B0013 on 2005-2010 Pontiac G6: Airbag Light Causes and Fixes

What's Unique About the 2005-2010 Pontiac G6

The Pontiac G6 and its GM Epsilon platform mates (like the Chevy Malibu and Saturn Aura) from this era are well-known for intermittent airbag light issues caused by faulty electrical connections rather than major component failure. GM released a widely-applicable Technical Service Bulletin (TSB #08-09-41-002H) that specifically identifies code B0013. 🎬 Watch: A breakdown of GM airbag codes B0012 through B0016. The TSB points to a common failure point: a small plastic clip called a Connector Position Assurance (CPA) retainer, which becomes brittle and breaks, causing a poor connection at an airbag module's yellow connector.

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 constantly illuminated on the instrument panel.
• "Service Airbag" message displayed on the Driver Information Center (DIC).
• An audible chime may sound when the vehicle is started.
• Scan tool retrieves DTC B0013, often with symptom bytes like 04 (open circuit), 0D (high resistance), or 0E (low resistance).

Most Likely Causes

1. Broken or Loose Connector Position Assurance (CPA) Retainer 🔴 High Probability As identified in TSB #08-09-41-002H, the plastic used for these small clips becomes brittle over time due to heat cycles and vibration, causing them to crack or fall off. This allows the main connector to loosen, creating high resistance or an open circuit.
   How to confirm: Visually inspect the yellow airbag connectors. Common locations are behind the steering wheel airbag, under the driver and passenger seats, and at the passenger knee bolster. Check if the small secondary locking clip (the CPA) is cracked, broken, or missing. Wiggling the connector may trigger the fault or cause the airbag light to flicker if it's intermittent.
   Typical fix: Replace the broken CPA retainer. The connector itself rarely needs replacement unless it is also damaged. Some owners report using a small zip-tie to secure the connector as a temporary or field repair, though replacing the CPA is the correct fix. 🎬 See this video for a step-by-step B0013 connector repair.
   Est. part cost: $5-$20
2. Damaged Wiring or Terminals at Airbag Connector 🟡 Medium Probability Wiring under the front seats is highly susceptible to damage from items stored under the seat or from the seat being moved back and forth repeatedly. This can stretch, pinch, or fray wires. Terminals can also lose tension or corrode, leading to high resistance.
   How to confirm: After disconnecting the battery and waiting for the system to discharge, disconnect the relevant airbag connector and inspect for corrosion, backed-out pins, or visible wire damage. A multimeter can be used to check for continuity on the harness side, but NEVER probe the airbag module itself.
   Typical fix: Repair the damaged section of wire or replace the connector pigtail (e.g., Dorman 645-500). Clean corroded terminals with a specialized electronic cleaner. Ensure terminals have good tension.
   Est. part cost: $15-$50 for a pigtail
3. Faulty Clock Spring (SIR Coil) ⚪ Low Probability The clock spring contains a coiled ribbon of wires that allows the steering wheel to turn while maintaining the electrical connection to the driver's airbag. Over millions of rotations, this ribbon can fatigue and break, causing an open circuit (B0013 04) or high resistance (B0013 0D).
   How to confirm: This is typically diagnosed after confirming the connectors and wiring are intact. A scan tool may show the resistance of the deployment loop change from normal to 'open' when turning the steering wheel from lock to lock. Another GM bulletin (PI1474) points to poor terminal tension at the clock spring connector itself.
   Typical fix: Replace the clock spring assembly. 🎬 Watch: How to replace a GM clock spring assembly.
   Est. part cost: $50-$180

Rare But Worth Checking

• Faulty Airbag Module (Inflator): It is rare for the airbag module itself to fail electrically. This should only be considered after all wiring, connector, and clock spring issues have been ruled out. A professional can test this with a special resistive load tool.
• Faulty Sensing and Diagnostic Module (SDM): The main airbag computer is a robust component located under the center console. It is very rarely the cause of a single deployment loop code and should be the last item to be diagnosed. The SDM must also be replaced or reset by a professional service after any airbag deployment.

