P1B35 Buick 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 Buick 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 Buick 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 Buick?
- 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 Buick?
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 Buick 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 Buick Code
1. What does the OBDII code P1B35 mean on a Buick?
P1B35 indicates an issue with the Battery Energy Control Module, specifically related to Hybrid Battery Voltage Balance Processor 2's performance.
2. What are the common symptoms of the P1B35 code in a Buick?
Symptoms may include a check engine light, reduced fuel efficiency, decreased hybrid system performance, or the hybrid system not functioning.
3. What causes the P1B35 code on a Buick?
Common causes include a malfunction in the battery energy control module, wiring issues, a faulty hybrid battery, or imbalanced battery voltage.
4. Can I still drive my Buick with the P1B35 code?
While the car may still be drivable, it’s not recommended, as it can lead to further damage to the hybrid system or reduced performance.
5. How is the P1B35 code diagnosed?
A technician will use a scan tool to retrieve the code, inspect the battery energy control module, check for wiring or connection issues, and measure the hybrid battery's voltage balance.
6. How do you fix the P1B35 code on a Buick?
Repairs may involve replacing the battery energy control module, repairing wiring, recalibrating the module, or replacing the hybrid battery if it’s damaged.
7. How much does it cost to fix the P1B35 code on a Buick?
Repair costs vary, but module replacement can range from $300 to $1,000, and hybrid battery replacement can cost between $2,000 and $4,000.
8. Can resetting the code fix the P1B35 issue on a Buick?
Resetting the code may temporarily clear the warning, but it won’t fix the underlying problem causing the code.
9. What happens if I ignore the P1B35 code on my Buick?
Ignoring this code can lead to further damage to the hybrid system, decreased performance, and potentially costly repairs.
10. Can a weak 12-volt battery cause the P1B35 code on a Buick?
While unlikely, a weak 12-volt battery can sometimes affect hybrid system operation and should be checked as part of the diagnostic process.
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