AutoCodes – Cadillac – P0B93 Cadillac

P0B93 Cadillac Code - Hybrid/Electric Vehicle Battery 18 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: P0B93 Cadillac indicates Hybrid/Electric Vehicle Battery 18 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 1,346

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 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0B93 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 P0B93 Cadillac - Hybrid/Electric Vehicle Battery 18 Circuit High Voltage - AutoCodes.com — P0B93 Cadillac Code - Hybrid/Electric Vehicle Battery 18 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0B93 Cadillac?

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

How to Fix the DTC P0B93 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 P0B93 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 P0B93 Cadillac Code

What does the OBDII code P0B93 mean for a Cadillac?

P0B93 indicates an issue with the high-voltage circuit in battery 18 of the hybrid or electric vehicle, specifically that the voltage is higher than expected.

What are the common symptoms of code P0B93 in a Cadillac?

Symptoms may include a check engine light, reduced hybrid system performance, lower fuel efficiency, or the vehicle switching to a limited power mode.

What causes the P0B93 code to trigger on a Cadillac?

The code can be caused by a faulty battery cell, damaged wiring or connectors in the high-voltage circuit, a defective battery management system, or software issues.

Can I continue driving my Cadillac with the P0B93 code?

Driving is possible but not recommended, as the issue could lead to further damage to the hybrid battery system or reduced vehicle performance.

How is the P0B93 code diagnosed on a Cadillac?

Technicians use a scan tool to read the code, inspect the battery and related circuits for damage, and test voltage levels in battery 18 to confirm abnormal readings.

What repairs might be needed to fix the P0B93 code?

Repairs could include replacing a damaged battery cell, repairing or replacing wiring and connectors, updating the battery management system software, or replacing the battery pack in severe cases.

How much does it cost to fix the P0B93 code on a Cadillac?

Repair costs can range from $200 for wiring repairs to over $2,000 if the battery pack requires replacement, depending on the severity of the issue.

Can a software update resolve the P0B93 code on a Cadillac?

In some cases, a software update for the battery management system may resolve the issue if the problem is not hardware-related.

What tools are needed to troubleshoot the P0B93 code?

Diagnostic tools like an OBDII scanner, a multimeter for voltage testing, and specialized software for hybrid system diagnostics are typically required.

Will clearing the code fix the P0B93 issue permanently?

Clearing the code will turn off the warning light temporarily, but the underlying issue must be addressed to prevent the code from returning.