Diagnosis Steps

1. SAFETY FIRST: Disconnect the negative battery terminal and wait at least 15-30 minutes for the system's capacitors to fully discharge before working on any airbag components.
2. Scan for Codes: Use a professional scan tool capable of reading SRS/airbag codes to confirm B0013 and any associated symptom bytes (e.g., 04, 0D, 0E), which specify open circuit, high resistance, etc. Note the specific circuit description provided by the scan tool.
3. Identify the Circuit: Based on the scan tool description, determine if the code is for the driver's side, passenger side, underseat, or knee bolster circuit.
4. Inspect the Connector: Access the airbag in question (e.g., remove the steering wheel airbag or lower passenger dash panel, or look under the front seats). Visually inspect the yellow connector and its CPA retainer for any cracks, damage, or looseness.
5. Confirm Connection: Gently wiggle the connector to see if it is loose. If the CPA is broken, it is the likely culprit. A YouTube video by user 'sarge G army' titled '2006 Pontiac g6 airbag removal EASY' shows how to access the steering wheel connectors.
6. Inspect Wiring: If the connector is secure, inspect the visible wiring harness for any signs of pinching, chafing, or damage, especially under the driver's seat.
7. Test Circuit (Professional): If no visual issues are found, a technician may use specific diagnostic resistors (like the J-38715-A SIR Load Tool) to safely test the circuit integrity back to the SDM, bypassing the airbag module itself.
8. Clear Codes: After the repair is complete, reconnect the battery and use the scan tool to clear the B0013 code. Cycle the ignition and verify the airbag light does not return. A standard code reader will not be able to clear SRS codes.

Parts You'll Likely Need

• Airbag Connector Position Assurance (CPA) Retainer (OEM #88988974) — This is the most common failure point identified in GM's service bulletin for code B0013. The brittle plastic breaks, causing a loose connection. This part number is for the yellow CPA; a green version (88988975) also exists for other connectors.
  Trusted brands: ACDelco, Dorman
  OEM price range: $10-$20
  Aftermarket price range: $5-$15
• Clock Spring (SIR Coil) (OEM #20940370) — The second most common cause if the code is for the driver's airbag. The internal ribbon cable wears out from steering wheel rotation, causing an open circuit. Part number 20940370 is a genuine GM replacement for a 2009 G6.
  Trusted brands: ACDelco, Standard Motor Products, Dorman
  OEM price range: $100-$180
  Aftermarket price range: $50-$120
• Airbag Connector Pigtail (OEM #ACDelco PT2785 / Dorman 645-500) — Needed only if the main connector body or its terminals are corroded, melted, or physically damaged beyond repair. The Dorman 645-500 is a widely available aftermarket option.
  Trusted brands: ACDelco, Dorman, Standard Motor Products
  OEM price range: $30-$50
  Aftermarket price range: $15-$35

Related Codes That Often Appear With This One

• B0012 — B0012 refers to the 'Stage 1' deployment loop for the same airbag (often the driver's). Since the connectors for both loops are integrated into one physical connector, a loose connection due to a broken CPA will almost always cause both B0012 and B0013 to appear together.

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... Set (Inspect and Replace Connector Position Assurance (CPA) Retainer)
• PI1474: Air Bag Indicator Illuminated with DTC B0012 or B0013 (Points to poor terminal tension at clock spring connector)

Platform-Specific Known Issues

• GM Technical Service Bulletin #08-09-41-002H directly addresses intermittent airbag lights with DTC B0013 on the 2005-2010 Pontiac G6, among many other models. The bulletin instructs technicians to inspect and, if necessary, replace the Connector Position Assurance (CPA) retainer on the affected airbag circuit connector.
• Owner forums for the Pontiac G6 frequently cite the yellow connectors under the driver and front passenger seats as a primary source of airbag faults due to damage from items stored under the seat or repeated seat movement.

