AutoCodes – Cadillac – P0B74 Cadillac

P0B74 Cadillac Code - Hybrid/Electric Vehicle Battery 12 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: P0B74 Cadillac indicates Hybrid/Electric Vehicle Battery 12 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 1,059

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 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0B74 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 P0B74 Cadillac - Hybrid/Electric Vehicle Battery 12 Circuit Low Voltage - AutoCodes.com — P0B74 Cadillac Code - Hybrid/Electric Vehicle Battery 12 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0B74 Cadillac?

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

How to Fix the DTC P0B74 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 P0B74 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 P0B74 Cadillac Code

1. What does the OBDII code P0B74 mean on a Cadillac?

P0B74 indicates that the hybrid or electric vehicle's battery 12 circuit is experiencing low voltage, often related to the battery management system.

2. What are the common symptoms of code P0B74 in a Cadillac?

Symptoms may include reduced fuel efficiency, limited hybrid or EV system performance, warning lights on the dashboard, or the vehicle failing to start.

3. What causes the P0B74 code to appear on a Cadillac?

The code can be triggered by issues such as a weak or damaged hybrid battery, corroded or loose electrical connections, a faulty battery management system, or wiring problems in the battery 12 circuit.

4. Can a bad 12-volt auxiliary battery cause the P0B74 code?

Yes, a failing 12-volt auxiliary battery can contribute to low voltage in the system and trigger the P0B74 code.

5. How can I diagnose the P0B74 code on my Cadillac?

Start by checking the battery voltage, inspecting the wiring and connectors for damage or corrosion, and testing the hybrid battery and battery management system using a professional diagnostic tool.

6. Can I drive my Cadillac with the P0B74 code present?

Itâ€™s not recommended to drive the vehicle as it may experience reduced performance, and ignoring the issue could lead to further damage to the hybrid system.

7. How much will it cost to fix the P0B74 code on a Cadillac?

Repair costs vary depending on the root cause, ranging from $100 for minor fixes like wiring repairs to several thousand dollars if the hybrid battery needs replacement.

8. Can a software update fix the P0B74 code on a Cadillac?

In some cases, a software update for the battery management system may resolve the issue, but this depends on the specific circumstances and diagnostic results.

9. What tools are needed to troubleshoot the P0B74 code?

Youâ€™ll need an advanced OBDII scanner capable of reading hybrid system codes, a multimeter to test voltage, and potentially a service manual for your Cadillac model.

10. What should I do if the P0B74 code reappears after repairs?

If the code reappears, recheck the wiring and connectors, ensure the battery management system is functioning correctly, and verify that all repairs were properly completed.