AutoCodes – Cadillac – P0B90 Cadillac

P0B90 Cadillac Code - Hybrid/Electric Vehicle Battery 18 Circuit

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: P0B90 Cadillac indicates Hybrid/Electric Vehicle Battery 18 Circuit.
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 993

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 P0B90 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 P0B90 Cadillac - Hybrid/Electric Vehicle Battery 18 Circuit - AutoCodes.com — P0B90 Cadillac Code - Hybrid/Electric Vehicle Battery 18 Circuit

What does this mean?

What are the Possible Causes of the DTC P0B90 Cadillac?

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

How to Fix the DTC P0B90 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 P0B90 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 P0B90 Cadillac Code

1. What does the OBDII code P0B90 mean on a Cadillac?

P0B90 indicates an issue with the Hybrid/Electric Vehicle Battery 18 Circuit, which refers to a specific cell or group of cells in the high-voltage battery.

2. What are the symptoms of code P0B90 on a Cadillac?

Common symptoms include reduced fuel efficiency, limited electric drive performance, warning lights on the dashboard, or difficulty starting the vehicle.

3. What causes the P0B90 code in a Cadillac?

Possible causes include faulty battery module connections, degraded or damaged battery cells, corroded wiring, or a malfunctioning battery control module.

4. Can I drive my Cadillac with a P0B90 code?

You may still be able to drive, but itâ€™s not recommended as it could lead to further damage to the hybrid system or reduced performance.

5. How is the P0B90 code diagnosed?

A technician will use a diagnostic scanner to identify the code, inspect the specific battery circuit (Battery 18), and check for issues like loose connections or damaged wiring.

6. What repairs are needed to fix the P0B90 code on a Cadillac?

Repairs could involve replacing faulty battery cells, repairing wiring or terminals, or recalibrating the battery control module.

7. How much does it cost to fix the P0B90 code on a Cadillac?

The cost can vary widely, ranging from a few hundred dollars for minor wiring repairs to several thousand dollars if the battery pack or control module needs replacement.

8. Can a P0B90 code be caused by software issues?

While less common, software glitches in the battery control module could potentially trigger the P0B90 code and may require reprogramming or updates.

9. How can I prevent the P0B90 code from occurring again?

Regular maintenance, avoiding extreme temperature exposure, and ensuring proper charging practices can help prolong battery life and prevent circuit issues.

10. Do I need to replace the entire high-voltage battery for a P0B90 code?

Not necessarily; in many cases, only the affected battery module or circuit may need repair or replacement, depending on the extent of the damage.