B004A high Severity

B004A: Third Row Right Frontal Stage 2 Deployment Control (Subfault)

Airbag warning light illuminated and safety system degraded; potential non‑deployment of third row right frontal airbag in crash scenarios

Overview

B004A airbag body code indicating fault in third row right frontal stage 2 airbag deployment control circuit or sensor

Common Symptoms

  • Airbag warning light ON
  • Possible diagnostic trouble codes related to airbag subsystem

Most Common Causes

Faulty third row right frontal airbag module or sensor medium
Open or shorted wiring harness in third row right airbag circuit medium
Poor electrical connection in airbag wiring or connectors medium

Diagnostic Steps

  1. Retrieve trouble code and freeze frame data with a professional scan tool
    Expected: Confirmation of B004A and any sub‑codes
    Interpretation: Verify the code is current and related to third row airbag system
  2. Perform visual inspection of wiring and connectors in the third row right frontal airbag circuit
    Expected: No damage, no corrosion, secure connections
    Interpretation: Damage or loose connectors suggest circuit faults
  3. Test continuity and resistance of airbag wiring harness with multimeter
    Expected: Continuity within manufacturer spec, no short to ground or power
    Interpretation: Abnormal readings indicate wiring fault
  4. Inspect airbag control module and sensor signals with diagnostic tool
    Expected: Proper communication and nominal sensor values
    Interpretation: Faulty module or sensor may require replacement

Repair Solutions

Repair or replace damaged airbag wiring harness/connectors medium
Estimated Cost: $100 - $350

Cost varies by accessibility of wiring and labor

Replace faulty airbag sensor or module for third row right frontal stage 2 hard
Estimated Cost: $300 - $900

Requires professional calibration and safety precautions

Common Misdiagnoses

Avoid these common diagnostic mistakes:

  • Assuming generic OBD‑II powertrain error rather than body/airbag subsystem fault

Frequently Asked Questions

Technical definition of B004A OBD-II Code

Third Row Right Frontal Stage 2 Deployment Control (Subfault) is the standard definition for B004A. This diagnostic code is triggered when the ECU detects a problem in the Sensors.

Can B004A cause engine damage?

With a severity level of high, airbag warning light illuminated and safety system degraded; potential non‑deployment of third row right frontal airbag in crash scenarios

Symptoms associated with DTC B004A

You may experience the following: Airbag warning light ON, Possible diagnostic trouble codes related to airbag subsystem.

What parts fail when B004A is set?

This code is frequently triggered by: Faulty third row right frontal airbag module or sensor, Open or shorted wiring harness in third row right airbag circuit, Poor electrical connection in airbag wiring or connectors.

What is the price difference for fixing B004A?

Repair costs depend on the specific failure. A simple Repair or replace damaged airbag wiring harness/connectors replacement is relatively affordable ($100-$350), whereas a Replace faulty airbag sensor or module for third row right frontal stage 2 repair is more expensive, potentially reaching $900.

Is B004A a generic or manufacturer-specific code?

Yes, B004A is a generic code that applies to all OBD-II compliant vehicles, including Ford, Toyota, Honda, Chevrolet, Nissan, Dodge, BMW, and more.

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