AutoCodes – Chevrolet – P1B37 Chevrolet

P1B37 Chevrolet 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 Chevrolet 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.

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Code Popularity 1,052

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
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Code P1B37 Chevrolet 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 P1B37 Chevrolet - Battery Energy Control Module Hybrid Battery Voltage Balance Processor 4 Performance - AutoCodes.com — P1B37 Chevrolet Code - Battery Energy Control Module Hybrid Battery Voltage Balance Processor 4 Performance

What does this mean?

What are the Possible Causes of the DTC P1B37 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 P1B37 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 P1B37 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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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 P1B37 Chevrolet Code

1. What are common symptoms of OBDII code P1B37 in a Chevrolet related to the Battery Energy Control Module Hybrid Battery Voltage Balance Processor 4 Performance?

Symptoms may include poor hybrid battery performance, decreased fuel efficiency, difficulty starting the vehicle, and the illumination of the check engine light.

2. What are possible causes of OBDII code P1B37 in a Chevrolet?

Potential causes of this code may include issues with the hybrid battery, faults in the voltage balance processor, wiring problems, or software glitches in the Battery Energy Control Module.

3. How can I diagnose OBDII code P1B37 in my Chevrolet?

Diagnosis typically involves using an OBDII scanner to retrieve the specific code, conducting a visual inspection of the hybrid battery and related components, and performing electrical tests to check for voltage imbalances or abnormalities.

4. What repairs are commonly needed for OBDII code P1B37 in a Chevrolet?

Common repairs for this code may involve replacing faulty hybrid battery modules, repairing wiring connections, updating software in the Battery Energy Control Module, or resetting the voltage balance processor.

5. Can I continue driving my Chevrolet with OBDII code P1B37 present?

It is not recommended to drive the vehicle with this code active, as it can lead to further damage to the hybrid system and potentially cause safety hazards. It is best to address the issue promptly.

6. How urgent is it to fix OBDII code P1B37 in a Chevrolet?

While the severity of the issue may vary, it is generally recommended to address this code as soon as possible to prevent further complications and ensure the proper functioning of the hybrid system.

7. Are there any DIY tips for troubleshooting OBDII code P1B37 in a Chevrolet?

DIY troubleshooting tips may include checking the hybrid battery connections, inspecting for visible damage or corrosion, and ensuring all software updates for the hybrid system are current.

8. How much does it typically cost to repair OBDII code P1B37 in a Chevrolet?

Repair costs can vary depending on the specific issue causing the code and the extent of the repairs needed. It is advisable to consult with a qualified mechanic for an accurate estimate.

9. Can a faulty hybrid battery cause OBDII code P1B37 in a Chevrolet?

Yes, a malfunctioning hybrid battery or individual battery modules can contribute to the triggering of this OBDII code, especially if there are voltage imbalances or performance issues.

10. Is it possible to prevent OBDII code P1B37 from recurring in a Chevrolet?

Regular maintenance of the hybrid system, including monitoring battery health, keeping connections clean and secure, and addressing any warning signs promptly, can help prevent the recurrence of this code.