B-Code (BOD-II) Diagnostic Reference Guide

This guide provides a detailed breakdown of B-Codes (B00E1-B00E8), which pertain to Body Control Module (BCM) and Occupant Detection System (ODS) faults in modern vehicles. These codes typically involve:

• • Seat weight/position sensors (B00E1-B00E6)
  • Airbag/occupant classification system (B00E5, B00E8)
  • Calibration/data errors (B00E4, B00E7)

Impact:

• • 🔴 Critical codes (e.g., B00E5) may disable airbags, requiring immediate attention.
  • 🟠 High-priority codes affect safety systems (e.g., faulty seat sensors).
  • 🟡 Medium-priority codes may cause incorrect airbag deployment but aren’t immediate failures.

Use Case:
Helps technicians diagnose issues with passenger detection, seat sensors, and airbag readinesswhile prioritizing repairs based on severity.

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Key Features of This Guide:

1. 1. Color-Coded Severity Levels – Quickly identify urgent vs. non-urgent repairs.
   2. Clear Descriptions – Explains what each code means in plain terms.
   3. Possible Causes – Lists common faults (wiring, sensor failure, calibration errors).
   4. Actionable Insights – Recommends fixes like sensor replacement or system recalibration.

Ideal For: Automotive technicians, DIYers, and service manuals needing a concise B-Code reference.

Body Control Module (BCM) DTC Reference Table

(Color Key: 🔴 Critical | 🟠 High | 🟡 Medium | 🔵 Low)

