B0026 on 2005-2010 Pontiac G6: Airbag Light Causes and Fixes

What's Unique About the 2005-2010 Pontiac G6

For this generation of Pontiac G6 and many other GM vehicles from the era, the B0026 code is strongly associated with a specific, well-documented issue with connector integrity rather than a failed airbag or clock spring. General Motors released a detailed Technical Service Bulletin (TSB #08-09-41-002H) that directly addresses this code, pointing technicians to inspect small plastic Connector Position Assurance (CPA) retainers on airbag system connectors before replacing any expensive components. This makes a simple, inexpensive connector inspection of connector C221 (behind the driver's kick panel) the most critical first step in diagnosis.

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 is continuously illuminated on the instrument panel.
• "Service Airbag" message displayed on the Driver Information Center (DIC).

Most Likely Causes

1. Loose, Damaged, or Missing Connector Position Assurance (CPA) Retainer 🔴 High Probability This is a widespread, documented issue on many GM platforms of this era, as detailed in TSB #08-09-41-002H. The small plastic retainers on the yellow airbag connectors can become brittle and fail, causing a poor connection and high resistance.
   How to confirm: Visually inspect the yellow airbag system connector C221, which is located behind the driver's side kick panel near the door hinge pillar. Check for loose, cracked, or missing plastic locking clips (CPAs) and ensure the connector is fully seated.
   Typical fix: Secure the connector and replace the small CPA retainer clip. In some cases, technicians recommend disconnecting and reconnecting the connector three times to clean the terminals before replacing any parts. If terminals are corroded, they may need cleaning with a specialized electronic cleaner or replacement of the connector pigtail.
   Est. part cost: $5-$15 for a CPA retainer, $15-$40 for a connector pigtail.
2. Failing Clock Spring (SIR Coil) 🟡 Medium Probability The clock spring is a wear item; the internal ribbon cable can fracture from the repeated motion of the steering wheel turning, creating an open circuit. This can sometimes manifest as the airbag light coming on only when turning the wheel.
   How to confirm: A professional technician can test the continuity of the clock spring circuits with a multimeter after disconnecting it from the airbag and SDM harness. A failure is confirmed if continuity is lost (infinite resistance) when wiggling the wires or turning the assembly. A DIY repair of the ribbon cable itself is complex and not recommended.
   Typical fix: Replace the clock spring assembly in the steering column. 🎬 See this step-by-step clock spring replacement walkthrough
   Est. part cost: $50-$250
3. Corroded or Damaged Wiring/Terminals ⚪ Low Probability Water intrusion in the driver's footwell, sometimes from a clogged sunroof drain or leaking windshield seal, can lead to corrosion in connectors like C221, located near the kick panel.
   How to confirm: Disconnect the connector (after disabling the SIR system) and inspect the metal pins for green or white corrosion or physical damage. A technician in one documented case found green corrosion on the terminals of connector C221.
   Typical fix: Clean the terminals using a specialized electronic cleaner and a small file or brush. Apply a terminal protectant like Stabilant 22A. If corrosion is severe, replace the connector pigtail.
   Est. part cost: $15-$40

Rare But Worth Checking

• Faulty Driver's Airbag Module: This is rarely the cause. It should only be considered after all wiring, connector, and clock spring issues have been definitively ruled out by a professional using a diagnostic resistor (typically 2.2-2.5 ohm) to test the circuit.
• Faulty Sensing and Diagnostic Module (SDM): The SDM is the computer for the airbag system, often located under the center console or passenger seat. It is very uncommon for it to fail, but it is a possibility if all other components and wiring in the circuit test good.

