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B Code OBD-II Codes Explained: Complete Guide to Body Diagnostic Trouble Codes

Illustration of an OBD-II scanner displaying a B-series Body diagnostic trouble code with a vehicle highlighting the airbag system, Body Control Module, crash sensors, and seat belt pretensioners.

If your scan tool has displayed a B code, you’re dealing with a problem in your vehicle’s Body Control Systems rather than the engine or transmission. While P codes (Powertrain) receive most of the attention, Body (B) OBD-II diagnostic trouble codes are just as important because they affect the safety, comfort, convenience, and electronic systems modern vehicles rely on every day.

Body codes can indicate faults in the airbag system (SRS), seat belt pretensioners, occupant detection sensors, lighting systems, power windows, door locks, HVAC controls, body control modules (BCM), and dozens of other electronically controlled components.

Whether your Airbag Warning Light has illuminated or you’re troubleshooting a body electronics problem, this guide explains everything you need to know about B-series OBD-II codes, how they work, and where to find detailed repair information for each individual code.

What Are B Codes?

OBD-II diagnostic trouble codes are divided into four categories:

PrefixSystem
PPowertrain
BBody
CChassis
UNetwork & Communication

B Codes diagnose faults in electronic body systems including:

Unlike engine codes, many Body codes require a professional scan tool capable of communicating with manufacturer-specific modules.

Common Symptoms of a B Code

Symptoms vary depending on the affected system but may include:

Some Body codes affect convenience features, while others disable critical safety systems.

Are B Codes Serious?

Some are relatively minor.

Others are extremely serious.

For example:

Low Severity

Moderate Severity

High Severity

If your Airbag Warning Light is illuminated, the SRS may not deploy correctly during an accident.

Can You Drive With a B Code?

That depends on the affected system.

Generally:

✅ Window switch fault — Yes

✅ Power door lock issue — Yes

⚠️ Airbag fault — Not recommended

⚠️ Seat belt pretensioner fault — Repair immediately

⚠️ Crash sensor fault — Repair immediately

Never ignore any SRS-related B code.

How Are B Codes Diagnosed?

Proper diagnosis usually involves:

  1. Reading Body codes with an advanced scan tool
  2. Accessing manufacturer-specific subcodes
  3. Reviewing live sensor data
  4. Inspecting wiring and connectors
  5. Testing Body Control Module inputs
  6. Following factory service procedures

Many inexpensive code readers cannot access Body Control Modules.

Most Common B Code Categories

Airbag (SRS)

Seat Belt Systems

Occupant Detection

Lighting

BCM

Comfort Systems

Complete B Code Library

Below are the Body codes currently covered on Pro Street.

B0001–B0099

CodeDescription
B0001Driver Frontal Stage 1 Deployment Control
B0002Driver Frontal Stage 1 Deployment Loop Open
B0004Driver Frontal Stage 1 Deployment Loop Short
B0010Passenger Frontal Airbag Circuit
B0012Passenger Frontal Deployment Loop
B0020Left Side Airbag Deployment Control
B0022Left Side Airbag Deployment Loop Resistance
B0028Right Side Airbag Deployment Loop Resistance
B0033Driver Seat Belt Pretensioner Circuit
B0040Left Front Impact Sensor Circuit
B0041Left Front Impact Sensor Performance
B0045Right Front Impact Sensor Performance
B0050Driver Seat Belt Sensor Circuit
B0051Passenger Seat Belt Sensor Circuit
B0052Passenger Seat Belt Pretensioner Circuit
B0053Driver Seat Belt Pretensioner Deployment Control
B0054Passenger Pretensioner Deployment Loop
B0055Passenger Pretensioner Resistance Low
B0056Driver Pretensioner Deployment Loop Resistance
B0057Driver Pretensioner Resistance Low
B0058Passenger Pretensioner Resistance Low
B0059Driver Pretensioner Resistance High
B0060Passenger Pretensioner Resistance High
B0061Driver Airbag Stage 1 Resistance High
B0062Passenger Airbag Stage 1 Resistance High
B0063Driver Airbag Stage 1 Open Circuit
B0064Passenger Airbag Stage 1 Open Circuit
B0065Driver Airbag Stage 2 Circuit
B0066Passenger Airbag Stage 2 Circuit
B0067Driver Airbag Stage 2 Resistance Low
B0068Passenger Airbag Stage 2 Resistance Low
B0069Driver Airbag Stage 2 Resistance High
B0070Passenger Airbag Stage 2 Resistance High
B0071Driver Airbag Stage 2 Open Circuit
B0072Passenger Airbag Stage 2 Open Circuit
B0073Driver Knee Airbag Circuit
B0074Passenger Knee Airbag Circuit
B0075Driver Knee Airbag Resistance Low
B0076Passenger Knee Airbag Resistance Low
B0077Driver Knee Airbag Resistance High
B0078Passenger Knee Airbag Resistance High
B0079Driver Knee Airbag Open Circuit
B0080Passenger Knee Airbag Open Circuit
B0081Driver Frontal Deployment Loop Stage 2
B0082Passenger Frontal Deployment Loop Stage 2
B0083Driver Frontal Deployment Loop Stage 2 Resistance Low
B0084Passenger Frontal Deployment Loop Stage 2 Resistance Low
B0085Driver Frontal Deployment Loop Stage 2 Resistance High
B0086Passenger Frontal Deployment Loop Stage 2 Resistance High
B0087Driver Frontal Deployment Loop Stage 2 Open Circuit
B0088Driver Frontal Deployment Loop Stage 2 Performance
B0089Left Side Airbag Resistance Low
B0090Right Side Airbag Resistance Low
B0091Left Side Airbag Resistance High
B0092Right Side Airbag Resistance High
B0093Left Side Airbag Open Circuit
B0094Right Side Airbag Open Circuit
B0095Right Frontal Restraints Sensor
B0096Left Frontal Restraints Sensor
B0097Right Frontal Restraints Sensor Performance
B0098Left Frontal Restraints Sensor Performance
B0099Passenger Presence System

New B-code guides are added regularly, with additional Body Control Module, lighting, HVAC, seat, and convenience system diagnostics planned.

Why B Codes Are Increasingly Common

Modern vehicles contain 50–100+ electronic control modules, each monitoring hundreds of sensors. As more safety and comfort features become computerized, Body codes have become significantly more common than they were just a decade ago.

Advanced systems such as:

all rely on Body Control Modules and SRS components that can trigger B-series diagnostic trouble codes.

Final Thoughts

Body diagnostic trouble codes may not affect how your engine runs, but they often impact the systems that protect you and your passengers. From airbag deployment circuits and crash sensors to occupant classification systems and Body Control Modules, understanding B-series OBD-II codes is essential for proper diagnosis and safe vehicle operation.

Our growing library of detailed repair guides covers each code individually, including common causes, symptoms, diagnostic procedures, repair costs, and frequently asked questions to help you identify and fix the problem with confidence.

Bookmark this page and check back regularly as we continue expanding the most comprehensive B-code library available.

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