AutoCodes – Cadillac – P1B4C Cadillac

P1B4C Cadillac Code - Hybrid/Electric Vehicle Battery 35 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: P1B4C Cadillac indicates Hybrid/Electric Vehicle Battery 35 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 902

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 09, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1B4C 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 P1B4C Cadillac - Hybrid/Electric Vehicle Battery 35 Circuit Low Voltage - AutoCodes.com — P1B4C Cadillac Code - Hybrid/Electric Vehicle Battery 35 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B4C Cadillac?

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

How to Fix the DTC P1B4C 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 P1B4C 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 P1B4C Cadillac Code

What does the OBDII code P1B4C mean for my Cadillac?

The code P1B4C indicates a low voltage condition in the Hybrid/Electric Vehicle Battery 35 circuit, which can affect the performance of the vehicle's hybrid system.

What symptoms might I experience with the P1B4C code?

Common symptoms include reduced power, warning lights on the dashboard (such as the check engine light), and potential issues with battery charging or performance.

What are the potential causes of the P1B4C code?

Potential causes include a faulty battery, damaged wiring or connectors in the battery circuit, a malfunctioning battery management system, or a weak or failing hybrid battery.

How can I diagnose the issue related to the P1B4C code?

Start by checking the battery voltage with a multimeter, inspect the wiring and connectors for damage, and use a diagnostic scanner to check for additional codes that may provide more context.

What should I do if I get the P1B4C code?

You should first check the battery voltage and inspect the battery connections. If the issue isnâ€™t apparent, consider consulting a qualified technician who specializes in hybrid vehicles for further diagnosis.

Can I drive my Cadillac with the P1B4C code?

While it may be possible to drive the vehicle, it's not recommended as it can lead to further damage to the hybrid system and may result in reduced performance or safety issues.

Is it safe to reset the P1B4C code?

Resetting the code may temporarily turn off the warning lights, but it does not fix the underlying issue. Itâ€™s important to diagnose and repair the problem before clearing the code.

What repairs are typically needed for the P1B4C code?

Repairs may include replacing a faulty battery, repairing or replacing damaged wiring or connectors, or replacing components of the battery management system.

How can I prevent the P1B4C code from occurring in the future?

Regular maintenance of the hybrid battery system, ensuring proper connections, and monitoring battery health can help prevent low voltage issues from arising.