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 performing any physical inspection or repair.
2. Scan the Sensing and Diagnostic Module (SDM) with a professional scan tool capable of reading 'B' (Body) codes to confirm B0026 is the active or history code.
3. Locate and inspect the primary airbag harness connector C221. On the G6 and similar platforms, this is a yellow 4-way connector located behind the driver's side kick panel, near the door hinge.
4. Check if the yellow connector is fully seated and if the Connector Position Assurance (CPA) clip is present, intact, and locked in place. Per a GM TSB, a common fix is to disconnect and reconnect C221 three times to help clean the contacts.
5. If the CPA is faulty or the connection is loose, secure the connector and replace the CPA. Clear the codes and see if the fault returns.
6. If the connection appears good, disconnect C221 (with the battery disconnected) and inspect the male and female terminals for any signs of corrosion (green/white powder) or damage.
7. If the connector and wiring are confirmed to be good, the next step is to test the clock spring. This is a complex procedure best left to a professional, as it involves disconnecting the airbag and using a specific resistor (e.g., 2.2 ohm) to substitute components and isolate the fault.
8. If all wiring and components test good, the fault may lie with the airbag module or the SDM, which requires further advanced diagnostics.

Parts You'll Likely Need

• Connector Position Assurance (CPA) Retainer (OEM #88988974) — This small plastic clip is the most common failure point according to GM TSB #08-09-41-002H. Its failure causes a poor connection at the airbag module, leading to high resistance.
  Trusted brands: ACDelco, GM Genuine Parts
  OEM price range: $5-$15
  Aftermarket price range: $5-$10
• Clock Spring (SIR Coil) (OEM #20940370 (replaces 15925947, 15278147), 15908975, 26090508) — This is the second most likely cause. The internal wiring breaks from the stress of the steering wheel turning, causing an open circuit in the driver's airbag deployment loop.
  Trusted brands: ACDelco, Dorman, Standard Motor Products
  OEM price range: $130-$250
  Aftermarket price range: $50-$215
• Airbag Connector Pigtail (OEM #15306186) — If the connector housing or terminals are corroded or damaged, the connector itself will need to be replaced by splicing in a new pigtail. This part number corresponds to the yellow 4-way connector C221.
  Trusted brands: ACDelco, Dorman
  OEM price range: $30-$60
  Aftermarket price range: $15-$40

Related Codes That Often Appear With This One

• B0044 — This code relates to the second stage of a dual-stage driver's airbag. If a connector or clock spring issue affects the entire deployment loop, both codes can appear together. TSBs often group B0026 and B0044 as having the same root cause at connector C221.

Technical Service Bulletins (TSBs) & Recalls

• 08-09-41-002H: Diagnostic Information for Supplemental Inflatable Restraint (SIR) System, Intermittent AIR BAG Indicator/Lamp Illuminated with DTC(s) B0012, B0013, B0015, B0016, B0019, B0020, B0022, B0023, B0026, B0033, B0040, B0042 or B0044 Set (Inspect and Replace Connector Position Assurance (CPA) Retainer).

Platform-Specific Known Issues

• The 2005-2010 Pontiac G6 is explicitly listed in GM Technical Service Bulletin #08-09-41-002H, which details intermittent airbag lights caused by faulty Connector Position Assurance (CPA) retainers on SIR system connectors. This TSB covers a very wide range of GM vehicles from the era, indicating a systemic parts issue.

Mechanic-Grade Diagnostic Values

• Driver's Airbag Deployment Loop Resistance — expected: 1.5 to 3.5 ohms. Failure: Resistance is greater than 4.8 ohms for 500 milliseconds.
• Diagnostic Resistor Substitution — expected: 2.0 to 2.5 ohms. Failure: A special tool or resistor of this value is used to substitute components like the airbag or clock spring. If the code clears with the resistor in place, the component being bypassed is faulty.
• Clock Spring Winding Continuity — expected: Near 0 ohms. Failure: Infinite resistance (open circuit) or a reading that fluctuates while turning the steering wheel indicates a broken internal ribbon cable.

Hidden / Shadow Codes Worth Checking

• B0026 Fault Condition 1: The SDM detects the steering wheel module deployment loop resistance is greater than 4.8 ohms for 500 milliseconds. (see via This is the primary condition for setting the code, visible with any professional scan tool that can read GM 'B' codes.)
• B0026 Fault Condition 2: The SDM detects that the voltage at the steering wheel module high control is less than 2.4 volts AND the deployment loop resistance is 6 ohms or greater for 500 milliseconds. (see via This is an alternative condition for setting the code, representing a combination of high resistance and low voltage in the circuit.)

