P1B35 Chevrolet 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 Chevrolet 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.
Code P1B35 Chevrolet Description
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.
What are the Possible Causes of the DTC P1B35 Chevrolet?
- 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 Chevrolet?
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 Chevrolet 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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Frequently Asked Questions about P1B35 Chevrolet Code
What does the OBDII code P1B35 mean on a Chevrolet?
The code P1B35 indicates an issue with the Battery Energy Control Module related to the hybrid battery's Voltage Balance Processor 2 performance.
What are common symptoms of the P1B35 code?
Typical symptoms include reduced fuel efficiency, warning lights on the dashboard, limited hybrid system performance, or difficulty charging the hybrid battery.
What causes the P1B35 code to appear?
This code is often triggered by poor voltage balancing in the hybrid battery, a malfunctioning Battery Energy Control Module, degraded battery cells, or wiring issues.
Can driving with the P1B35 code cause damage?
Yes, prolonged driving with this code may lead to further hybrid system or battery damage and reduced vehicle performance.
How is the P1B35 code diagnosed?
A mechanic will use an advanced scan tool to check the Battery Energy Control Module, inspect the hybrid battery's voltage balance, and check for wiring or connection problems.
Can the P1B35 code be fixed without replacing the hybrid battery?
In some cases, issues like wiring faults or module calibration errors can be repaired without replacing the hybrid battery.
What repairs are needed to resolve the P1B35 code?
Repairs may include recalibrating the Battery Energy Control Module, fixing wiring or connectors, replacing faulty battery cells, or replacing the module itself.
How much does it cost to fix the P1B35 code?
Costs vary depending on the repair needed, ranging from $150 for wiring repairs to several thousand dollars if the hybrid battery or module needs replacement.
Can a weak 12V battery cause the P1B35 code?
While unlikely, a weak 12V battery can affect the hybrid system’s operation and may contribute to related issues.
Should I visit a dealership or independent shop for the P1B35 code?
A dealership is often better equipped to handle hybrid-specific issues, but experienced independent shops with hybrid expertise can also diagnose and repair this code.
Discuss the causes and fixes for P1B35 Chevrolet OBDII Code
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