AutoCodes – Buick – P1BDD Buick

P1BDD Buick Code - Hybrid/Electric Vehicle Battery 83 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: P1BDD Buick indicates Hybrid/Electric Vehicle Battery 83 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 950

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 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1BDD 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 P1BDD Buick - Hybrid/Electric Vehicle Battery 83 Circuit High Voltage - AutoCodes.com — P1BDD Buick Code - Hybrid/Electric Vehicle Battery 83 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1BDD Buick?

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

How to Fix the DTC P1BDD 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 P1BDD 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 P1BDD Buick Code

1. What does OBDII code P1BDD mean on a Buick?

P1BDD indicates a "Hybrid/Electric Vehicle Battery 83 Circuit High Voltage" fault, meaning the vehicle's control module has detected an abnormally high voltage in the specified circuit.

2. What are the common symptoms of code P1BDD in a Buick?

Symptoms may include an illuminated check engine light or hybrid warning light, reduced fuel efficiency, decreased hybrid system performance, or the vehicle entering a limited power mode.

3. What causes the P1BDD code to appear on a Buick hybrid or electric vehicle?

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

4. Can I drive my Buick with a P1BDD code?

It is not recommended to drive with this code, especially if the vehicle is in reduced power mode, as it could worsen the issue or pose safety risks related to the high-voltage system.

5. How is the P1BDD code diagnosed on a Buick?

A technician will use a scan tool to read freeze frame data, inspect the high-voltage battery and related wiring, check for loose or damaged connectors, and test the battery control module.

6. What repairs are needed to fix the P1BDD code on a Buick?

Repairs may involve replacing a faulty high-voltage battery cell, repairing or replacing damaged wiring or connectors, reprogramming the battery control module, or replacing it if defective.

7. How much does it cost to fix the P1BDD code on a Buick?

The repair cost varies widely depending on the exact issue. Wiring repairs may cost a few hundred dollars, while replacing a high-voltage battery can exceed $1,000.

8. What tools are required to troubleshoot the P1BDD code?

Diagnosing this code typically requires an advanced OBDII scan tool, a multimeter for testing electrical connections, and knowledge of high-voltage safety procedures.

9. Can low voltage in the 12V battery cause the P1BDD code?

While rare, low voltage in the 12V auxiliary battery could cause communication or sensor errors in the hybrid system, potentially triggering the code.

10. Is the P1BDD code unique to Buick vehicles?

No, variations of the P1BDD code can appear in other hybrid or electric vehicles, but the specifics of the fault and its repair will vary by manufacturer.