Mechanic-Grade Diagnostic Values

• Airbag Deployment Loop Resistance — expected: 1.74 - 4.4 Ω (Ohms). Failure: A reading greater than ~4.4 Ω will set a high resistance code (0D). A reading less than ~1.7 Ω will set a low resistance code (0E). A reading of 65+ ohms indicates an open circuit (04).

Hidden / Shadow Codes Worth Checking

• B0013 01: Indicates the deployment loop control circuit is shorted to battery voltage. (see via A professional scan tool like a GM Tech 2 or GDS2 is required to read symptom bytes.)
• B0013 04: Indicates an open circuit in the deployment loop. This is commonly caused by a broken clock spring or a completely disconnected connector. (see via A professional scan tool like a GM Tech 2 or GDS2 is required to read symptom bytes.)
• B0013 0D: Indicates high resistance in the deployment loop (greater than ~4.4 Ohms). This is the most common symptom byte for this code, often caused by a loose CPA clip or corroded terminals. (see via A professional scan tool like a GM Tech 2 or GDS2 is required to read symptom bytes.)
• B0013 0E: Indicates low resistance in the deployment loop (less than ~1.7 Ohms). This can be caused by partially shorted wires. (see via A professional scan tool like a GM Tech 2 or GDS2 is required to read symptom bytes.)

Scan Tool Commands That Help

• GM Tech 2 / GDS2: Data Display > Deployment Loop Resistance Data — This function allows a technician to view the live resistance value (in Ohms) of each individual airbag deployment loop. Wiggling connectors or turning the steering wheel while monitoring these values can pinpoint the exact location of an intermittent high-resistance or open circuit without having to disconnect components.
• GM Tech 2 / GDS2: Clear DTCs (in K36 Restraints Control Module) — After a repair is completed, SRS codes must be cleared using a capable scan tool. Standard OBD-II readers cannot clear these codes. This function erases the fault from the SDM's memory and turns off the airbag light.

Wiring & Ground Locations

• K36 - Sensing and Diagnostic Module (SDM) — Located underneath the vehicle carpet, under the center console, between the front seats.. This is the central computer for the entire airbag system. All deployment loop circuits originate from and are monitored by the SDM. While rarely the cause, its connectors can be a point of failure, and it must be accessed for replacement.
• X85 Steering Wheel Air Bag Coil X3 Connector — Located at the base of the steering column, connecting the main body harness to the clock spring.. A GM service bulletin identifies poor terminal tension in this specific connector as a potential cause for B0012 and B0013, even if the clock spring itself is good. It should be inspected before replacing the clock spring.
• G201 / G203 — Ground points located under the center console.. These are primary grounds for various interior modules, including the Body Control Module (BCM) which communicates with the SDM. A poor ground here can cause a wide range of difficult-to-diagnose electronic issues.
• G301 — Ground point located behind the right rear seat back (Coupe/Sedan models).. Serves as a ground for rear body components. While less likely to cause a driver/passenger airbag code, poor grounds can introduce electrical noise into the system.

Real Owner Repair Stories

• Chevrolet Forum user (Chevy vehicle with similar GM airbag system) — Initially had code B0012-04 (open circuit), replaced the clock spring. Then received codes B0012-0E and B0013-0E (low/high resistance) that would not clear.
  ❌ Tried (didn't work) Replacing the clock spring (this fixed the initial open circuit but introduced a new resistance problem).
  ✅ What actually fixed it The 4-wire plug that connects to the clock spring was not making a good connection. The user cleaned the contacts with a needle and slightly bent the copper contacts on the connector downwards to create a tighter fit. This resolved the resistance codes and the airbag light went out.

OEM Part Supersession History

• Unknown → 88988974 — Standard part for securing airbag harness connectors across many GM models.
  Heads up: This is the yellow CPA retainer. A green version (88988975) is used for different, non-airbag connectors and is not interchangeable. Ensure the correct color is used.