DTC Code	Severity	Description	Possible Causes
B0001	🟠 High	Driver Frontal Stage 1 Deployment Control	Faulty airbag, wiring issue, impact sensor malfunction
B0002	🔴 Critical	Driver Frontal Stage 2 Deployment Control	Airbag circuit failure, SDM module fault
B0003	🟠 High	Passenger Frontal Stage 1 Deployment Control	Occupant sensor fault, wiring harness issue
B0004	🔴 Critical	Passenger Frontal Stage 2 Deployment Control	Airbag module failure, crash sensor error
B0005	🟠 High	Driver Knee Bolster Deployment Control	Knee airbag circuit fault, connector issue
B0010	🔴 Critical	Passenger Side Deployment Control (Stage 1)	Side impact sensor failure, wiring short
B0011	🔴 Critical	Passenger Side Deployment Control (Stage 2)	Airbag inflator fault, module communication error
B0012	🟠 High	Driver Side Deployment Control (Stage 1)	Seat harness issue, impact sensor fault
B0013	🔴 Critical	Driver Side Deployment Control (Stage 2)	Side airbag circuit failure, SDM fault
B0020	🟠 High	Left Curtain Deployment Control (Stage 1)	Curtain airbag connector issue, wiring fault
B0021	🔴 Critical	Left Curtain Deployment Control (Stage 2)	Airbag inflator failure, module configuration error
B0022	🟠 High	Right Curtain Deployment Control (Stage 1)	Roof rail sensor fault, wiring damage
B0028	🟡 Medium	Seat Belt Pretensioner Deployment Control (Left)	Pretensioner circuit fault, connector corrosion
B0029	🟡 Medium	Seat Belt Pretensioner Deployment Control (Right)	Pretensioner squib resistance out of range
B002A	🟠 High	Center Curtain Deployment Control	Sensor misalignment, wiring short to ground
B0030	🟠 High	Seat Occupant Detection System Fault	Weight sensor failure, mat sensor damage
B0031	🟡 Medium	Passenger Presence System (PPS) Fault	Faulty PPS module, calibration required
B0032	🟠 High	Child Seat Detection System Malfunction	Sensor contamination, wiring issue
B0033	🟡 Medium	Occupant Classification System Error	System calibration needed, sensor fault
B0038	🟠 High	Side Impact Sensor (Left Front) Communication Fault	Sensor unplugged, CAN bus communication error
B0039	🟠 High	Side Impact Sensor (Right Front) Communication Fault	Wiring damage, sensor internal failure
B003A	🟠 High	Side Impact Sensor (Left Rear) Communication Fault	Connector issue, sensor misalignment
B003B	🟠 High	Side Impact Sensor (Right Rear) Communication Fault	Power supply issue, sensor configuration error
B0040	🔴 Critical	Restraints Control Module Internal Fault	Internal SDM failure, requires replacement
B0041	🔴 Critical	Restraints Control Module Configuration Error	Incorrect programming, software version mismatch
B0042	🟠 High	Restraints System Voltage Low	Charging system fault, low battery voltage
B0043	🟠 High	Restraints System Voltage High	Alternator overcharging, voltage regulator fault
B0048	🟠 High	Driver Seat Position Sensor Fault	Sensor unplugged, wiring harness damage
B0049	🟠 High	Passenger Seat Position Sensor Fault	Sensor calibration needed, mechanical binding
B004A	🟡 Medium	Driver Seat Belt Buckle Switch Fault	Switch failure, wiring short to ground
B004B	🟡 Medium	Passenger Seat Belt Buckle Switch Fault	Connector issue, switch internal failure
B0050	🟠 High	Driver Airbag Squib Circuit Open	Clock spring failure, wiring break
B0051	🟠 High	Driver Airbag Squib Circuit Short to Ground	Wiring harness damage, airbag connector corrosion
B0052	🟠 High	Driver Airbag Squib Circuit Short to Battery	Wiring short to power, module fault
B0053	🟠 High	Driver Airbag Squib Circuit Resistance Low	Faulty airbag, incorrect component installed
B0054	🟠 High	Driver Airbag Squib Circuit Resistance High	High resistance in circuit, poor connection
B0055	🟠 High	Passenger Airbag Squib Circuit Open	Connector unplugged, wiring break
B0056	🟠 High	Passenger Airbag Squib Circuit Short to Ground	Wiring harness damage, airbag fault
B0057	🟠 High	Passenger Airbag Squib Circuit Short to Battery	Short to power, module internal fault
B0058	🟠 High	Passenger Airbag Squib Circuit Resistance Low	Faulty airbag, incorrect component
B0060	🟠 High	Left Side Airbag Squib Circuit Open	Wiring break, connector issue
B0061	🟠 High	Right Side Airbag Squib Circuit Open	Harness damage, airbag connector fault
B0070	🔴 Critical	Driver Seatbelt Sensor Circuit Malfunction	Faulty sensor, wiring short/open, BCM issue
