AutoCodes – Cadillac – P1B72 Cadillac

P1B72 Cadillac Code - Hybrid/Electric Vehicle Battery 48 Circuit Performance

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: P1B72 Cadillac indicates Hybrid/Electric Vehicle Battery 48 Circuit Performance.
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 842

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 P1B72 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 P1B72 Cadillac - Hybrid/Electric Vehicle Battery 48 Circuit Performance - AutoCodes.com — P1B72 Cadillac Code - Hybrid/Electric Vehicle Battery 48 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1B72 Cadillac?

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

How to Fix the DTC P1B72 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 P1B72 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 P1B72 Cadillac Code

1. What are the common symptoms of OBDII code P1B72 Cadillac Hybrid/Electric Vehicle Battery 48 Circuit Performance?

- Common symptoms include reduced hybrid system performance, decreased fuel efficiency, and potential illumination of the check engine light.

2. What are the possible causes of OBDII code P1B72 in a Cadillac hybrid or electric vehicle?

- Potential causes may include issues with the hybrid/electric vehicle battery, faulty wiring or connections, software glitches, or problems with the battery management system.

3. How can I diagnose OBDII code P1B72 in my Cadillac hybrid or electric vehicle?

- Diagnosing this code typically requires specialized diagnostic equipment to check the hybrid/electric vehicle battery, wiring, and related components for any faults or abnormalities.

4. Can I continue driving my Cadillac with OBDII code P1B72 present?

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

5. How can I reset OBDII code P1B72 in my Cadillac hybrid or electric vehicle?

- Resetting this code typically involves using a diagnostic scanner to clear the code after addressing the underlying issue causing the fault.

6. Are there any DIY repair tips for fixing OBDII code P1B72 in a Cadillac hybrid or electric vehicle?

- DIY repairs for this code are generally not recommended due to the complexity of the hybrid/electric system. It is best to seek professional assistance for proper diagnosis and repair.

7. How much does it cost to repair OBDII code P1B72 in a Cadillac hybrid or electric vehicle?

- Repair costs can vary depending on the underlying issue causing the code. It is recommended to consult a professional technician for an accurate diagnosis and cost estimate.

8. Can a faulty battery be the sole reason for OBDII code P1B72 in a Cadillac hybrid or electric vehicle?

- While a faulty battery can be a common cause of this code, there may be other contributing factors such as wiring issues, software malfunctions, or problems with the battery management system.

9. Is OBDII code P1B72 specific to Cadillac vehicles only?

- OBDII code P1B72 related to Hybrid/Electric Vehicle Battery 48 Circuit Performance is specific to Cadillac hybrid or electric vehicles and may not apply to other vehicle makes or models.

10. How can regular maintenance help prevent OBDII code P1B72 from appearing in a Cadillac hybrid or electric vehicle?

- Regular maintenance, including scheduled inspections of the hybrid/electric system components, can help detect potential issues early on and prevent the occurrence of OBDII code P1B72.