AutoCodes – Generic – P1B4D

P1B4D Code - Hybrid/Electric Vehicle Battery 35 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: P1B4D indicates Hybrid/Electric Vehicle Battery 35 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 931

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 09, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1B4D 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 P1B4D - Hybrid/Electric Vehicle Battery 35 Circuit High Voltage - AutoCodes.com — P1B4D Code - Hybrid/Electric Vehicle Battery 35 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B4D?

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

How to Fix the DTC P1B4D?

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 P1B4D 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.

Need more information about the P1B4D code?

Need more information on how to fix the P1B4D code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1B4D code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1B4D Buick — Hybrid/Electric Vehicle Battery 35 Circuit High Voltage
P1B4D Cadillac — Hybrid/Electric Vehicle Battery 35 Circuit High Voltage
P1B4D Chevrolet — Hybrid/Electric Vehicle Battery 35 Circuit High Voltage
P1B4D GMC — Hybrid/Electric Vehicle Battery 35 Circuit High Voltage
P1B4D Saturn — Hybrid/Electric Vehicle Battery 35 Circuit High Voltage

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 P1B4D Code

1. What are the common symptoms of OBDII code P1B4D (Hybrid/Electric Vehicle Battery 35 Circuit High Voltage)?

- Common symptoms include the check engine light turning on, decreased fuel efficiency, and potential issues with the hybrid/electric vehicle battery system.

2. What are the possible causes of OBDII code P1B4D?

- Possible causes of this code may include a faulty high voltage battery pack, damaged wiring in the circuit, or a malfunctioning battery control module.

3. How can I diagnose OBDII code P1B4D in a hybrid/electric vehicle?

- Diagnosis typically involves using a scan tool to read the code, checking the high voltage battery connections, inspecting the wiring for damage, and testing the battery pack's voltage levels.

4. Can I drive my hybrid/electric vehicle with OBDII code P1B4D present?

- It is not recommended to drive the vehicle with this code active, as it can lead to further damage to the battery system and potentially affect the vehicle's performance and safety.

5. How can I repair OBDII code P1B4D on my hybrid/electric vehicle?

- Repairing this code may involve replacing the high voltage battery pack, repairing any damaged wiring, resetting the battery control module, or seeking assistance from a qualified technician.

6. Are there any safety precautions to consider when dealing with high voltage systems in hybrid/electric vehicles?

- Yes, it is crucial to follow proper safety procedures when working on high voltage systems, such as wearing insulated gloves, using insulated tools, and disconnecting the battery before starting any repairs.

7. Can OBDII code P1B4D be triggered by a temporary issue or sensor malfunction?

- Yes, sometimes this code can be triggered by a temporary glitch or sensor malfunction. It is recommended to clear the code and monitor the vehicle to see if it returns.

8. How often should I have the high voltage battery system in my hybrid/electric vehicle inspected?

- It is recommended to have the high voltage battery system inspected as part of routine maintenance or if you experience any unusual symptoms related to the battery system.

9. Will resetting the OBDII code P1B4D make it go away permanently?

- Resetting the code may clear it temporarily, but if the underlying issue is not addressed, the code is likely to return. It's important to diagnose and repair the root cause of the code.

10. Is OBDII code P1B4D a common issue in hybrid/electric vehicles?

- While not extremely common, this code can occur in hybrid/electric vehicles, especially as they age and components wear out. Regular maintenance and inspections can help prevent issues like this.