B0013 on 2006-2011 Cadillac DTS: Airbag Light Causes and Fixes

What's Unique About the 2006-2011 Cadillac DTS

For this generation of Cadillac DTS and a vast number of other concurrent GM vehicles, the B0013 code is very frequently caused by a known issue with a small plastic part. The yellow Connector Position Assurance (CPA) retainer on the airbag module's electrical connector becomes brittle over time and breaks. GM issued a Technical Service Bulletin (TSB #08-09-41-002H) acknowledging 🎬 Watch: How to diagnose and fix GM airbag codes B0012 and B0013. this exact problem across a wide range of its vehicles, including the DTS, making this a well-documented and highly probable point of failure.

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.
• Message on the Driver Information Center (DIC) indicating a problem with the restraint system.

Most Likely Causes

1. Broken Driver Airbag Connector Position Assurance (CPA) Retainer 🔴 High Probability → Shop Multi-Purpose Retainer As documented in GM TSB #08-09-41-002H, the plastic used for this small yellow clip becomes brittle with age and heat cycles, causing it to crack or break. This prevents it from holding the electrical connector securely, leading to high resistance or an open circuit. This is an extremely common failure across dozens of GM models from this era.
   How to confirm: After disconnecting the battery and waiting for the system to discharge, remove the driver's airbag module. Inspect the yellow or orange plastic clip on the electrical connector. If it is cracked, broken, or falls apart upon removal, this is the cause.
   Typical fix: Replace the Connector Position Assurance (CPA) retainer. The TSB specifies part number 54590003 (Orange CPA). This is a small plastic part that clips onto the connector to secure it.
   Est. part cost: $5-$20
2. Faulty Clock Spring (Steering Wheel Airbag Coil) 🟡 Medium Probability → Shop Air Bag Clockspring The clock spring is a set of coiled wires that maintains electrical contact with the steering wheel controls and airbag while the wheel turns. Constant rotation can lead to internal wire fatigue and breakage over time.
   How to confirm: If the CPA retainer is intact, the next step is to test the continuity of the clock spring circuits related to the Stage 2 airbag loop using a multimeter. This requires specific diagnostic procedures and should be done with the airbag module disconnected. Poor terminal tension at the clock spring connector can also be a cause, as noted in GM document PI1474.
   Typical fix: Replace the clock spring assembly.
   Est. part cost: $50-$150
3. Wiring or Connector Issue ⚪ Low Probability
   How to confirm: Visually inspect the wiring harness leading to the steering column and the connectors at the base of the column and at the SDM. Check for chafed wires, corrosion, or loose pins. A service manual (like PI1474 for a similar issue on other Cadillacs) may recommend checking for poor terminal tension in the connectors. The TSB also recommends applying dielectric grease to terminals when reassembling.
   Typical fix: Repair the damaged section of the wiring harness or replace the faulty connector. For poor terminal tension, replacing the connector pigtail (e.g., GM P/N 13580115 on some models) may be required.
   Est. part cost: $10-$100

Rare But Worth Checking

• Faulty Driver Airbag Module: → Shop Air Bag The airbag inflator module itself can fail internally, but this is much less common than the connector or clock spring issues. This is typically diagnosed by substitution after all other circuit possibilities have been eliminated.
• Faulty Sensing and Diagnostic Module (SDM): → Shop Air Bag Control Module The main airbag control unit can fail, but it is rare for it to cause a single deployment loop code. This is the last component to suspect after thoroughly checking all wiring, connectors, the clock spring, and the airbag module itself.

Diagnosis Steps

1. SAFETY FIRST: Disconnect the negative battery terminal and wait at least 15-30 minutes for the SRS system's backup power to fully discharge before working on any airbag components.
2. Scan the SRS module for the specific B0013 sub-code (e.g., B0013 04 for open circuit, B0013 0D for high resistance) to get more diagnostic clues.
3. Remove the driver's airbag module from the steering wheel. This typically involves inserting a blunt tool or small screwdriver into access holes on the side or back of the steering wheel to release retaining clips.
4. Carefully disconnect the electrical connector(s) from the airbag module. This often involves lifting a primary lock before pulling the connector. Inspect the yellow or orange Connector Position Assurance (CPA) retainer. If it is cracked, broken, or missing, this is the most likely cause.
5. If the CPA is intact, inspect the connector terminals for corrosion or damage. Per TSB 08-09-41-002H, check for poor terminal tension.
6. If the connector and CPA are fine, the next logical step is to test the clock spring for continuity on the Stage 2 circuit.
7. If the clock spring tests good, the fault may lie in the wiring between the clock spring and the SDM, or, rarely, the airbag module or SDM itself.
8. After any repair, reconnect all components, apply dielectric grease to the terminals, reconnect the battery, and use a capable scan tool to clear the B0013 code from the SRS module. Verify the airbag light stays off. A standard code reader may not be able to clear SRS codes.