B0071	🔴 Critical	Passenger Seatbelt Sensor Circuit Malfunction	Sensor failure, damaged wiring, poor connection
B0072	🟠 High	Left Side Impact Sensor Circuit Low Voltage	Low power supply, sensor fault, wiring issue
B0073	🟠 High	Left Side Impact Sensor Circuit High Voltage	Short to power, sensor failure
B0074	🟠 High	Right Side Impact Sensor Circuit Low Voltage	Wiring fault, poor ground, sensor malfunction
B0075	🟠 High	Right Side Impact Sensor Circuit High Voltage	Short to battery, sensor defect
B0076	🔴 Critical	Front Impact Sensor #1 Circuit Malfunction	Crash sensor failure, wiring damage
B0077	🔴 Critical	Front Impact Sensor #2 Circuit Malfunction	Sensor misalignment, communication error
B0078	🟠 High	Airbag Squib Circuit (Driver Side) Open	Broken clock spring, wiring break, faulty airbag
B0079	🟠 High	Airbag Squib Circuit (Passenger Side) Open	Disconnected connector, airbag fault
B007A	🟠 High	Side Airbag Circuit (Left) Resistance Low	Short circuit, damaged squib
B007B	🟠 High	Side Airbag Circuit (Right) Resistance High	High resistance in wiring, poor connection
B007C	🔴 Critical	Seat Occupancy Sensor Circuit Malfunction	Faulty sensor, wiring issue, BCM error
B007D	🟡 Medium	Seat Position Sensor Circuit Range/Performance	Sensor misalignment, calibration needed
B007E	🟠 High	Pedestrian Impact Sensor Signal Invalid	Sensor damage, wiring fault
B007F	🟠 High	Restraint System Communication Bus Off	CAN bus fault, module failure
B0080	🔴 Critical	Airbag Deployment Commanded	Crash detected, system locked (post-accident)
B0081	🟠 High	Airbag Disabled Indicator Circuit Malfunction	Faulty indicator, wiring short
B0082	🟠 High	Seatbelt Pretensioner Circuit (Driver) Open	Pretensioner fault, wiring break
B0083	🟠 High	Seatbelt Pretensioner Circuit (Passenger) Short	Short to ground, pretensioner failure
B0084	🟡 Medium	Roof Airbag Circuit Resistance Out of Range	High resistance, connector corrosion
B0085	🟠 High	Knee Airbag Circuit (Driver) Malfunction	Wiring issue, airbag fault
B0086	🟠 High	Knee Airbag Circuit (Passenger) Malfunction	Short circuit, squib failure
B0087	🟡 Medium	Seatbelt Buckle Switch Circuit Invalid Signal	Faulty switch, misalignment
B0088	🟠 High	Restraint System Power Supply Low Voltage	Weak battery, faulty power supply circuit
B0090	🔴 Critical	SRS Warning Lamp Circuit Malfunction	Bulb failure, wiring short, BCM issue
B0091	🟠 High	Event Data Recorder Communication Error	EDR module fault, CAN bus issue
B0092	🟠 High	Passenger Airbag Disable Switch Circuit Fault	Switch failure, wiring short/open
B0093	🟡 Medium	Child Seat Detection Sensor Circuit Malfunction	Sensor dirty, wiring issue
B0094	🟠 High	Occupant Classification System (OCS) Error	Faulty OCS sensor, calibration needed
B0095	🔴 Critical	Restraint System Configuration Mismatch	Incorrect module programming, replaced parts
B0096	🟠 High	Crash Data Stored (Non-Deployment Event)	Minor impact detected, system requires reset
B00A0	🟠 High	Seatbelt Anchor Pretensioner Circuit Fault	Pretensioner failure, wiring issue
B00B0	🟡 Medium	Left Side Impact Sensor Communication Error	Loose connector, sensor fault
B00B1	🟡 Medium	Right Side Impact Sensor Communication Error	Wiring damage, sensor malfunction
B00C0	🟠 High	Airbag Module (Driver) Internal Fault	Internal short, module replacement needed
B00D0	🟠 High	Restraint System Sensor Power Supply Fault	Blown fuse, wiring short
B00E0	🔴 Critical	Restraint System ECU Hardware Failure	Internal ECU fault, requires replacement
B00E1	🟠 High	Occupant Classification System (OCS) Sensor Malfunction	Faulty OCS sensor, wiring issue, seat mat damage
B00E2	🟠 High	Passenger Seat Weight Sensor Circuit Low	Short to ground, sensor failure, poor connection
B00E3	🟠 High	Passenger Seat Weight Sensor Circuit High	Short to power, sensor fault, wiring damage
B00E4	🟡 Medium	Occupant Classification System Calibration Error	Incorrect calibration, sensor misalignment
B00E5	🔴 Critical	Occupant Detection System Failure (Airbag Light ON)	OCS module failure, wiring fault, BCM error
B00E6	🟠 High	Passenger Seat Position Sensor Circuit Malfunction	Sensor unplugged, wiring short, seat track issue
B00E7	🟡 Medium	Occupant Classification System Signal Noise	Loose connector, EMI interference, weak sensor signal
B00E8	🟠 High	Occupant Classification System Invalid Data	Corrupted sensor data, BCM communication error

