AutoCodes – Cadillac – P1B52 Cadillac

P1B52 Cadillac 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 Cadillac 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 888

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

What does this mean?

What are the Possible Causes of the DTC P1B52 Cadillac?

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

How to Fix the DTC P1B52 Cadillac?

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 Cadillac 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 Cadillac Code

1. What are the common symptoms of OBDII code P1B52 in a Cadillac Hybrid/Electric Vehicle?

- Common symptoms may include reduced hybrid system performance, poor fuel efficiency, warning lights on the dashboard, and potential issues with the high voltage battery.

2. What can cause the OBDII code P1B52 in a Cadillac Hybrid/Electric Vehicle?

- The code P1B52 may be triggered by issues such as a faulty high voltage battery cell, damaged wiring or connectors in the battery circuit, or a malfunctioning battery management system.

3. How can I diagnose the OBDII code P1B52 in my Cadillac Hybrid/Electric Vehicle?

- Diagnosis typically involves using a professional OBDII scanner to read the specific fault code, inspecting the high voltage battery components for visible damage, and testing the battery cells and circuitry for proper operation.

4. Is it safe to continue driving with the OBDII code P1B52 present in a Cadillac Hybrid/Electric Vehicle?

- It is not recommended to continue driving with the code P1B52 as it indicates potential issues with the high voltage battery system, which can pose safety risks and further damage to the vehicle if not addressed promptly.

5. How can I repair the OBDII code P1B52 in my Cadillac Hybrid/Electric Vehicle?

- Repairing the code P1B52 may involve replacing a faulty high voltage battery cell, repairing or replacing damaged wiring or connectors in the battery circuit, or recalibrating the battery management system as recommended by a qualified technician.

6. Can I reset the OBDII code P1B52 in my Cadillac Hybrid/Electric Vehicle myself?

- While you can attempt to clear the code using an OBDII scanner, it is crucial to address the underlying issue causing the code to prevent it from reoccurring. It is recommended to seek professional diagnosis and repair.

7. Are there any safety precautions to take when working on the high voltage battery system related to code P1B52 in a Cadillac Hybrid/Electric Vehicle?

- Yes, when working on the high voltage battery system, always follow manufacturer safety guidelines, wear appropriate personal protective equipment, and consider disconnecting the high voltage system before performing any repairs to avoid electrical hazards.

8. How often does the OBDII code P1B52 occur in Cadillac Hybrid/Electric Vehicles?

- The frequency of the code P1B52 occurrence can vary depending on the age, usage, and maintenance of the vehicle's high voltage battery system. Regular inspection and maintenance can help prevent such issues.

9. Can extreme weather conditions affect the likelihood of OBDII code P1B52 appearing in a Cadillac Hybrid/Electric Vehicle?

- Yes, extreme temperatures, both hot and cold, can impact the performance and health of the high voltage battery system, potentially leading to issues like the code P1B52. Proper battery management and temperature control are essential in such conditions.

10. Is there a specific maintenance schedule recommended to prevent the OBDII code P1B52 in Cadillac Hybrid/Electric Vehicles?

- While there may not be a specific maintenance schedule, regular inspections of the high voltage battery system, monitoring battery health, and following manufacturer recommendations for battery care can help prevent issues like the code P1B52.