AutoCodes – GMC – P1B35 GMC

P1B35 GMC 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 GMC 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 866

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

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

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 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 P1B35 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.

Need more information about the P1B35 GMC code?

Need more information on how to fix the P1B35 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1B35 GMC code diagnosed by a professional: Find a repair shop in your area

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 GMC Code

1. What are the common symptoms of OBDII code P1B35 in a GMC vehicle?

- Common symptoms include poor fuel efficiency, reduced hybrid system performance, and potential warning lights on the dashboard.

2. What could cause the OBDII code P1B35 to trigger in a GMC vehicle?

- The code may trigger due to issues with the Battery Energy Control Module, faults in the Hybrid Battery Voltage Balance Processor 2, or wiring/connectivity problems.

3. How can I diagnose the OBDII code P1B35 in my GMC vehicle?

- Diagnosing the code typically involves using a professional OBDII scanner to retrieve the specific fault codes and then inspecting the hybrid battery system components for any visible damage or abnormalities.

4. What are some repair tips for fixing OBDII code P1B35 in a GMC vehicle?

- Repair tips may include checking and repairing any damaged wiring or connectors, replacing faulty components like the Battery Energy Control Module, or recalibrating the hybrid battery system.

5. Can I continue driving my GMC vehicle with the OBDII code P1B35 present?

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

6. How much does it typically cost to repair OBDII code P1B35 in a GMC vehicle?

- Repair costs can vary depending on the exact cause of the issue, but they may range from a few hundred dollars for minor repairs to over a thousand dollars for more complex fixes involving major components.

7. Are there any preventive maintenance measures to avoid OBDII code P1B35 in a GMC vehicle?

- Regularly servicing the hybrid system, checking the battery's health, and addressing any warning lights or issues promptly can help prevent the occurrence of this code.

8. Can I reset the OBDII code P1B35 in my GMC vehicle on my own?

- While you can clear the code with an OBDII scanner, it is important to address the underlying issue causing the code to prevent it from reoccurring.

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

- The repair time can vary based on the complexity of the issue, but it may take anywhere from a few hours to a day or more to complete the necessary repairs.

10. Are there any recalls or technical service bulletins related to OBDII code P1B35 in GMC vehicles?

- It is recommended to check with a GMC dealership or visit the manufacturer's website to see if there are any relevant recalls or technical service bulletins related to this OBDII code.