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Engine-Codes – Generic – P0B37

P0B37 Code - High Voltage Service Disconnect Open

Quick Answer

The P0B37 code indicates that there is a high voltage service disconnect open in the vehicle's electrical system. Common causes include Faulty high voltage service disconnect switch, Wiring issues or short circuits in the high voltage system, Corrosion or damage to electrical connections. 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
P0B37 indicates High Voltage Service Disconnect Open.
Common causes
Common causes include Faulty high voltage service disconnect switch, Wiring issues or short circuits in the high voltage system, Corrosion or damage to electrical connections.
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.
What is this?
Table of contents Created and updated by William Orellana on Aug 18, 2024
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Code P0B37 Description

The P0B37 code indicates that there is a high voltage service disconnect open in the vehicle's electrical system. This means that there is a break in the circuit that controls the high voltage system, which is critical for the operation of hybrid or electric vehicles. The high voltage service disconnect is designed to safely isolate the high voltage system from the rest of the vehicle to prevent electric shock or other hazards. If this disconnect is open, it can prevent the high voltage system from functioning properly, leading to potential safety issues and poor vehicle performance.

OBDII Code P0B37 - High Voltage Service Disconnect Open
P0B37 Code - High Voltage Service Disconnect Open

Common Causes of P0B37

  1. Faulty high voltage service disconnect switch
  2. Wiring issues or short circuits in the high voltage system
  3. Corrosion or damage to electrical connections
  4. Issues with the high voltage battery pack
  5. Malfunctioning control module

Symptoms of P0B37

  1. Check engine light illuminated
  2. Loss of power or acceleration
  3. Vehicle may not start
  4. Inability to switch between electric and gasoline modes (for hybrid vehicles)
  5. Decreased fuel efficiency

How to Fix P0B37

  1. Perform a thorough inspection of the high voltage system to locate the open disconnect
  2. Test the high voltage service disconnect switch and wiring for continuity
  3. Repair or replace any damaged wiring or connections
  4. Reset the fault code and test the system to ensure proper operation
  5. If necessary, replace the high voltage service disconnect switch or control module

Cost to Fix P0B37

The cost of repairing a high voltage service disconnect open issue can vary depending on the specific cause of the problem and the extent of the repairs needed. On average, you can expect to pay anywhere from $200 to $800 for parts and labor. However, as mentioned earlier, labor rates can vary significantly, so it's best to get a few quotes from local auto repair shops to get a more accurate estimate.

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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 P0B37 Code

1. What are the common symptoms of OBDII code P0B37 (High Voltage Service Disconnect Open)?

The common symptoms include the inability to start the vehicle, loss of power while driving, and the illumination of the check engine light.

2. What are the possible causes of OBDII code P0B37 (High Voltage Service Disconnect Open)?

Potential causes include a faulty high voltage service disconnect switch, damaged wiring or connectors in the high voltage system, or a malfunctioning battery management system.

3. How can I diagnose OBDII code P0B37 (High Voltage Service Disconnect Open)?

Diagnosis typically involves using a scan tool to retrieve the code, inspecting the high voltage service disconnect switch and related components for damage, and testing the wiring and connectors for continuity.

4. Can I continue driving with OBDII code P0B37 (High Voltage Service Disconnect Open) present?

It is not recommended to continue driving with this code active, as it may lead to further damage to the high voltage system and potentially pose a safety risk.

5. How can I repair OBDII code P0B37 (High Voltage Service Disconnect Open)?

Repairing the issue may involve replacing the high voltage service disconnect switch, repairing or replacing damaged wiring or connectors, or addressing any underlying issues with the battery management system.

6. Is it safe to attempt repairs for OBDII code P0B37 (High Voltage Service Disconnect Open) on my own?

Due to the high voltage nature of the system, it is recommended to have repairs for this code performed by a qualified technician with experience in handling hybrid or electric vehicles.

7. Will resetting the fault codes clear OBDII code P0B37 (High Voltage Service Disconnect Open)?

Simply resetting the fault codes may temporarily clear the code, but it is crucial to address the underlying issue causing the fault code to prevent it from reoccurring.

8. How can I prevent OBDII code P0B37 (High Voltage Service Disconnect Open) from happening again in the future?

Regular maintenance and inspections of the high voltage system, including the service disconnect switch and associated components, can help prevent this code from reoccurring.

9. Is OBDII code P0B37 (High Voltage Service Disconnect Open) specific to certain vehicle makes and models?

This code is commonly found in hybrid or electric vehicles that utilize a high voltage system, so it may be specific to certain makes and models equipped with such technology.

10. Can OBDII code P0B37 (High Voltage Service Disconnect Open) be a safety concern for the driver and passengers?

Yes, this code can indicate a problem with the high voltage system, which can pose safety risks if not addressed promptly. It is important to have the issue diagnosed and repaired as soon as possible.

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