P1B35 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 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 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?
- 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?
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 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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Information for Specific Makes
- P1B35 Buick — Battery Energy Control Module Hybrid Battery Voltage Balance Processor 2 Performance
- P1B35 Cadillac — Battery Energy Control Module Hybrid Battery Voltage Balance Processor 2 Performance
- P1B35 Chevrolet — Battery Energy Control Module Hybrid Battery Voltage Balance Processor 2 Performance
- P1B35 GMC — Battery Energy Control Module Hybrid Battery Voltage Balance Processor 2 Performance
- P1B35 Saturn — Battery Energy Control Module Hybrid Battery Voltage Balance Processor 2 Performance
Frequently Asked Questions about P1B35 Code
1. What does the OBDII code P1B35 mean?
P1B35 indicates an issue with the Battery Energy Control Module's Hybrid Battery Voltage Balance Processor 2, suggesting it is not performing as expected.
2. What are the common symptoms of code P1B35?
Symptoms may include the hybrid system warning light, reduced fuel efficiency, diminished hybrid performance, or the vehicle entering limp mode.
3. What causes the P1B35 code to appear?
Common causes include a malfunctioning Battery Energy Control Module, issues with the hybrid battery pack, faulty wiring or connectors, or software glitches in the control module.
4. Can I still drive my car with the P1B35 code?
While the vehicle may still operate, driving with this code can lead to further damage to the hybrid system and reduced performance. It’s best to address the issue promptly.
5. How is the P1B35 code diagnosed?
A technician will use a scan tool to confirm the code, check the Battery Energy Control Module’s operation, inspect the hybrid battery pack, and test the wiring and connectors for faults.
6. How do you fix the P1B35 code?
Repairs may involve replacing or reprogramming the Battery Energy Control Module, repairing or replacing damaged wiring, or addressing issues with the hybrid battery pack.
7. Do I need to replace the hybrid battery if I get the P1B35 code?
Not necessarily. The issue may be with the control module or wiring. A thorough diagnosis is required to determine the root cause.
8. Can a software update fix the P1B35 code?
In some cases, a software update for the Battery Energy Control Module may resolve the issue, but this depends on the manufacturer and the specific circumstances.
9. How much does it cost to repair the P1B35 code?
Repair costs vary depending on the root cause. Replacing the Battery Energy Control Module can cost $500-$1,500, while hybrid battery repairs or replacements are generally more expensive.
10. How can I prevent the P1B35 code from occurring?
Regular maintenance of the hybrid system, ensuring proper operation of the Battery Energy Control Module, and addressing warning signs early can help prevent this code.
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