AutoCodes – Buick – P1B52 Buick

P1B52 Buick Code - Hybrid/Electric Vehicle Battery 37 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: P1B52 Buick indicates Hybrid/Electric Vehicle Battery 37 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 1,113

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
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Code P1B52 Buick 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 P1B52 Buick - Hybrid/Electric Vehicle Battery 37 Circuit High Voltage - AutoCodes.com — P1B52 Buick Code - Hybrid/Electric Vehicle Battery 37 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B52 Buick?

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

How to Fix the DTC P1B52 Buick?

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 P1B52 Buick 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 P1B52 Buick Code

1. What does OBDII code P1B52 mean on a Buick?

Code P1B52 indicates a "Hybrid/Electric Vehicle Battery 37 Circuit High Voltage" issue, meaning the vehicle's control module has detected excessively high voltage in battery circuit 37.

2. What are the common symptoms of code P1B52 in a Buick?

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

3. What causes code P1B52 to appear on a Buick?

Common causes include a malfunctioning hybrid battery module, damaged wiring in the circuit, poor electrical connections, or a faulty battery control module.

4. Can I drive my Buick with the P1B52 code?

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

5. How is code P1B52 diagnosed in a Buick?

A technician will use a scan tool to read the code, inspect the battery module and related wiring, and test the voltage levels in circuit 37 to locate the issue.

6. What should I check first if I get a P1B52 code?

Start by inspecting the wiring and connectors associated with the hybrid battery for damage, corrosion, or loose connections.

7. How do you fix code P1B52 on a Buick?

Repairs may include replacing damaged wiring, repairing faulty connectors, or replacing the hybrid battery module if it is defective.

8. Is code P1B52 covered under warranty for a Buick?

Hybrid and electric vehicle components often have extended warranties, so check your warranty coverage for repair or replacement of the affected parts.

9. How much does it cost to fix code P1B52 on a Buick?

Repair costs can vary widely, ranging from $100 for wiring repairs to over $1,000 if the hybrid battery module needs replacement.

10. Can a low 12V battery cause code P1B52 in a Buick?

While unlikely, a weak 12V battery can sometimes cause communication errors in hybrid systems. Itâ€™s worth testing the 12V battery as part of the diagnosis.