AutoCodes – GMC – P0B88 GMC

P0B88 GMC Code - Hybrid/Electric Vehicle Battery 16 Circuit Low 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: P0B88 GMC indicates Hybrid/Electric Vehicle Battery 16 Circuit Low 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 868

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 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0B88 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 P0B88 GMC - Hybrid/Electric Vehicle Battery 16 Circuit Low Voltage - AutoCodes.com — P0B88 GMC Code - Hybrid/Electric Vehicle Battery 16 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0B88 GMC?

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

How to Fix the DTC P0B88 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 P0B88 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 P0B88 GMC Code

1. What does the OBDII code P0B88 mean on a GMC vehicle?

The P0B88 code indicates a low voltage issue in the Hybrid/Electric Vehicle Battery 16 circuit, often related to battery cell imbalances or wiring faults.

2. What are the common symptoms of the P0B88 code?

Symptoms may include reduced hybrid system performance, warning lights on the dashboard, poor fuel efficiency, or the vehicle entering limp mode.

3. What causes the P0B88 code on a GMC vehicle?

Common causes include faulty battery cells, corroded or damaged wiring, a malfunctioning battery management system, or loose connections in the circuit.

4. Can I drive my GMC with the P0B88 code active?

Itâ€™s not recommended to drive with this code active, as it could lead to further damage to the hybrid/electric system or leave you stranded.

5. How do I diagnose the P0B88 code on my GMC vehicle?

Diagnosis typically involves scanning for additional codes, inspecting the hybrid battery wiring and connections, and testing the voltage of the affected battery cells.

6. How is the P0B88 code repaired?

Repairs may include replacing faulty battery cells, repairing damaged wiring or connections, or reprogramming/updating the battery management system.

7. What tools are needed to fix the P0B88 code on a GMC?

Youâ€™ll need an OBDII scanner capable of reading hybrid system codes, a multimeter for voltage testing, and possibly specialized tools for handling high-voltage components.

8. Can the P0B88 code be caused by a software issue?

Yes, outdated or malfunctioning battery management system software can sometimes cause this code and may require an update or reprogramming.

9. How much does it cost to fix the P0B88 code?

The cost varies depending on the issue, ranging from around $100 for simple wiring repairs to over $1,000 for hybrid battery cell replacement or reprogramming.

10. Should I take my GMC to a dealership for the P0B88 code?

Since this code involves high-voltage components, itâ€™s best to have a qualified technician or dealership handle the diagnosis and repair for safety reasons.