B0016 high Severity

B0016: Left Roof Rail / Airbag Deployment Loop Circuit Fault (Airbag System)

No direct engine drivability impact, but indicates a fault in the Supplemental Restraint System (airbag), compromising occupant safety.

Overview

B0016 DTC airbag left roof rail deployment loop circuit fault SRS airbag high/low resistance open short

Common Symptoms

  • Airbag/AIR BAG warning light illuminated on the dashboard

Most Common Causes

Open or shorted wiring harness in left roof rail deployment circuit high

Short to battery, short to ground, open circuit or abnormal resistance in airbag loop wiring can trigger B0016 in GM vehicles.

Faulty left roof rail airbag module medium

Module internal fault can cause improper circuit resistance being detected.

Poor electrical connection / corroded connector medium

Loose, corroded or bent pins at connectors in the airbag loop circuit may cause resistance or open circuit.

Faulty Supplemental Restraint Module (SDM / Airbag Control Unit) low

Less common cause but possible if module misreads loop parameters after wiring and module checks.

Diagnostic Steps

  1. Disconnect battery negative and allow system to discharge (per manufacturer safety procedure).
    Expected: System is safe to work on airbag circuit.
    Interpretation: Battery must be disconnected to avoid accidental airbag deployment during diagnosis.
  2. Perform OBD-II scan with airbag capable scanner and read B0016 subcodes.
    Expected: Retrieve subcode indicating short to battery, short to ground, open circuit, or resistance out of range.
    Interpretation: Subcodes help narrow down exact electrical fault type in the airbag loop.
  3. Visually inspect wiring harness and connectors on left roof rail airbag and SDM.
    Expected: Look for damage, corrosion, loose connections, chafing or broken insulation.
    Interpretation: Physical defects often cause loop faults; repair if found.
  4. Measure circuit resistance with a multimeter against manufacturer specified values.
    Expected: Expected resistance within tolerance.
    Interpretation: Abnormal resistance confirms wiring or component defect.
  5. If wiring checks good, replace left roof rail airbag module and retest.
    Expected: Code should clear if module was cause.
    Interpretation: Module defects can present as loop faults.

Repair Solutions

Repair or replace damaged wiring harness and connectors in left roof rail airbag circuit medium
Estimated Cost: $150 - $500

Cost varies with extent of wiring repair and labor.

Replace left roof rail airbag module hard
Estimated Cost: $300 - $1200

Airbag modules are expensive and must be installed by qualified technician.

Replace or reprogram Supplemental Restraint Module (SDM) hard
Estimated Cost: $500 - $1500

SDM replacement often requires reprogramming to vehicle VIN.

Common Misdiagnoses

Avoid these common diagnostic mistakes:

  • Assuming generic ECM/engine sensors fault without checking SRS system

Frequently Asked Questions

Can you explain the meaning of B0016?

When your OBD-II scanner reads B0016, it means: Left Roof Rail / Airbag Deployment Loop Circuit Fault (Airbag System). This code is related to the vehicle's Sensors.

Should I stop driving if I have B0016?

The B0016 code is considered high severity. No direct engine drivability impact, but indicates a fault in the Supplemental Restraint System (airbag), compromising occupant safety.

What are the symptoms of B0016?

The most typical signs are: Airbag/AIR BAG warning light illuminated on the dashboard.

Common triggers for the B0016 error

It can be caused by several factors, most notably: Open or shorted wiring harness in left roof rail deployment circuit, Faulty left roof rail airbag module, Poor electrical connection / corroded connector.

How much does it cost to fix B0016?

Expect to pay around $500 if the issue is a Repair or replace damaged wiring harness and connectors in left roof rail airbag circuit, but up to $1500 if the Replace or reprogram Supplemental Restraint Module (SDM) needs replacement.

What cars are affected by the B0016 code?

Yes, B0016 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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