Airbags

B0055 — Second Row Right Seatbelt Sensor Circuit Fault

Severity: medium Safe to drive

What B0055 means

The SRS control module continuously monitors the buckle sensor for the rear right seat. It uses this signal to decide how the restraints should deploy and what the belt status display should show. B0055 sets when that signal is missing, erratic or out of range.

Symptoms

  • SRS/airbag warning light is on
  • Seatbelt indicator for the rear right seat shows the wrong status
  • Belt reminder chime sounds falsely or not at all
  • Belt indicator flashes regardless of whether the seat is occupied or buckled

Possible causes

  1. Failed rear right seatbelt buckle sensor
  2. Open or shorted wiring in the sensor circuit
  3. Corroded or loose connector, or a damaged harness under the seat
  4. Wiring damage from cleaning, seat movement or a liquid spill
  5. Communication fault with the BCM or SRS module (less common)

How to diagnose

  1. Scan all modules with an SRS-capable tool, record the data and confirm B0055 returns after clearing
  2. Inspect the buckle and harness under the rear right seat for damage, moisture or pinching
  3. Check the sensor connector for secure latching, corrosion and bent terminals
  4. Watch the belt status in scan tool data while buckling and unbuckling
  5. Measure sensor resistance and circuit continuity to the SRS module using the factory wiring diagram
  6. Check the buckle for debris or foreign objects
  7. If sensor and wiring are good, test power, ground and communication at the SRS/BCM module

Common fixes

  • Clean and secure the connector, replace damaged terminals
  • Repair or replace the damaged section of wiring
  • Replace the rear right seatbelt buckle with its sensor
  • Reflash or replace the SRS/BCM module if a fault is confirmed

Questions and answers

What does code B0055 mean?

The SRS module detected a fault in the rear right seatbelt sensor circuit. The buckle sensor, its connector or the wiring under the seat is the most common culprit.

Can I drive with B0055?

Yes, the car will drive normally. But the restraint system for that seat may not work properly, so get it fixed soon.

Can I just clear the code?

Clearing it only turns the light off temporarily. If the cause is not fixed the code will return, so check the connector and wiring first.

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.