P1B37 Buick Code - Battery Energy Control Module Hybrid Battery Voltage Balance Processor 4 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
- P1B37 Buick indicates Battery Energy Control Module Hybrid Battery Voltage Balance Processor 4 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 P1B37 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 P1B37 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 P1B37 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 P1B37 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 P1B37 Buick Code
1. What does the OBDII code P1B37 mean on a Buick?
P1B37 indicates an issue with the Hybrid Battery Voltage Balance Processor 4 under the Battery Energy Control Module, meaning it is not performing as expected.
2. What are common symptoms of the P1B37 code in a Buick?
Symptoms may include reduced hybrid system performance, a check engine light, decreased fuel efficiency, or limited electric-only driving range.
3. What causes the P1B37 code on a Buick?
Common causes include a malfunctioning battery energy control module, imbalanced hybrid battery cells, wiring issues, or a fault in the voltage balance processor circuitry.
4. How is the P1B37 code diagnosed?
A technician will use a scan tool to verify the code, inspect the hybrid battery system, check for wiring/connectors damage, and test the voltage balance processor for proper operation.
5. Can I drive my Buick with the P1B37 code?
While the vehicle may still be drivable, it is not advisable as it could lead to further damage to the hybrid battery system or reduced vehicle performance.
6. How do you fix the P1B37 code on a Buick?
Repairs may include rebalancing the hybrid battery cells, replacing the battery energy control module, repairing damaged wiring, or updating the module software.
7. How much does it cost to repair the P1B37 code on a Buick?
The cost varies depending on the specific issue but can range from $200 for minor wiring repairs to over $1,000 for hybrid battery module replacement.
8. Can a dead 12V battery cause the P1B37 code on a Buick?
While unlikely, a weak or failing 12V battery can sometimes contribute to hybrid system errors, so it’s worth inspecting as part of the diagnostic process.
9. Does the P1B37 code mean the hybrid battery needs replacement?
Not necessarily. The issue may be with the voltage balance processor or related components rather than the entire hybrid battery.
10. How can I prevent the P1B37 code from recurring in my Buick?
Regular maintenance of the hybrid system, monitoring battery health, and addressing any hybrid-related warning signs promptly can help prevent this code.
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