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OBD2 Body Control (B-Codes) Master Index

B-Codes are OBD2 body-system diagnostic trouble codes used to identify faults involving vehicle body electronics and related control systems. Depending on the vehicle manufacturer, B-Codes may involve Airbag/SRS, seatbelt pretensioners, occupant detection, Body Control Modules (BCM), instrument clusters, climate control, lighting, anti-theft systems, and other body-related circuits.

This B-Code Master Index organizes OBDSpark diagnostic guides by code range, making it easier to find the correct fault-code procedure and understand the systems commonly associated with each group.

Important: B-Code definitions and diagnostic procedures can vary significantly between manufacturers. Always verify the exact code description, wiring configuration, module designation, and test procedure for the specific vehicle.

B-Code Directory

Choose a range below to access the corresponding B-Code diagnostic guides.

B0001–B0100: Airbag & SRS Codes

This range commonly includes diagnostic information related to SRS, airbag deployment circuits, seatbelt pretensioners, occupant restraint systems, and related body safety components. Exact definitions depend on the vehicle manufacturer.

B0001
Diagnostic guide
B0002
Diagnostic guide
B0003
Diagnostic guide
B0004
Diagnostic guide
B0005
Diagnostic guide
B0087
Diagnostic guide

Only published OBDSpark guides should be linked from this directory. Additional codes can be added as their individual diagnostic pages are published.

B0101–B1000: Occupant Detection & Body Electronics

This section covers B-Codes associated with crash sensing, occupant classification, restraint-related electronics, body control functions, and other manufacturer-dependent body systems.

Browse published B0101–B1000 guides

As new OBDSpark diagnostic articles are published, their direct URLs can be added to this section.

B1001–B1300: BCM, Configuration & Power Supply

B-Codes in this range may involve Body Control Modules (BCM), module configuration, vehicle identification information, communication or programming issues, and module power supply circuits.

Browse published B1001–B1300 guides

Direct diagnostic links can be added here as the corresponding articles become available.

B1301–B1600: HVAC & Climate Control

This section is intended for B-Codes associated with climate-control electronics, solar sensors, temperature sensors, HVAC actuators, blower control, and related body-control functions.

Browse published B1301–B1600 guides

Diagnostic articles will be linked here as they are published.

B1601–B2000: Security, Immobilizer & Lighting

This range may include manufacturer-specific body faults involving immobilizer systems, security keys, anti-theft functions, lighting circuits, and related body electronics.

Browse published B1601–B2000 guides

Published OBDSpark articles can be added here using direct article URLs.

B2001+: Additional B-Codes

Higher-numbered B-Codes can be strongly manufacturer-dependent and may cover specialized body modules, control circuits, sensors, actuators, security systems, and other vehicle-specific functions.

OBDSpark B-Code coverage

This section will expand as additional B-Code diagnostic guides are published.

How to Diagnose a B-Code

A B-Code should not be diagnosed from the code description alone. A professional diagnostic process should consider the vehicle manufacturer, module reporting the fault, freeze-frame information, wiring diagrams, power and ground circuits, communication status, and live data where available.

1. Identify the module
Determine which control module stored the B-Code.
2. Check the exact definition
Confirm the manufacturer's description for the vehicle.
3. Inspect power & ground
Check relevant fuses, grounds, connectors and supply voltage.
4. Check wiring & signals
Test the circuit according to the manufacturer's diagnostic procedure.
5. Use live data
Compare sensor or module values with expected operating conditions.
6. Clear & verify
After repair, clear the code and confirm that the fault does not return.

Generic vs Manufacturer-Specific B-Codes

Not every B-Code has a universal definition across all vehicles. Some codes may be standardized, while others are Manufacturer-Specific and can have different meanings between Toyota, Lexus, Ford, GM, Chrysler, Honda, Nissan, BMW, Mercedes-Benz, and other manufacturers.

Diagnostic warning: Never replace an airbag, BCM, sensor, or other component solely because a B-Code appears in the scan report. Confirm the circuit, module data, wiring, power supply, and manufacturer-specific diagnostic procedure first.

Related OBD2 Diagnostic Indexes

P-Codes
Powertrain diagnostic trouble codes
C-Codes
Chassis and ABS-related diagnostic codes
U-Codes
Network and communication faults
OBD2 Diagnostics
Scanning, live data and fault-code diagnosis

Frequently Asked Questions

What are B-Codes in OBD2?

B-Codes are diagnostic trouble codes associated primarily with vehicle body systems. Depending on the vehicle, they can involve SRS, airbags, seatbelts, BCMs, climate control, lighting, security, and other body electronics.

Are all B-Codes universal?

No. Some B-Codes may be standardized, while many are Manufacturer-Specific. The exact meaning should always be verified for the particular vehicle and control module.

Can a B-Code identify the failed component?

Not necessarily. A diagnostic trouble code identifies a detected fault or abnormal condition. Proper diagnosis may require circuit testing, live data, voltage measurements, wiring inspection, or manufacturer-specific procedures.

Why is my B-Code still present after replacing a component?

The original fault may be caused by wiring, connectors, power supply, ground, communication, configuration, or another related component. Some systems may also require calibration, initialization, or programming after component replacement.

OBDSpark — OBD2 Diagnostic Trouble Codes, Automotive Diagnostics & Repair Guides

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