B0039 high Severity

B0039: Second Row Right Frontal Stage 1 Deployment Control Fault

No direct engine drivability impact but the airbag/passive safety system may be disabled or unreliable, increasing passenger risk in a collision.

Overview

B0039 airbag second row right frontal stage 1 deployment control circuit fault

Common Symptoms

  • Airbag/SRS warning lamp illuminated on instrument cluster
  • Possible intermittent warning light behavior
  • Failure of the second-row right frontal airbag to deploy in a crash

Most Common Causes

Damaged or corroded airbag wiring harness or connectors high

Wiring issues between SRS control module and second-row right frontal airbag commonly cause B0039.

Faulty airbag control module or SRS control unit medium

Internal faults or corrupted calibration data in the SRS module can trigger the code.

Faulty airbag component (inflator or sensor) medium

Defective airbag hardware or sensor affecting deployment loop.

Poor or loose electrical connections medium

Loose pins or corrosion at connectors may interrupt signal path.

Aftermarket or improper installation interference low

Non‑OEM modifications affecting wiring or modules can contribute.

Diagnostic Steps

  1. Connect an advanced SRS/airbag capable scan tool and retrieve B0039 and any related codes.
    Expected: SRS warning code B0039 present; possibly additional SRS codes.
    Interpretation: Confirm the code and check for patterns indicating related circuit faults.
  2. Visually inspect wiring and connectors for the second row right frontal airbag circuit.
    Expected: Look for broken wires, corrosion, loose pins, or damaged insulation.
    Interpretation: Physical wiring issues often correlate with this code and should be addressed first.
  3. Measure continuity and resistance of the airbag deployment loop with a multimeter.
    Expected: Continuity with resistance less than manufacturer specification (often <5 ohms).
    Interpretation: High resistance or open circuit confirms wiring/connection faults.
  4. Verify stable power supply to the SRS module during key ON.
    Expected: 12V supply present with minimal drop.
    Interpretation: Low supply voltage can falsely trigger the deployment control fault.
  5. If wiring and supply checks pass, test or replace the SRS control module.
    Expected: Module responds correctly to bi‑directional tests or triggers again.
    Interpretation: Persistent faults after wiring checks point toward module replacement.

Repair Solutions

Repair or replace damaged wiring/connectors in the airbag circuit medium
Estimated Cost: $150 - $400

Cost varies based on labor and extent of wiring damage.

Replace faulty SRS/Airbag control module hard
Estimated Cost: $400 - $1000

Module must be VIN‑programmed and calibrated per OEM specifications.

Replace defective airbag sensor or inflator medium
Estimated Cost: $200 - $600

Depends on part cost and access; OEM parts preferred.

Common Misdiagnoses

Avoid these common diagnostic mistakes:

  • Assuming a generic engine or transmission fault without recognizing SRS system context

Frequently Asked Questions

Can you explain the meaning of B0039?

The B0039 code stands for Second Row Right Frontal Stage 1 Deployment Control Fault. This generally indicates an issue with the Sensors system.

Reflecting on severity: How bad is B0039?

You should treat B0039 as a high issue. No direct engine drivability impact but the airbag/passive safety system may be disabled or unreliable, increasing passenger risk in a collision.

How do I know if I have code B0039?

You may experience the following: Airbag/SRS warning lamp illuminated on instrument cluster, Possible intermittent warning light behavior, Failure of the second-row right frontal airbag to deploy in a crash.

What causes the B0039 code?

The most common causes are: Damaged or corroded airbag wiring harness or connectors, Faulty airbag control module or SRS control unit, Faulty airbag component (inflator or sensor).

How much does it cost to fix B0039?

Expect to pay around $400 if the issue is a Repair or replace damaged wiring/connectors in the airbag circuit, but up to $1000 if the Replace faulty SRS/Airbag control module needs replacement.

Does B0039 affect Ford, Toyota, or Honda?

The B0039 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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