AutoCodes – Cadillac – P1B7A Cadillac

P1B7A Cadillac Code - Hybrid/Electric Vehicle Battery 50 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: P1B7A Cadillac indicates Hybrid/Electric Vehicle Battery 50 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 857

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 P1B7A 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 P1B7A Cadillac - Hybrid/Electric Vehicle Battery 50 Circuit High Voltage - AutoCodes.com — P1B7A Cadillac Code - Hybrid/Electric Vehicle Battery 50 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B7A Cadillac?

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

How to Fix the DTC P1B7A 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 P1B7A 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 P1B7A Cadillac Code

1. What does the OBDII code P1B7A mean on a Cadillac?

The P1B7A code indicates a fault in the Hybrid/Electric Vehicle Battery 50 circuit, specifically detecting a high voltage condition.

2. What are common symptoms of the P1B7A code in a Cadillac?

Symptoms may include a check engine light or hybrid system warning, reduced fuel efficiency, diminished electric motor performance, or the vehicle entering limp mode.

3. What causes the P1B7A code to appear on a Cadillac?

Common causes include a malfunctioning hybrid battery module, damaged wiring, corroded connectors, or a faulty battery voltage sensor.

4. Can I drive my Cadillac with the P1B7A code active?

Itâ€™s not recommended to drive with this code active, as it may lead to further damage in the hybrid system or reduced performance.

5. How is the P1B7A code diagnosed on a Cadillac?

Technicians typically use a scan tool to read the code, inspect the hybrid battery circuit for wiring or connector issues, and test the battery voltage sensor for faults.

6. What repairs are needed to fix the P1B7A code on a Cadillac?

Repairs may include replacing a damaged hybrid battery module, repairing or replacing wiring and connectors, or replacing the battery voltage sensor.

7. Is the P1B7A code specific to Cadillacs?

While the code P1B7A applies to certain hybrid or electric Cadillacs, it may also appear on other GM vehicles with similar hybrid systems.

8. What tools are required to repair the P1B7A code?

Diagnosing and repairing the code typically requires an advanced OBDII scan tool, a multimeter for testing electrical components, and access to the vehicle's wiring diagrams.

9. How much does it cost to fix a P1B7A code on a Cadillac?

The repair cost can vary widely, ranging from $200 to over $2,000, depending on whether the issue is with wiring, sensors, or the hybrid battery itself.

10. Can a P1B7A code be caused by software issues in a Cadillac?

Yes, in some cases, a software update for the hybrid system's control module may resolve the issue if itâ€™s caused by incorrect system calibration.