AutoCodes – Cadillac – P1B39 Cadillac

P1B39 Cadillac Code - Battery Energy Control Module Hybrid Battery Voltage Balance Processor 6 Performance

Quick Answer

The hybrid battery pack contains a total of 32 cell groups in the hybrid/EV battery pack assembly. Common causes include Faulty Battery Energy Control Module, Battery Energy Control Module harness is open or shorted, Battery Energy Control Module circuit poor electrical connection. 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: P1B39 Cadillac indicates Battery Energy Control Module Hybrid Battery Voltage Balance Processor 6 Performance.
Common causes: Common causes include Faulty Battery Energy Control Module, Battery Energy Control Module harness is open or shorted, Battery Energy Control Module circuit poor electrical connection.
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 854

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 P1B39 Cadillac Description

The hybrid battery pack contains a total of 32 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 118 V DC. The battery cells are grouped together into two sections, each with 16 cell groups.
The battery energy control module monitors the voltage of the 32 battery cell groups. A voltage sense circuit is attached to each individual cell group. Each of these circuits terminate at a connector located on the top surface of the battery section. A serviceable auxiliary battery wiring harness connectors the voltage sense circuits to the battery energy control module, located directly above the hybrid battery pack.
To ensure proper battery function and lengthen battery life, the battery energy control module balances the voltage of the cells so that each cells maintains the same voltage level. The battery energy control module uses internal voltage gates to transfer voltage from cells with a higher voltage level to those cells with a lower voltage level. To maintain a similar state of charge on the cell groups, the starter/generator control module monitors the cell voltages and determines which cells need energy removed in order to maintain the cells at a similar state of charge. A resistor wired in parallel with the cell and a transistor switch in series with the resistor internal to the battery energy control module. The starter/generator control module sends a command to the battery energy control module to begin cell balancing.

OBDII Code P1B39 Cadillac - Battery Energy Control Module Hybrid Battery Voltage Balance Processor 6 Performance - AutoCodes.com — P1B39 Cadillac Code - Battery Energy Control Module Hybrid Battery Voltage Balance Processor 6 Performance

What does this mean?

What are the Possible Causes of the DTC P1B39 Cadillac?

Faulty Battery Energy Control Module
Battery Energy Control Module harness is open or shorted
Battery Energy Control Module circuit poor electrical connection

How to Fix the DTC P1B39 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 P1B39 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 P1B39 Cadillac Code

1. What are the common symptoms of OBDII code P1B39 in a Cadillac related to the Battery Energy Control Module Hybrid Battery Voltage Balance Processor 6 Performance?

The common symptoms include reduced hybrid system performance, decreased fuel efficiency, warning lights on the dashboard, and potential issues with starting the vehicle.

2. What are the possible causes of OBDII code P1B39 in a Cadillac?

Possible causes of this code can be a malfunctioning Battery Energy Control Module, issues with the hybrid battery voltage balance processor, wiring problems, or a faulty hybrid battery.

3. How can I diagnose the OBDII code P1B39 in my Cadillac?

Diagnosing this code may require specialized equipment to read the hybrid system codes, checking the hybrid battery voltage levels, inspecting the wiring and connectors related to the Battery Energy Control Module, and performing a thorough system scan.

4. Can I continue driving my Cadillac with the OBDII code P1B39 present?

It is not recommended to drive your Cadillac with this code present, as it can affect the performance and efficiency of the hybrid system. It's best to have the issue diagnosed and repaired as soon as possible.

5. What are the repair options for OBDII code P1B39 in a Cadillac?

Repair options may include replacing the Battery Energy Control Module, addressing any wiring issues, recalibrating the hybrid system, or replacing the hybrid battery if necessary.

6. How much does it typically cost to repair OBDII code P1B39 in a Cadillac?

The cost of repairing this code can vary depending on the exact cause of the issue, the extent of the damage, and the labor rates in your area. It's recommended to get a diagnosis from a qualified mechanic for an accurate estimate.

7. Are there any preventive maintenance tips to avoid OBDII code P1B39 in a Cadillac?

Regularly servicing the hybrid system, keeping the Battery Energy Control Module and related components in good condition, and addressing any warning signs promptly can help prevent issues that may trigger this code.

8. Can a DIY enthusiast repair OBDII code P1B39 in a Cadillac?

Due to the complexity of hybrid systems and the specialized equipment required for diagnosis and repair, it's recommended to seek assistance from a professional mechanic with experience in hybrid vehicles.

9. How long does it take to repair OBDII code P1B39 in a Cadillac?

The repair time can vary depending on the exact cause of the issue, the availability of parts, and the workload of the repair shop. It's best to consult with the mechanic performing the repair for a more accurate timeframe.

10. Will resetting the OBDII code P1B39 in a Cadillac make it go away permanently?

Resetting the code may temporarily clear the warning lights, but if the underlying issue is not addressed, the code is likely to reappear. It's important to diagnose and repair the root cause of the problem to prevent future issues.