AutoCodes – Cadillac – P1B35 Cadillac

P1B35 Cadillac Code - Battery Energy Control Module Hybrid Battery Voltage Balance Processor 2 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: P1B35 Cadillac indicates Battery Energy Control Module Hybrid Battery Voltage Balance Processor 2 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 1,003

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 P1B35 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 P1B35 Cadillac - Battery Energy Control Module Hybrid Battery Voltage Balance Processor 2 Performance - AutoCodes.com — P1B35 Cadillac Code - Battery Energy Control Module Hybrid Battery Voltage Balance Processor 2 Performance

What does this mean?

What are the Possible Causes of the DTC P1B35 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 P1B35 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 P1B35 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 P1B35 Cadillac Code

1. What are common symptoms of OBDII code P1B35 in a Cadillac related to the Battery Energy Control Module Hybrid Battery Voltage Balance Processor 2 Performance?

- Common symptoms include poor fuel efficiency, reduced power output, and potential illumination of the hybrid system warning light.

2. What can cause the OBDII code P1B35 to set in a Cadillac?

- This code can be triggered by issues such as a faulty battery energy control module, an imbalance in hybrid battery voltage, or a malfunction in the processor 2 performance.

3. How can I diagnose the OBDII code P1B35 in a Cadillac myself?

- Diagnosing this code may involve using a scan tool to retrieve the specific fault codes, checking the hybrid battery voltage levels, and inspecting the battery energy control module for any visible damage.

4. Is it safe to continue driving my Cadillac with the OBDII code P1B35 present?

- It is not recommended to drive the vehicle with this code active, as it can lead to further damage to the hybrid system and potentially compromise the vehicle's performance and safety.

5. What are some repair tips for addressing the OBDII code P1B35 in a Cadillac?

- Repair tips may include repairing or replacing the faulty battery energy control module, performing a voltage balance procedure on the hybrid battery, and ensuring proper connection and operation of the processor 2.

6. Can resetting the OBDII code P1B35 in a Cadillac temporarily resolve the issue?

- Resetting the code may temporarily clear the warning light, but if the underlying issue causing the code is not addressed, it is likely to return and may lead to more serious problems.

7. How much does it typically cost to repair the OBDII code P1B35 in a Cadillac?

- Repair costs can vary depending on the exact cause of the code, but they may range from a few hundred to over a thousand dollars, especially if components like the battery energy control module need to be replaced.

8. Are there any recalls or technical service bulletins related to the OBDII code P1B35 in Cadillac vehicles?

- It is recommended to check with a Cadillac dealership or the manufacturer's website for any relevant recalls or technical service bulletins related to this specific OBDII code to see if there are any known issues or solutions.

9. How long does it typically take to repair the OBDII code P1B35 in a Cadillac?

- The repair time can vary depending on the extent of the issue and the availability of parts, but it may take a few hours to a full day for a qualified technician to diagnose and address the problem causing the code.

10. Can a DIY enthusiast with automotive experience repair the OBDII code P1B35 in a Cadillac themselves?

- While some aspects of diagnosing and repairing this code may be possible for experienced DIY enthusiasts, it is recommended to consult a professional technician or dealership for proper diagnosis and repair to ensure the issue is resolved correctly and safely.