AutoCodes – Cadillac – P1B7C Cadillac

P1B7C Cadillac Code - Hybrid/Electric Vehicle Battery 51 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: P1B7C Cadillac indicates Hybrid/Electric Vehicle Battery 51 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 820

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1B7C 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 P1B7C Cadillac - Hybrid/Electric Vehicle Battery 51 Circuit Low Voltage - AutoCodes.com — P1B7C Cadillac Code - Hybrid/Electric Vehicle Battery 51 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B7C Cadillac?

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

How to Fix the DTC P1B7C 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 P1B7C 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.

Need more information about the P1B7C Cadillac code?

Need more information on how to fix the P1B7C Cadillac code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1B7C Cadillac code diagnosed by a professional: Find a repair shop in your area

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 P1B7C Cadillac Code

1. What are common symptoms of OBDII code P1B7C in a Cadillac hybrid vehicle?

- Common symptoms include poor fuel efficiency, reduced power, and the hybrid system not functioning properly.

2. What could cause the OBDII code P1B7C to trigger in a Cadillac hybrid vehicle?

- The code may trigger due to a low voltage condition in the hybrid/electric vehicle battery 51 circuit.

3. How serious is the OBDII code P1B7C in a Cadillac hybrid vehicle?

- This code should be addressed promptly to avoid further damage to the hybrid/electric vehicle battery system.

4. What can I do to diagnose the OBDII code P1B7C in my Cadillac hybrid vehicle?

- A thorough inspection of the hybrid/electric vehicle battery system, wiring, and connections is recommended to diagnose the issue.

5. Can I still drive my Cadillac with the OBDII code P1B7C present?

- It is not recommended to drive the vehicle with this code present, as it can lead to further damage to the hybrid/electric vehicle system.

6. How can I repair OBDII code P1B7C in my Cadillac hybrid vehicle?

- Repairing this code may involve checking and repairing any damaged wiring, replacing faulty components, or recalibrating the hybrid/electric vehicle battery system.

7. Are there any DIY tips for troubleshooting OBDII code P1B7C in a Cadillac hybrid vehicle?

- While basic inspections can be done, diagnosing and repairing this code may require specialized tools and knowledge best handled by a professional technician.

8. How much does it typically cost to repair OBDII code P1B7C in a Cadillac hybrid vehicle?

- Repair costs can vary depending on the extent of the issue, parts needed, and labor rates. It is advisable to get a diagnostic and repair estimate from a trusted mechanic.

9. Can resetting the OBDII system clear the P1B7C code in a Cadillac hybrid vehicle?

- Resetting the OBDII system may temporarily clear the code, but it is important to address the underlying issue to prevent the code from reoccurring.

10. Is it safe to ignore the OBDII code P1B7C in my Cadillac hybrid vehicle?

- Ignoring this code can lead to potential damage to the hybrid/electric vehicle system and should be addressed promptly to ensure the vehicle's safety and performance.