B02A6

Code

Generic B — Body

Airbag Control Module Internal Fault

Brand: Generic

Type: B — Body

Views: UK: 0 EN: 2 RU: 2

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty/damaged airbag (SRS) control module
Corroded or loose connector(s) at the module
Low or unstable battery/ignition voltage or poor ground
Water ingress or physical damage to module or wiring
Software corruption or failed module self-test
Interrupted CAN/SRS communication (bus fault, short, open)

Symptoms

Airbag/SRS warning lamp illuminated or flashing on dash
Supplemental restraint systems (airbags/pretensioners) disabled or inhibited
Inability to communicate fully with the SRS module using scan tools
Multiple SRS-related DTCs present
Vehicle may fail safety checks for SRS readiness

What to check

Record all SRS codes and freeze/frame/crash data before clearing
Observe manufacturer SRS safety procedures (battery disconnect/wait time) prior to disconnecting connectors
Visually inspect module and connector for corrosion, water ingress, impact damage or bent pins
Check battery state of charge and charging system; verify stable ~12–14 V with key on during diagnostics
Scan CAN/SRS network for communication errors and related DTCs
Verify ground connection(s) for the SRS module and continuity to chassis

Signal parameters

Module supply voltage (B+) with ignition ON — expected ~11–15 V
Module ground continuity to chassis
CAN/LIN bus activity to/from SRS module (bus traffic present, error counters)
Module internal self-test/fault flags or watchdog status (if readable)
Stored crash event count or deployment flags
SRS readiness status (system OK / inhibited)

Diagnostic algorithm

Connect a diagnostic scan tool and record all SRS-related DTCs, module ID, software version and crash data. Do not clear crash data until documented.
Check battery voltage and charging system. Recharge or replace battery if voltage is low or unstable; re-test.
Visually inspect the SRS module, harness and connectors for corrosion, water ingress, impact damage, bent pins or burnt traces. Repair wiring or connector faults as needed.
Verify module grounds and B+ feed at the module connector. Repair any poor connections and re-test.
Check CAN/SRS network communication. If bus errors exist, isolate and repair wiring or short/open circuits before addressing module internals.
If hardware and wiring are good, attempt to re-flash or update module software per manufacturer procedures. Use OEM tool and verified software only.
If reflash fails or internal faults persist, replace the SRS control module with a new or known-good unit. Ensure proper vehicle-specific module coding or programming and initialize SRS/airbag system per OEM procedure.
After repair or replacement, clear codes, perform SRS self-test, and verify the airbag indicator goes out and no B02A6 or related codes return. Confirm system readiness and, if required, perform diagnostic test drives or static system tests.

Likely causes

Internal hardware failure inside the SRS module (processor, memory, watchdog)
Corrosion or broken pins at the module connector causing intermittent contact
Battery voltage drop or excessive transients during module self-test
Module software corruption requiring reflash or replacement
Stored crash event data preventing normal module operation

Fault status

⚠️ Status

Airbag control module reports an internal fault. SRS lamp illuminated; module may be non-operational or intermittently communicate. Inspection of module, power/ground, connectors, and network required. Reflash or module replacement may be necessary.

🔴 Repair difficulty: Hard

⏱️ Diagnostic time: 2-4 hours