AutoCodes – Buick – P1B69 Buick

P1B69 Buick Code - Hybrid/Electric Vehicle Battery 45 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: P1B69 Buick indicates Hybrid/Electric Vehicle Battery 45 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 820

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 P1B69 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 P1B69 Buick - Hybrid/Electric Vehicle Battery 45 Circuit Performance - AutoCodes.com — P1B69 Buick Code - Hybrid/Electric Vehicle Battery 45 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1B69 Buick?

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

How to Fix the DTC P1B69 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 P1B69 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 P1B69 Buick Code

1. What does the OBDII code P1B69 mean on a Buick?

P1B69 indicates a performance issue with the Hybrid/Electric Vehicle Battery 45 Circuit, often related to voltage irregularities or communication errors in the battery system.

2. What are the symptoms of code P1B69 in a Buick?

Common symptoms include reduced hybrid/electric performance, the check engine light being illuminated, and potential loss of regenerative braking functionality.

3. What causes the P1B69 code in a Buick hybrid or electric vehicle?

This code is typically caused by faulty battery cells, wiring issues, damaged connectors, or a malfunction in the battery management system (BMS).

4. Can I drive my Buick with the P1B69 code?

While the vehicle may still be drivable, continued use could lead to further damage or reduced performance. Itâ€™s recommended to address the issue promptly.

5. How do I diagnose the P1B69 code on my Buick?

Diagnosis usually involves scanning the vehicle with an advanced OBDII scanner, inspecting battery circuits, checking for loose or damaged wiring, and testing the battery management system.

6. What repairs are needed to fix the P1B69 code?

Repairs may include replacing damaged wiring, repairing or replacing battery connectors, reprogramming the battery management system, or replacing defective battery modules.

7. How much does it cost to fix the P1B69 code on a Buick?

Repair costs can vary widely, ranging from $200 for simple wiring fixes to over $1,000 if a battery module or BMS replacement is required.

8. Can a weak 12-volt battery trigger the P1B69 code?

In some cases, a weak or faulty 12-volt battery may contribute to communication errors or voltage issues, indirectly triggering this code.

9. Does the P1B69 code mean my Buickâ€™s hybrid battery is failing?

Not necessarily. While it can indicate an issue with the hybrid battery, it may also result from wiring or sensor problems. Proper diagnosis is essential.

10. Can I reset the P1B69 code without repairs?

Clearing the code without addressing the underlying issue may temporarily turn off the warning light, but the problem is likely to return until repairs are made.