B0058 medium Severity

B0058: Right Third‑Row Seat Belt Sensor Circuit Fault (Open/Inactive)

No direct impact on engine performance or drivability, but may disable passenger restraint systems

Overview

B0058 is a body/SRS diagnostic trouble code indicating an open circuit or malfunction in the right third‑row seat belt sensor or pretensioner loop.

Common Symptoms

  • Airbag or SRS warning light illuminated
  • Seat belt warning indicator remains on for third‑row right passenger
  • Continuous chime or warning message related to seat belt
  • Possible ‘Service Airbag’ message on display

Most Common Causes

Open or broken wiring in third‑row right seat belt sensor circuit high

Continuity loss often triggers the open loop detection.

Corroded or poor connector contacts medium

Moisture or age can degrade electrical connections.

Faulty third‑row right seat belt sensor or pretensioner medium

Internal sensor failure can register as circuit open.

Faulty Supplemental Restraint System (SRS) control module low

Rare, typically diagnosed after wiring and sensor checks.

Diagnostic Steps

  1. Connect professional scan tool and verify B0058 presence
    Expected: B0058 appears with no other conflicting codes
    Interpretation: Confirms the code before physical checks
  2. Visually inspect wiring harness and connectors for the third‑row right seat belt sensor
    Expected: No broken wires, frayed insulation, or corrosion
    Interpretation: Damage here likely cause; repair accordingly
  3. Perform continuity check from sensor connector to SRS module
    Expected: Closed circuit within specification
    Interpretation: Open circuit indicates wiring or sensor fault
  4. Inspect and clean connectors; test sensor output voltage
    Expected: Connector pins clean; correct reference voltage present when belt buckled
    Interpretation: Improves connectivity; absence suggests sensor or wiring issue
  5. If all wiring and connectors are good, evaluate SRS control module communication
    Expected: Live data from sensor present
    Interpretation: Lack of data suggests module fault

Repair Solutions

Repair or replace damaged wiring/connectors to the third‑row right seat belt sensor medium
Estimated Cost: $50 - $200

Typical first repair step; cost varies with labor and vehicle access complexity

Replace third‑row right seat belt sensor or pretensioner assembly medium
Estimated Cost: $80 - $300

If sensor internally failed, replacement resolves open circuit

Reprogram or replace SRS control module hard
Estimated Cost: $500 - $1200

Required only if module communication error confirmed

Common Misdiagnoses

Avoid these common diagnostic mistakes:

  • Interpreting B0058 as an engine or powertrain error instead of body/SRS sensor circuit
  • Replacing entire airbag module before checking wiring and connectors

Frequently Asked Questions

What does the B0058 code mean?

The B0058 code stands for Right Third‑Row Seat Belt Sensor Circuit Fault (Open/Inactive). This generally indicates an issue with the Sensors system.

Reflecting on severity: How bad is B0058?

With a severity level of medium, no direct impact on engine performance or drivability, but may disable passenger restraint systems

Common signs of the B0058 error code

The most typical signs are: Airbag or SRS warning light illuminated, Seat belt warning indicator remains on for third‑row right passenger, Continuous chime or warning message related to seat belt.

Why is my car throwing a B0058 code?

Potential culprits include: Open or broken wiring in third‑row right seat belt sensor circuit, Corroded or poor connector contacts, Faulty third‑row right seat belt sensor or pretensioner. A proper diagnosis is recommended.

What is the price difference for fixing B0058?

The cost varies significantly based on the root cause. For example, replacing a Repair or replace damaged wiring/connectors to the third‑row right seat belt sensor typically costs between $50 and $200, while fixing a Reprogram or replace SRS control module can range from $500 to $1200.

What cars are affected by the B0058 code?

The B0058 code is a generic powertrain code, meaning it applies to almost all makes and models, such as Honda, Toyota, VW, Ford, and Chevy.

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