AutoCodes – GMC – P0B52 GMC

P0B52 GMC Code - Hybrid/Electric Vehicle Battery 5 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: P0B52 GMC indicates Hybrid/Electric Vehicle Battery 5 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 984

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 07, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0B52 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 P0B52 GMC - Hybrid/Electric Vehicle Battery 5 Circuit High Voltage - AutoCodes.com — P0B52 GMC Code - Hybrid/Electric Vehicle Battery 5 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0B52 GMC?

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

How to Fix the DTC P0B52 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 P0B52 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 P0B52 GMC Code

1. What does the OBDII code P0B52 mean on a GMC vehicle?

P0B52 indicates a "Hybrid/Electric Vehicle Battery 5 Circuit High Voltage," meaning the vehicle's hybrid or EV battery module 5 is experiencing higher-than-expected voltage readings.

2. What are common symptoms of the P0B52 code?

Symptoms may include the check engine light or hybrid system warning light, reduced fuel efficiency, limited power output, or the vehicle entering limp mode.

3. What causes the P0B52 code to appear?

Common causes include a faulty battery module, a malfunctioning battery control module, corroded or damaged wiring, or a problem with the battery voltage sensor.

4. Can I drive my GMC vehicle with the P0B52 code?

Driving with this code is not recommended, as it may lead to further damage to the hybrid battery system and potentially compromise vehicle performance or safety.

5. How do I diagnose the P0B52 code?

A professional technician will use a scan tool to check for related codes, inspect the battery control module, test the battery module's voltage, and examine the wiring and connectors for damage or corrosion.

6. What repairs can fix the P0B52 code?

Repairs may include replacing the faulty battery module, repairing or replacing damaged wiring, cleaning corroded connectors, or reprogramming the battery control module if necessary.

7. Does the P0B52 code mean the hybrid battery needs replacement?

Not necessarily. While it could indicate a failing battery module, the issue might also be related to wiring, sensors, or the control module.

8. How much does it cost to fix the P0B52 code on a GMC?

The cost depends on the root cause. Wiring or connector repairs may cost a few hundred dollars, while battery module or control module replacements can range from $1,000 to $5,000 or more.

9. Can a low auxiliary battery cause the P0B52 code?

While unlikely, a low or failing 12V auxiliary battery can sometimes affect the hybrid system's performance and should be tested as part of the diagnosis.

10. How can I prevent the P0B52 code from recurring?

Regular maintenance, including checking connectors for corrosion, inspecting wiring, and ensuring the hybrid battery system is serviced as recommended, can help prevent this code.