AutoCodes – GMC – P1BB4 GMC

P1BB4 GMC Code - Hybrid/Electric Vehicle Battery 70 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: P1BB4 GMC indicates Hybrid/Electric Vehicle Battery 70 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 862

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 P1BB4 GMC 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 P1BB4 GMC - Hybrid/Electric Vehicle Battery 70 Circuit Performance - AutoCodes.com — P1BB4 GMC Code - Hybrid/Electric Vehicle Battery 70 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1BB4 GMC?

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

How to Fix the DTC P1BB4 GMC?

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 P1BB4 GMC 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 P1BB4 GMC Code

1. What are the common symptoms of OBDII code P1BB4 in a GMC Hybrid/Electric Vehicle?

- Common symptoms include reduced hybrid battery performance, decreased fuel efficiency, and potential illumination of the check engine light.

2. What typically causes the OBDII code P1BB4 in a GMC Hybrid/Electric Vehicle?

- This code is usually triggered by issues with the Hybrid/Electric Vehicle Battery 70 Circuit, such as wiring faults, damaged connectors, or problems with the battery itself.

3. How can I diagnose the Hybrid/Electric Vehicle Battery 70 Circuit to address the P1BB4 code?

- To diagnose the circuit, it is recommended to perform a thorough inspection of the battery connections, wiring, and related components. Testing with a multimeter may also help pinpoint the issue.

4. Is it safe to continue driving with the P1BB4 code present in a GMC Hybrid/Electric Vehicle?

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

5. Can I reset the P1BB4 code on my GMC Hybrid/Electric Vehicle without addressing the underlying issue?

- While you can clear the code temporarily, it is essential to address the root cause of the problem to prevent the code from reoccurring and ensure the proper functioning of the hybrid battery system.

6. Are there any DIY repair tips for fixing the Hybrid/Electric Vehicle Battery 70 Circuit issue related to the P1BB4 code?

- DIY repairs may include checking and cleaning the battery connections, inspecting the wiring for damage, and ensuring all connectors are secure. However, complex issues may require professional diagnosis and repair.

7. How much does it typically cost to repair the Hybrid/Electric Vehicle Battery 70 Circuit for the P1BB4 code in a GMC vehicle?

- Repair costs can vary depending on the extent of the issue and whether it involves simple fixes like connector cleaning or more complex repairs like wiring replacement. It is advisable to consult with a qualified technician for an accurate estimate.

8. Can the OBDII code P1BB4 be caused by issues other than the Hybrid/Electric Vehicle Battery 70 Circuit in a GMC Hybrid/Electric Vehicle?

- While the code is primarily linked to battery circuit performance, it is essential to rule out other potential causes such as sensor malfunctions or software glitches before focusing solely on the battery circuit.

9. Will replacing the hybrid or electric vehicle battery be necessary to resolve the P1BB4 code in a GMC vehicle?

- In some cases, replacing the battery may be necessary if the issue is severe or irreparable. However, it is advisable to explore other repair options first, as battery replacement can be a significant expense.

10. How can regular maintenance help prevent the occurrence of the P1BB4 code in a GMC Hybrid/Electric Vehicle?

- Regular maintenance, including inspections of the battery system, electrical components, and wiring, can help detect potential issues early and prevent the onset of the P1BB4 code.