Severity Key:

• • 🔴 Critical: Immediate safety risk (airbag may not deploy)
  • 🟠 High: Safety system impaired (needs prompt attention)
  • 🟡 Medium: Reduced system functionality (should be addressed soon)
  • 🔵 Low: Non-critical fault (may only affect warning lights)

📚 B1000+ Series Body System DTCs

Color Key: 🔴 Critical | 🟠 High | 🟡 Medium | 🔵 Low)

DTC Code	Severity	Description	Possible Causes
B1000	🔴 Critical	Airbag Control Module (ACM) Internal Fault	ACM hardware failure, crash data corruption
B1001	🟠 High	Driver Airbag Circuit Low Resistance	Short in wiring, faulty clock spring
B1002	🟠 High	Driver Airbag Circuit High Resistance	Open circuit, disconnected airbag
B1003	🟠 High	Passenger Airbag Circuit Low Resistance	Wiring short, damaged airbag module
B1010	🟠 High	Seat Belt Pretensioner Circuit Malfunction	Faulty pretensioner, wiring issue
B1020	🟡 Medium	Side-Impact Airbag (SIR) Circuit Resistance Low	Short circuit in side airbag wiring
B1030	🟠 High	Airbag System Voltage Low	Weak battery, faulty ACM power supply
B1100	🟡 Medium	Seat Memory Position Sensor Fault	Stuck switch, motor failure
B1200	🔵 Low	Interior Light Control Circuit Malfunction	Blown fuse, faulty BCM
B1300	🟡 Medium	Door Lock Actuator Circuit Failure	Actuator motor failure, wiring issue
B1400	🟠 High	Fuel Door Release Circuit Malfunction	Stuck actuator, wiring short
B1500	🟡 Medium	Horn Control Circuit Failure	Faulty horn relay, clock spring issue
B1600	🔴 Critical	Anti-Theft System (Immobilizer) Malfunction	Key transponder fault, antenna issue
B2100	🟠 High	Tire Pressure Monitor (TPM) System Fault	Failed sensor, receiver module issue
B2200	🟡 Medium	Rain Sensor Circuit Malfunction	Dirty windshield, faulty sensor
B2300	🔵 Low	Ambient Light Sensor Circuit Failure	Sensor unplugged, wiring damage

Severity Breakdown

• • 🔴 Critical (B1000, B1600): Disables safety systems (airbags/immobilizer).
  • 🟠 High (B1001-B1030, B1400): Impacts airbags, seatbelts, or security.
  • 🟡 Medium (B1020, B1300): Comfort/convenience system faults.
  • 🔵 Low (B1200, B2300): Non-safety related (lights/sensors).

Troubleshooting Tips

1. Airbag Codes (B1000-B1030):
   • Check clock spring and wiring harnesses.
   • Never probe airbag circuits with power applied!
2. Immobilizer (B1600):
   • Reprogram keys or replace antenna ring.
3. Seat/Memory (B1100):
   • Recalibrate position sensors.
4. TPMS (B2100):
   • Relearn tire sensors or replace faulty units.

📚 B2000+ Series Body System DTCs

Color Key: 🔴 Critical | 🟠 High | 🟡 Medium | 🔵 Low | ⚪ Info)

DTC Code	Severity	Description	Possible Causes	UNIQUE FIXES
B2000	🟠 High	Adaptive Headlight System Failure	Stepper motor fault, level sensor issue
B2101	🟡 Medium	Lane Departure Warning (LDW) Camera Malfunction	Misaligned camera, dirty windshield
B2200	🟠 High	Blind Spot Detection (BSD) Radar Fault	Sensor misalignment, wiring damage
B2222	⚪ Info	Head-Up Display (HUD) Communication Error	Loose connector, graphics module fault
B2300	🟠 High	Automatic Emergency Braking (AEB) System Offline	Dirty radar/camera, module software bug
B2400	🟡 Medium	Power Tailgate Position Sensor Fault	Stripped gears, sensor misalignment
B2500	🔴 Critical	Electronic Parking Brake (EPB) Actuator Failure	Motor seizure, control module fault
B2600	🟠 High	360° Camera System Image Distortion	Water intrusion, lens calibration needed
B2700	🟡 Medium	Massage Seat Motor Circuit Short	Pinched wires, failed motor
B2800	🟠 High	Night Vision System IR Camera Fault	Condensation, power supply issue
B2900	🔵 Low	Ambient Air Quality Sensor Drift	Contaminated sensor, needs recalibration
B3000	🟠 High	Trailer Hitch Control Module Communication Loss	CAN bus dropout, module failure
B3001	🔴 Critical	High-Voltage Battery Contactor Stuck Open	Contactor welding, BMS fault	Requires HV system shutdown
B3100	🟠 High	Battery Preconditioning Heater Failure	PTC heater fault, coolant flow issue	Check thermal mgmt. valves
B3150	🟡 Medium	DC Fast Charging Communication Error	CCS Combo port damage, charger mismatch	Update charger firmware
B3200	🟠 High	Autonomous Driving Camera Sync Loss	Timeout between front/side cameras	Recalibrate sensor fusion
B3250	🔴 Critical	LiDAR Obstacle Detection Blind Spot	Dirty sensor, alignment shift	De-ice/reset LiDAR housing
B3300	🟠 High	Dynamic Air Suspension Height Fault	Leaking bag, compressor overload	Disable load-leveling mode
B3350	🟡 Medium	Vehicle-to-Grid (V2G) Handshake Fail	Grid incompatibility, onboard charger fault	ISO 15118 protocol reset
B3400	🟠 High	Regenerative Braking Torque Mismatch	Inverter communication error	Relearn brake blending curve
B3500	🔴 Critical	Motor Controller Overtemperature	Coolant pump failure, rotor sensor fault	Derate power to 50%
B3600	⚪ Info	Cabin UV Sanitization Cycle Aborted	Door opened during cycle	Reset hygiene mode
B3700	🟠 High	Solid-State Battery SoC Calibration Drift	Cell balancing fault	Deep discharge/recharge cycle
B3800	🔴 Critical	Autonomous Emergency Steering Fault	EPS motor overload, map data conflict	Override requires scan tool

