AutoCodes – Cadillac – P1B57 Cadillac

P1B57 Cadillac Code - Hybrid/Electric Vehicle Battery 39 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: P1B57 Cadillac indicates Hybrid/Electric Vehicle Battery 39 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 797

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 P1B57 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 P1B57 Cadillac - Hybrid/Electric Vehicle Battery 39 Circuit Performance - AutoCodes.com — P1B57 Cadillac Code - Hybrid/Electric Vehicle Battery 39 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1B57 Cadillac?

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

How to Fix the DTC P1B57 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 P1B57 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 P1B57 Cadillac Code

1. What does the OBDII code P1B57 mean on a Cadillac?

P1B57 indicates a performance issue in the Hybrid/Electric Vehicle Battery 39 circuit, typically related to a specific cell or module within the hybrid battery system.

2. What are common symptoms of the P1B57 code on a Cadillac?

Symptoms may include reduced fuel efficiency, limited hybrid system performance, warning lights on the dashboard, and potential battery-related error messages.

3. What causes the P1B57 code to trigger?

The code is often caused by a faulty battery cell, loose or corroded wiring, a defective battery control module, or poor electrical connections in the battery circuit.

4. Can I drive my Cadillac with a P1B57 code?

While the vehicle may still drive, it is not recommended to ignore this code as it can lead to further damage to the hybrid battery system and reduced vehicle performance.

5. How is the P1B57 code diagnosed?

A technician will use a scan tool to read the code, inspect the affected battery circuit, check wiring and connections, and test the voltage levels of the battery cells.

6. What repairs can fix the P1B57 code on a Cadillac?

Repairs may include replacing a faulty battery cell or module, repairing or replacing damaged wiring, cleaning corroded connections, or reprogramming the battery control module if needed.

7. How much does it cost to fix a P1B57 code on a Cadillac?

The repair cost depends on the root cause. Replacing a battery cell or module can range from several hundred to a few thousand dollars, while wiring repairs are generally less expensive.

8. Can the P1B57 code be cleared without repairs?

Clearing the code without addressing the underlying issue will likely result in the code returning. Proper diagnosis and repair are necessary to resolve the problem.

9. What tools are needed to diagnose the P1B57 code?

A professional-grade OBDII scan tool, a multimeter, and manufacturer-specific diagnostic procedures are typically required for accurate diagnosis.

10. Can a weak 12-volt battery cause the P1B57 code?

A weak 12-volt battery generally doesnâ€™t cause the P1B57 code, but it can affect the overall performance of the hybrid system and should be tested as part of the diagnosis.