AutoCodes – Generic – P1B2A

P1B2A Code - Hybrid/Electric Vehicle Battery 29 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: P1B2A indicates Hybrid/Electric Vehicle Battery 29 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 961

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 P1B2A 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 P1B2A - Hybrid/Electric Vehicle Battery 29 Circuit - AutoCodes.com — P1B2A Code - Hybrid/Electric Vehicle Battery 29 Circuit

What does this mean?

What are the Possible Causes of the DTC P1B2A?

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

How to Fix the DTC P1B2A?

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 P1B2A 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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Information for Specific Makes

P1B2A Buick — Hybrid/Electric Vehicle Battery 29 Circuit
P1B2A Cadillac — Hybrid/Electric Vehicle Battery 29 Circuit
P1B2A Chevrolet — Hybrid/Electric Vehicle Battery 29 Circuit
P1B2A GMC — Hybrid/Electric Vehicle Battery 29 Circuit
P1B2A Saturn — Hybrid/Electric Vehicle Battery 29 Circuit

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 P1B2A Code

1. What are the common symptoms of OBDII code P1B2A related to Hybrid/Electric Vehicle Battery 29 Circuit?

- Common symptoms include decreased fuel efficiency, difficulty starting the vehicle, and illuminated warning lights on the dashboard.

2. What are the possible causes of OBDII code P1B2A in Hybrid/Electric vehicles?

- Possible causes may include a faulty battery pack, issues with the battery management system, damaged wiring, or a malfunctioning battery control module.

3. How can I diagnose the Hybrid/Electric Vehicle Battery 29 Circuit issue causing code P1B2A?

- Diagnose the issue by performing a thorough inspection of the battery pack, checking the battery management system for errors, and using a diagnostic scanner to read specific codes and data related to the battery circuit.

4. Can I continue driving my Hybrid/Electric vehicle with OBDII code P1B2A present?

- It is not recommended to continue driving with this code active, as it can lead to further damage to the battery system and potentially affect the overall performance of the vehicle.

5. Are there any simple repair tips for fixing OBDII code P1B2A on a Hybrid/Electric vehicle?

- Simple repair tips may include checking and tightening any loose connections, replacing damaged wiring, resetting the battery management system, and ensuring the battery pack is functioning properly.

6. How much does it typically cost to repair OBDII code P1B2A related to Hybrid/Electric Vehicle Battery 29 Circuit?

- The cost of repair can vary depending on the specific issue causing the code, but it may range from a few hundred to a few thousand dollars, especially if components like the battery pack or control module need to be replaced.

7. Can a DIY enthusiast fix OBDII code P1B2A on a Hybrid/Electric vehicle?

- While some simple repairs like checking connections or resetting systems can be done by DIY enthusiasts, diagnosing and repairing complex issues related to the Hybrid/Electric Vehicle Battery 29 Circuit may require professional expertise and specialized tools.

8. How long does it take to repair OBDII code P1B2A on a Hybrid/Electric vehicle?

- The repair time can vary depending on the complexity of the issue and the availability of parts. In some cases, it may be a quick fix, while in others, it could take several hours or even days to fully resolve the problem.