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System-Specific Insights

1. ADAS Codes (B2101-B2300)
   • Calibration Required after windshield replacement (LDW/AEB cameras).
   • BSD radar misalignment often occurs after bumper repairs.
2. Lighting (B2000)
   • Adaptive headlight failures may trigger “Dipped Beam Only” failsafe mode.
3. Parking Brake (B2500)
   • Emergency release procedure may be needed to move vehicle.
4. Night Vision (B2800)
   • Common in luxury vehicles – check for firmware updates first.

📚 B3000+ Series Body System DTCs

B3001	🔴 Critical	High-Voltage Battery Contactor Stuck Open	Contactor welding, BMS fault	Requires HV system shutdown
B3100	🟠 High	Battery Preconditioning Heater Failure	PTC heater fault, coolant flow issue	Check thermal mgmt. valves
B3150	🟡 Medium	DC Fast Charging Communication Error	CCS Combo port damage, charger mismatch	Update charger firmware
B3200	🟠 High	Autonomous Driving Camera Sync Loss	Timeout between front/side cameras	Recalibrate sensor fusion
B3250	🔴 Critical	LiDAR Obstacle Detection Blind Spot	Dirty sensor, alignment shift	De-ice/reset LiDAR housing
B3300	🟠 High	Dynamic Air Suspension Height Fault	Leaking bag, compressor overload	Disable load-leveling mode
B3350	🟡 Medium	Vehicle-to-Grid (V2G) Handshake Fail	Grid incompatibility, onboard charger fault	ISO 15118 protocol reset
B3400	🟠 High	Regenerative Braking Torque Mismatch	Inverter communication error	Relearn brake blending curve
B3500	🔴 Critical	Motor Controller Overtemperature	Coolant pump failure, rotor sensor fault	Derate power to 50%
B3600	⚪ Info	Cabin UV Sanitization Cycle Aborted	Door opened during cycle	Reset hygiene mode
B3700	🟠 High	Solid-State Battery SoC Calibration Drift	Cell balancing fault	Deep discharge/recharge cycle
B3800	🔴 Critical	Autonomous Emergency Steering Fault	EPS motor overload, map data conflict	Override requires scan tool

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Key Technology Breakdown

1. Battery Systems (B3001-B3150)

   • Unique Risk: B3001 may strand vehicle if contactors won’t close.
   • Pro Tip: B3100 often triggers in sub-zero temps before cabin preheat.

2. Autonomous Driving (B3200-B3250)

   • Requires sensor fusion calibration (costs $300-$800 at dealers).
   • B3250 common after front-end collisions.

3. Charging/Energy (B3350-B3700)

   • B3350 V2G failures increasing with bidirectional charger adoption.
   • B3700 affects early solid-state battery vehicles (e.g., 2025+ models).\

Emerging Codes (2024+ Models)

• • B3900: AI Co-Pilot Personality Module CRC Error (Tesla “Chat Mode” failures)
  • B3950: Holographic HUD Laser Diode Degradation (Mercedes MBUX issues)
  • B3999: Quantum Encryption Key Sync Failure (Cybersecurity lockout)

Did You Know?

• • B3400 often appears after brake pad replacements until the system relearns.
  • B3600 UV sanitization cycles run automatically in some taxis after ride completion.

(Example: “B3500 motor controller faults typically require 3.5hrs diag + HV training certification.”)

Check Also

🔗 Understanding U-Codes: Vehicle Communication Network Diagnostics

🔗 Understanding C-Code