Damaged, corroded or loose connector at the right seat or right side airbag, often from seat movement or underseat wiring chafe; Open circuit, short to ground or short to voltage in the right side airbag wiring or clockspring-type connection (depends on airbag location); Faulty right side airbag module or initiator (high or low resistance); Poor repair after previous collision, trim removal or seat work, such as a connector not fully seated or a wrongly fitted part; Water ingress or corrosion in the door, pillar or underseat area affecting the circuit; Faulty restraint control module or internal driver fault.

B0028

Right Side Airbag Deployment Control.

Generic
Body
Generic code
High severity

How this code is built

B: SystemBody
0: Defined bySAE, the same on every car
0: AreaBody area 0
28: FaultThe specific fault in that area

What it means

B0028 is the generic SAE J2012 code for a fault in the right side airbag deployment control circuit. The restraint control module checks the circuit that fires the right-hand side airbag (and on some vehicles the curtain or related initiator). It set the code because resistance or voltage in that circuit was outside the expected range. Which airbag it covers and the exact fault type vary by make and model, so check the manufacturer's data.

Symptoms

Airbag/SRS warning light on
Right side airbag may not deploy in a collision, or may deploy incorrectly
Passenger airbag status or seat occupancy indicators behaving oddly on some models
Intermittent airbag light after bumps or after the seat is moved
Failed MOT or inspection because of the SRS warning light

Possible causes

Damaged, corroded or loose connector at the right seat or right side airbag, often from seat movement or underseat wiring chafelikely
Open circuit, short to ground or short to voltage in the right side airbag wiring or clockspring-type connection (depends on airbag location)likely
Faulty right side airbag module or initiator (high or low resistance)possible
Poor repair after previous collision, trim removal or seat work, such as a connector not fully seated or a wrongly fitted partpossible
Water ingress or corrosion in the door, pillar or underseat area affecting the circuitpossible
Faulty restraint control module or internal driver faultrare

How to diagnose

Read all SRS and related modules for stored and current faults, and record any freeze frame or status data. Note any other airbag codes that point to the same circuit.
Ask about recent work: seat removal, trim or upholstery repair, a collision, or water leaks. These often explain the fault.
Following the manufacturer's SRS safety procedure (battery disconnected and left for the specified time), visually inspect the right side airbag connectors, seat wiring and harness routing for damage, pinching, corrosion and poor seating.
Check connector pins for spread terminals, corrosion and any shorting bars or locking clips that are not engaged.
After inspection, reconnect, restore power, clear the code and see whether it returns immediately or only after seat movement or a drive. Do not probe airbag circuits with a standard test lamp or meter.
Use the manufacturer's procedure to measure circuit resistance, only with approved methods and with the airbag disconnected. Check for shorts to ground or voltage in the harness.
If the wiring is good, substitute with the correct approved test load or known good component as the manufacturer specifies to separate an airbag fault from a control module fault.

How to fix

Repair or replace damaged wiring or connectors in the right side airbag circuit using the manufacturer's approved method, and do not make ad hoc splices.
Refit and fully seat any loose connector, and secure the harness so seat movement cannot strain it.
Replace the faulty airbag module or initiator with the correct part, following the manufacturer's procedure.
Dry out and repair any water ingress source, and treat or replace corroded terminals.
Replace or reprogram the restraint control module only if testing confirms it is faulty, and carry out any required coding or setup afterwards.

Can I keep driving?

High severity

The car will usually still drive, but the right side airbag may not work in a crash, so avoid unnecessary journeys and have it inspected promptly. Do not let anyone work on the airbag system without following SRS safety precautions.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.