Airbags

B0028 — Right Airbag Deployment Loop Resistance Low

Severity: medium Safe to drive

What B0028 means

The SRS control module constantly measures the resistance of the right airbag's deployment circuit (the squib). B0028 means the reading is below the allowed range, which usually points to a short between wires or to ground. The module treats the circuit as faulty and turns on the SRS warning light.

Symptoms

  • SRS/airbag light is on or flashing
  • Passenger airbag may be disabled or may not deploy
  • Passenger airbag off indicator may appear
  • Engine and transmission work normally

Possible causes

  1. Short or damaged insulation in the right airbag circuit wiring
  2. Corroded or damaged connector pins, such as under the seat or in the dash
  3. Faulty airbag initiator or side impact sensor
  4. Pinched harness or clock spring/contact damage after interior work
  5. SRS module fault (rare)

How to diagnose

  1. Scan SRS codes, note any others, and clear B0028 to see if it returns
  2. Ask whether seats, dash, door, or collision repairs were done recently
  3. Disconnect the battery and wait as the manufacturer specifies to avoid accidental deployment
  4. Inspect right-side harness and connectors for chafing, pinching, moisture, and corrosion
  5. Check circuit resistance and shorts to ground per the factory wiring diagram, never applying voltage to a squib
  6. Substitute a known-good component or simulator to separate a wiring fault from a component fault
  7. Test the SRS module only if the circuit proves good

Common fixes

  • Repair or replace the damaged harness section or connector
  • Replace the right airbag module or impact sensor
  • Replace or update the SRS module if confirmed faulty
  • Clear codes after repair and confirm the SRS light goes out

Questions and answers

Can I drive with code B0028?

Yes, the car will drive normally. The right airbag may not work in a crash though, so get it checked soon.

Can I just clear B0028 myself?

A scan tool can clear it, but it will return if the fault remains. SRS work is hazardous, so a qualified technician should handle it.

What does low loop resistance mean?

It means there is a short somewhere: wires touching each other or ground, or a faulty initiator.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.