Scan Tool Commands That Help

• Tech2 / GDS2 or equivalent professional scanner: View SIR Data List — Used to monitor live data from the SDM, such as system voltage, before starting physical repairs. The SDM may disable deployment loops if system voltage is outside the 9-16 volt range.
• Tech2 / GDS2 or equivalent professional scanner: Clear DTCs — This function is critical after performing a repair or a diagnostic step (like using a test resistor) to see if the fault returns. A history DTC will clear on its own after 255 malfunction-free ignition cycles.
• Tech2 / GDS2 or equivalent professional scanner: Instrument Panel Cluster > Display Test — To verify that the AIR BAG indicator light in the instrument cluster is functional. This helps rule out a burned-out bulb as a contributing issue.

Wiring & Ground Locations

• SDM (Sensing and Diagnostic Module) — Located underneath the vehicle carpet, under the center console.. This is the control module that sets code B0026. While rarely the cause, its location is important for advanced diagnostics and checking its connections and ground.
• C221 — A yellow 4-way connector located behind the driver's side kick panel, near the door hinge pillar.. This is the most common point of failure for B0026 on this platform, as identified in GM TSBs. High resistance frequently develops at this connector.
• G302 / G305 — G302 is a body ground located in the rear of the vehicle. G305 is a body ground located behind the right front kick panel.. These are major grounds for various body modules. While not directly for the driver airbag circuit, a poor body ground can cause unpredictable behavior in the BCM or SDM, which communicate with each other.
• G105 — A primary powertrain ground located on a transmission stud, under the upper coolant hose on the left side of the engine compartment.. A poor G105 ground is known to cause a wide range of seemingly unrelated electrical issues and no-start conditions on the G6 and similar platforms. While not a direct cause for B0026, checking major grounds is a good practice during any electrical diagnosis.

Real Owner Repair Stories

• YouTube video on a 2006 Chevrolet Silverado (2006 Chevrolet Silverado (similar GM platform and TSB)) — Service Air Bag message on the dash with code B0026.
  ❌ Tried (didn't work) Wiggling steering wheel and tilting column did not consistently trigger the code.
  ✅ What actually fixed it The technician inspected connector C221 behind the left kick panel and found green corrosion on one of the terminals. Cleaning the terminals with a diamond file and applying Stabilant 22A terminal protectant resolved the issue and the code cleared.
• CorvetteForum user (2003 Chevrolet Corvette C5 (similar GM SIR system logic)) — Airbag light on with code B0026. The light would turn off when the steering wheel was turned all the way to the right, and come back on when straightened.
  ❌ Tried (didn't work) Initial inspection of connectors.
  ✅ What actually fixed it The symptom of the light changing state while turning the wheel pointed directly to a break in the clock spring's internal ribbon cable. Replacing the clock spring assembly fixed the problem.
• YouTube video on a 2001 Buick Century (2001 Buick Century (similar GM SIR system logic)) — Airbag light on with code B0026.
  ✅ What actually fixed it The technician used a multimeter to test for continuity through the clock spring and found an open circuit on both wires. Replacing the clock spring (steering wheel coil) fixed the issue and the airbag light went out.

"I Checked Everything" — The Actual Cause

• On a similar GM platform (2009 GMC Sierra), a technician replaced the clock spring for a B0026 code, but the fault remained. The actual cause was a broken wire inside the main yellow connector at the base of the steering column. The wire had broken off the terminal pin, but was held in place by the insulation, making it pass a visual inspection and sometimes even a continuity test if the wire made intermittent contact. The issue was only found after disassembling the connector itself.

OEM Part Supersession History

• 15278147, 15925947 → 20940370 — Part has been updated by the manufacturer over time. The newest part number reflects the latest revision.
  Heads up: The listed part numbers are generally interchangeable for the specified vehicles, with the latest number being the recommended replacement.