving my Cadillac if the P0B42 code is present?

- It is not recommended to continue driving the vehicle with this code present, as it can lead to further damage to the hybrid/electric system and potentially leave you stranded.

5. How can I repair the Hybrid/Electric Vehicle Battery 2 Circuit Low Voltage code in my Cadillac?

- Repair options may include replacing the hybrid/electric vehicle battery, repairing or replacing faulty connections, or recalibrating the battery management system.

6. Are there any DIY tips for troubleshooting the P0B42 code in my Cadillac?

- While some basic checks like inspecting battery connections can be done by DIY enthusiasts, diagnosing and repairing issues related to the hybrid/electric system may require specialized tools and expertise.

7. Is it safe to reset the OBDII code P0B42 in my Cadillac without addressing the underlying issue?

- Resetting the code without addressing the root cause can temporarily clear the warning light, but the issue may persist and potentially lead to more severe problems down the line.

8. Will driving my Cadillac with the P0B42 code affect the overall performance of the vehicle?

- Driving with this code can impact the vehicle's performance, fuel efficiency, and potentially lead to further damage to the hybrid/electric system if left unresolved.

9. How much does it typically cost to repair the Hybrid/Electric Vehicle Battery 2 Circuit Low Voltage code in a Cadillac?

- The cost of repair can vary depending on the specific issue, but it may range from a few hundred to several thousand dollars, especially if the hybrid/electric vehicle battery needs replacement.

10. Can the OBDII code P0B42 be intermittent in nature, causing the warning light to come and go?

- Yes, intermittent issues with the hybrid/electric system can sometimes trigger the P0B42 code sporadically, making it important to address the underlying problem even if the warning light turns off temporarily.