B0026 on 2009-2014 Chevrolet Traverse: Airbag Light Causes and Fixes

What's Unique About the 2009-2014 Chevrolet TRAVERSE

The first-generation Chevrolet Traverse and its GM Lambda platform siblings (2007-2014 GMC Acadia, 2008-2014 Buick Enclave, 2007-2010 Saturn Outlook) are known for issues with airbag system connectors. General Motors issued a specific Technical Service Bulletin (TSB #08-09-41-002H) that directly links code B0026 to a problem with Connector Position Assurance (CPA) retainers on a massive range of GM vehicles, including the Traverse. This points to a known weakness in the wiring connectors, making a simple connector check at the C221 connector (behind the driver's kick panel) the most important first step, ahead of replacing more expensive parts like the clock spring or airbag module.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.

Symptoms You May Notice

• Airbag warning light illuminated on the dashboard
• "Service Airbag" message on the driver information center (DIC)

Most Likely Causes

1. Loose, Damaged, or Missing Connector Position Assurance (CPA) Retainer 🔴 High Probability This is a well-documented issue covered by GM TSB #08-09-41-002H. The CPA is a small plastic clip that ensures the main airbag connector is locked. If it fails, the connection becomes intermittent, causing a high-resistance fault. The C221 connector behind the driver's kick panel is the most common location for this failure.
   How to confirm: Visually inspect the yellow airbag connectors, particularly the C221 connector behind the driver's side kick panel and the connectors at the base of the steering column. Check if the CPA retainer (a small, often black or white, plastic lock on the yellow connector) is present, fully seated, and not broken.
   Typical fix: Reseat the connector and install a new CPA retainer if the original is faulty. The TSB recommends disconnecting and reconnecting the connector three times to clean the contacts before applying dielectric grease (GM P/N 12345579) to the terminals.
   Est. part cost: $5-$15
2. Faulty Clock Spring (SIR Coil) 🟡 Medium Probability The clock spring contains a flexible ribbon of wires that constantly flexes as the steering wheel turns. Over time, these wires can fatigue and break, causing an open circuit. This is a common wear item on most vehicles.
   How to confirm: After confirming connectors are good, a technician can test the clock spring's continuity with a multimeter or use a diagnostic scan tool with a 2-ohm resistor to isolate the fault to the clock spring. A common symptom of a failing clock spring is the simultaneous failure of steering wheel-mounted controls like the horn, radio, or cruise control.
   Typical fix: Replace the clock spring assembly. This requires removing the steering wheel and disabling the airbag system.
   Est. part cost: $50-$250
3. Corroded or Damaged Wiring/Terminals ⚪ Low Probability While the TSB focuses on the CPA retainer, the underlying issue can be corrosion or poor terminal tension within the connector itself. The C221 connector's location behind the driver's kick panel can expose it to moisture from wet shoes or a water leak, leading to green or white corrosion on the pins. In some cases, the wire can break off the terminal pin inside the connector housing, which is not visible without disassembly.
   How to confirm: Disconnect the connector (after disabling the SIR system) and inspect the metal terminals for green or white corrosion or signs of damage. Gently tug on the wires entering the connector to ensure they are secure.
   Typical fix: Clean the terminals carefully with a specialized electrical contact cleaner. If terminals are bent or damaged, the connector pigtail may need to be replaced. The TSB recommends applying dielectric grease upon reassembly.
   Est. part cost: $10-$60

Rare But Worth Checking

• Faulty Airbag Module (Driver's Side): This is rare. The airbag module itself is a robust component. It should only be considered after all wiring, connector, and clock spring issues have been definitively ruled out by a professional using a load tool/resistor test.
• Faulty Sensing and Diagnostic Module (SDM): An internal failure of the main airbag computer is extremely unlikely to cause a single circuit code like B0026. This would typically be accompanied by other codes or a complete loss of communication with the module (U0151).
🎬 Watch: Troubleshooting a Traverse with no airbag module communication.

Diagnosis Steps

1. SAFETY FIRST: Disconnect the vehicle's negative battery terminal and wait at least 15 minutes to allow the airbag system's backup power to discharge before touching any yellow connectors or wiring.
2. Scan the SDM for the specific B0026 symptom byte (e.g., 04 or 0D for Open/High Resistance) using a professional-grade scan tool that can read 'B' (Body) codes.
3. Locate and inspect the primary airbag harness connectors. Start with the C221 connector, a yellow 4-way connector often found behind the driver's side kick panel/hinge pillar trim.
4. Inspect the Connector Position Assurance (CPA) retainer on the C221 connector. Ensure it is not broken, loose, or missing.
5. Per TSB 05-09-41-001 (a predecessor to the current TSB), a good diagnostic step is to disconnect and reconnect the C221 connector three times to help clean the contacts. Clear the code and see if it returns. If it does not, the issue was a poor connection.
6. If the code returns, disconnect the connector again and inspect the terminals for corrosion (green crust), damage, or poor pin tension.
7. If connectors appear perfect, the next step is to test the clock spring. This is best done by a professional using a special 2.0 to 2.5-ohm diagnostic resistor to bypass components and isolate the fault.
8. If the clock spring and wiring to it are confirmed to be good, the fault may lie in the wiring between the SDM and the steering column, or, rarely, the airbag module itself.
9. After any repair, clear the DTCs and cycle the ignition to verify the airbag light stays off. A history DTC will typically clear on its own after 255 malfunction-free ignition cycles.