Parts You'll Likely Need

• Airbag Connector Position Assurance (CPA) Retainer (OEM #54590003) — This is the most frequent failure point for this code on this vehicle, as documented by GM's own service bulletin.
  Trusted brands: ACDelco / GM Genuine, Dorman (may be included in connector kits)
  OEM price range: $5-$15
  Aftermarket price range: $5-$10
• Clock Spring (SIR Coil) — This is the second most common cause, as the internal wiring can break from the repeated motion of the steering wheel.
  Trusted brands: ACDelco, Standard Motor Products (SMP), Dorman
  OEM price range: $100-$180
  Aftermarket price range: $50-$150

Related Codes That Often Appear With This One

• B0012 — B0012 refers to the Stage 1 deployment loop for the same driver's airbag. Since the CPA retainer secures the entire connector, its failure can cause intermittent contact on both the Stage 1 and Stage 2 circuits, often causing both codes to appear together.

Technical Service Bulletins (TSBs) & Recalls

• 08-09-41-002H: 'Intermittent AIR BAG Indicator/Lamp Illuminated with DTC(s) B0012, B0013...Set (Inspect and Replace Connector Position Assurance (CPA) Retainer)'. This TSB is the primary document identifying the most common cause and lists the specific part number for the replacement CPA.
• PI1474: 'Air Bag Indicator Illuminated with DTC B0012 or B0013'. This document points to poor terminal tension in the clock spring connector as a possible cause for newer Cadillacs, which can be a relevant secondary diagnostic step if the CPA is intact.

Platform-Specific Known Issues

• The 2006-2011 Cadillac DTS is explicitly mentioned in GM Technical Service Bulletin #08-09-41-002H for intermittent airbag lights caused by faulty CPA retainers on various airbag connectors, including the one that triggers B0013.

Mechanic-Grade Diagnostic Values

• Driver Steering Wheel Air Bag Deployment Loop 2 Resistance — expected: 2.1–4.0 Ω. Failure: A reading greater than 4.4 Ω (sets B0013 0D) or less than 1.7 Ω (sets B0013 0E).

Hidden / Shadow Codes Worth Checking

• B0013 01: Driver Steering Wheel Air Bag Deployment Loop Stage 2 Short to Battery (see via Professional SRS-capable scan tool (e.g., GM Tech2, GDS2).)
• B0013 02: Driver Steering Wheel Air Bag Deployment Loop Stage 2 Short to Ground (see via Professional SRS-capable scan tool (e.g., GM Tech2, GDS2).)
• B0013 04: Driver Steering Wheel Air Bag Deployment Loop Stage 2 Open (see via Professional SRS-capable scan tool (e.g., GM Tech2, GDS2).)
• B0013 0D: Driver Steering Wheel Air Bag Deployment Loop Stage 2 High Resistance (> 4.4 Ω) (see via Professional SRS-capable scan tool (e.g., GM Tech2, GDS2).)
• B0013 0E: Driver Steering Wheel Air Bag Deployment Loop Stage 2 Low Resistance (< 1.7 Ω) (see via Professional SRS-capable scan tool (e.g., GM Tech2, GDS2).)

Scan Tool Commands That Help

• GM Tech2 / GDS2: Live Data > SIR > Deployment Loop Resistance — After confirming the CPA retainer is intact, this function is used to diagnose an intermittent open or high resistance in the clock spring. A technician will monitor the resistance value in real-time while turning the steering wheel from lock to lock. Any spikes, dropouts, or readings outside the 2.1-4.0 Ω range indicate a faulty clock spring.

Wiring & Ground Locations

• SDM (Sensing and Diagnostic Module) — Beneath the center console, between the front seats. It is the central computer for the airbag system and has bright yellow connectors.. This is the module that sets code B0013. While module failure is rare, checking its connectors for security and corrosion is a valid, albeit advanced, diagnostic step.
• G304 / G305 — G304 is located under the front passenger's seat; G305 is under the driver's seat.. These are primary ground points for various interior modules, including connections for the SDM. A poor ground connection here could potentially cause erratic behavior in the SRS system, though it would likely trigger multiple, less specific codes.

Real Owner Repair Stories

• YouTube channel 'Car Care Clues' (2006 Chevrolet Malibu (contemporary GM vehicle covered by the same TSB as the DTS)) — Airbag light on with code B0013.
  ❌ Tried (didn't work) The video directly diagnoses the common failure point first.
  ✅ What actually fixed it The yellow Connector Position Assurance (CPA) retainer on the driver's airbag was found to be broken. Replacing the small plastic CPA clip and clearing the code with a capable scan tool resolved the issue and turned off the airbag light.

OEM Part Supersession History

• 54590003 → 88988974 — Part number 54590003 was referenced in the original TSB as part of a terminal repair kit or available in a package of 5. Part number 88988974 is the current, individually orderable GM part number for this retainer clip.

Model Year Variations Within This Range

• 2006-2011: The clock spring (SIR coil) has different part numbers for standard models versus those with hearse or limousine chassis. Part #15231662 is listed for hearse/limousine models, while #19180232 is for standard sedans. Ensure the correct part is ordered if clock spring replacement is necessary.