AutoCodes – Buick – P1B90 Buick

P1B90 Buick Code - Hybrid/Electric Vehicle Battery 58 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: P1B90 Buick indicates Hybrid/Electric Vehicle Battery 58 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 1,323

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 P1B90 Buick 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 P1B90 Buick - Hybrid/Electric Vehicle Battery 58 Circuit Performance - AutoCodes.com — P1B90 Buick Code - Hybrid/Electric Vehicle Battery 58 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1B90 Buick?

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

How to Fix the DTC P1B90 Buick?

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 P1B90 Buick 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 P1B90 Buick Code

1. What does the OBDII code P1B90 mean on a Buick?

P1B90 indicates a performance issue in the Hybrid/Electric Vehicle Battery 58 circuit, which is linked to the high-voltage battery system.

2. What are the common symptoms of the P1B90 code?

Symptoms may include an illuminated check engine light, reduced fuel efficiency, limited electric range, or reduced performance in hybrid or electric modes.

3. What causes the P1B90 code on a Buick?

Common causes include a faulty high-voltage battery cell, damaged wiring or connectors in the circuit, or a malfunctioning battery control module.

4. Can I drive my Buick with the P1B90 code?

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

5. How is the P1B90 code diagnosed?

A technician will use a scan tool to retrieve the code, inspect the battery circuit wiring and connectors, and test the high-voltage battery and control module.

6. What repairs can fix the P1B90 code?

Repairs may include replacing the affected battery cell, repairing or replacing damaged wiring, or replacing a faulty battery control module.

7. How much does it cost to fix a P1B90 code?

Repair costs vary depending on the issue, but replacing a high-voltage battery cell or control module can be expensive, often ranging from several hundred to a few thousand dollars.

8. Can a loose connection cause the P1B90 code to appear?

Yes, a loose or corroded connection in the battery 58 circuit can trigger the P1B90 code.

9. Does the P1B90 code require reprogramming the control module?

In some cases, reprogramming or updating the battery control module software may be necessary after repairs are completed.

10. Can regular maintenance prevent the P1B90 code?

While not always preventable, regular inspections of the high-voltage battery system and ensuring proper connections can help reduce the likelihood of this code appearing.