Parts You'll Likely Need

• Connector Position Assurance (CPA) Retainer (OEM #88988974) — As per TSB 08-09-41-002H, this small plastic clip is the most common point of failure leading to a poor connection and this code.
  Trusted brands: ACDelco, GM Genuine Parts
  OEM price range: $5-$15
  Aftermarket price range: $5-$10
• Air Bag Clock Spring (OEM #25941116) — This is the second most common cause. The internal wires break from the repeated motion of the steering wheel, causing an open circuit. A superseded or alternative part number may be 25966964.
  Trusted brands: ACDelco, Dorman
  OEM price range: $150-$250
  Aftermarket price range: $50-$150
• Airbag Connector Pigtail (OEM #15306186) — If the C221 connector or its terminals are corroded or damaged beyond cleaning, the connector itself must be replaced by splicing in a new pigtail.
  Trusted brands: ACDelco, Dorman
  OEM price range: $30-$60
  Aftermarket price range: $15-$40

Related Codes That Often Appear With This One

• B0012 — This code is for the 'Driver Frontal Deployment Loop Stage 2' and is also covered by TSB 08-09-41-002H, pointing to the same connector issues.
• B0013 — This code is for the 'Driver Frontal Deployment Loop Stage 2' and is also covered by TSB 08-09-41-002H, pointing to the same connector issues.
• B0044 — This is another code for the driver's side deployment loop (Stage 2 Open). It is very common to see B0026 and B0044 together, pointing to a fault in the main connector (C221) or the clock spring.

Technical Service Bulletins (TSBs) & Recalls

• 08-09-41-002H: Intermittent AIR BAG Indicator/Lamp Illuminated with DTC B0026 (among others) Set. Recommends inspecting and replacing the Connector Position Assurance (CPA) Retainer.
• 05-09-41-001: An earlier version of the TSB that also identified the C221 connector as the primary cause for B0026 and recommended disconnecting/reconnecting it multiple times as a diagnostic step.

Platform-Specific Known Issues

• A recall (NHTSA 14V118, GM #14030) was issued for 2009-2013 Traverse models for faulty wiring connectors for the side-impact airbags under the seats. While this recall doesn't directly address the B0026 code for the steering wheel airbag, it highlights the platform's known vulnerability to connector-related issues.

Mechanic-Grade Diagnostic Values

• Driver's Airbag Deployment Loop Resistance — expected: 1.3 - 4.8 ohms. Failure: A resistance reading greater than 4.8 ohms for 500 milliseconds will set code B0026.
• Diagnostic Resistor Substitution Tool — expected: 2.0 to 2.5 ohms. Failure: This tool (e.g., J-38815-A) is used to substitute components like the airbag or clock spring. If the code clears when the tool is plugged in, the component it replaced is faulty.

Hidden / Shadow Codes Worth Checking

• B0026 0D: This is a symptom byte indicating the specific fault is 'Open/High Resistance'. (see via A professional scan tool like the GM Tech2 or GDS2 that can read full body diagnostic trouble codes and their symptom bytes.)
• B0026 04: This is a symptom byte indicating the specific fault is 'Open/High Resistance'. It serves a similar purpose to 0D. (see via A professional scan tool like the GM Tech2 or GDS2 that can read full body diagnostic trouble codes and their symptom bytes.)

Scan Tool Commands That Help

• GDS2/Tech2: Live Data - SDM Deployment Loop Resistance — This function is used to monitor the resistance of the driver's airbag circuit in real-time. A technician will watch this data while turning the steering wheel lock-to-lock. If the resistance value jumps above the threshold (4.8 ohms) or goes to 'Open Loop' when the wheel is turned, it strongly indicates a failing clock spring.

Wiring & Ground Locations

• C221 — A yellow 4-way connector located behind the driver's side kick panel, near the door hinge pillar.. This is the main inline connector between the body harness (from the SDM) and the steering column harness (leading to the clock spring). It is the most common point of failure for high resistance and is specifically mentioned in GM service bulletins for this code.
• Driver Squib Circuit Wires — Runs from the SDM, through connector C221, up the steering column, and through the clock spring to the airbag module.. These wires, typically Dark Green and Tan (or sometimes White), carry the signal for the driver's airbag. A break or high resistance in either wire will trigger B0026.
• G301 — Behind the left (driver's side) kick panel.. This is a major body ground point located in the same area as the C221 connector. While not directly in the airbag loop, a poor ground connection here can cause a variety of unpredictable electrical issues in the driver's side of the dashboard, potentially affecting module performance.

Real Owner Repair Stories

• SilveradoSierra.com forum user (2009 GMC Sierra (GMT900 platform twin to the Traverse)) — "Service Airbag" message with code B0026.
  ❌ Tried (didn't work) Replacing the clock spring assembly.
  ✅ What actually fixed it After a new clock spring failed to fix the issue, the owner disassembled the main yellow connector at the base of the steering column. They discovered the tan wire had broken off right at the terminal pin, inside the connector housing, where it was not visible from the outside. Repairing this single wire and re-pinning the connector resolved the code permanently.

OEM Part Supersession History

• 15112676, 15274877, 15829093 → 25966964 — Part consolidation and potential design updates by the manufacturer.
  Heads up: When searching for a clock spring, using the latest part number (25966964) is recommended to get the most current revision.

Model Year Variations Within This Range

• 2013-2014: Following the 2013 model year facelift, some airbag system connectors may have changed. A recall for side airbags on this platform noted a switch from a 4-way to a 6-way connector under the seat for the 2013 model year. While this specific recall does not cover C221, it indicates a potential for connector changes across the SRS system. Technicians should verify the exact connector type before ordering a replacement pigtail for a 2013 or 2014 model.