AutoCodes – Cadillac – P1B7F Cadillac

P1B7F Cadillac Code - Hybrid/Electric Vehicle Battery 52 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: P1B7F Cadillac indicates Hybrid/Electric Vehicle Battery 52 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 851

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 12, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1B7F 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 P1B7F Cadillac - Hybrid/Electric Vehicle Battery 52 Circuit Low Voltage - AutoCodes.com — P1B7F Cadillac Code - Hybrid/Electric Vehicle Battery 52 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B7F Cadillac?

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

How to Fix the DTC P1B7F 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 P1B7F 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 P1B7F Cadillac Code

1. What does the OBDII code P1B7F mean on a Cadillac?

P1B7F indicates "Hybrid/Electric Vehicle Battery 52 Circuit Low Voltage," meaning there is an issue with the voltage in battery cell 52 of the hybrid or electric vehicle's battery pack.

2. What are the common symptoms of code P1B7F on a Cadillac?

Common symptoms include the hybrid system warning light, reduced fuel efficiency, limited electric-only driving range, or the vehicle entering limp mode.

3. What causes the P1B7F code to appear on a Cadillac?

The code is typically caused by a malfunction in the battery pack, a damaged battery cell, poor electrical connections, or a faulty battery management module.

4. Can I drive my Cadillac with the P1B7F code?

Driving with this code is not recommended as it can lead to reduced performance, potential damage to the battery pack, and safety concerns related to the hybrid system.

5. How do I diagnose the P1B7F code on a Cadillac?

Diagnosing this code involves using a scan tool to read data from the battery management system, inspecting the wiring and connectors, and testing the voltage of individual battery cells.

6. How do I fix the P1B7F code on a Cadillac?

Repairs may involve replacing a damaged battery cell, repairing wiring or connector issues, or recalibrating or replacing the battery management module.

7. How much does it cost to repair the P1B7F code on a Cadillac?

The cost can vary widely depending on the issue but may range from $200 to $5,000 or more, depending on whether a single cell or the entire battery pack needs replacement.

8. Can a faulty battery management module cause the P1B7F code?

Yes, a malfunctioning battery management module can misinterpret or fail to regulate battery voltage, triggering the P1B7F code.

9. Is the P1B7F code specific to Cadillac vehicles?

While the code is most commonly associated with Cadillac hybrid or electric models, similar codes may appear in other vehicles with hybrid or electric systems.

10. How can I prevent the P1B7F code from occurring on my Cadillac?

Regular maintenance of the hybrid system, avoiding extreme temperatures, and ensuring proper charging practices can help prevent issues with battery cells and the P1B7F code.