Airbags

B0084 — Right Front Impact Sensor Circuit Fault (SRS)

Severity: medium Safe to drive

What B0084 means

The airbag (SRS) control module constantly polls its impact sensors and monitors their circuits. B0084 is stored when communication with the right front impact sensor is lost or the signal is not valid. Some references link this code to a seatbelt load limiter circuit, so confirm the exact definition for your vehicle. While the fault is active, the system may disable part of the occupant protection.

Symptoms

  • SRS or airbag warning light on or flashing
  • B0084 stored in the SRS module
  • Airbags or pretensioners on that side may be disabled
  • Light appeared after bumper, body or headlight work

Possible causes

  1. Sensor connector left unplugged or loose after bumper or radiator support work
  2. Damaged, chafed or corroded wiring in the front right harness
  3. Failed right front impact sensor
  4. Corroded or loose connector terminals
  5. Sensor or bracket damaged in a minor collision
  6. Rarely, a faulty SRS control module

How to diagnose

  1. Scan the SRS module, record the code, clear it and see if it returns
  2. Inspect the sensor and connector behind the bumper and on the radiator support for seating, locking tab and corrosion
  3. Check the harness from the sensor to the SRS module for chafing, breaks or past repairs
  4. Confirm the sensor is mounted correctly and not bent after an impact
  5. Disconnect the battery and wait the manufacturer's specified time before any electrical testing to avoid accidental deployment
  6. Measure circuit resistance and compare with the service manual
  7. View sensor data on the scan tool if the module provides it

Common fixes

  • Reconnect and lock the sensor connector, clean the terminals
  • Repair or replace the damaged harness section
  • Replace the right front impact sensor
  • Replace or reprogram the SRS module if everything else checks out

Questions and answers

What does B0084 mean?

The SRS module found a problem in the right front impact sensor circuit. It is most often a connector or wiring issue, less often the sensor itself.

Can I drive with the SRS light on?

You can drive, but the airbags may not work in a crash. Have it diagnosed as soon as you can.

Why did this appear after bumper repair?

The sensor connector was probably left unplugged or the harness was damaged. Check the connector seating and wiring condition.

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.