Owners of 2021 GMC Yukon models report two separate airbag system failures. First, complete non-deployment in crashes: a vehicle struck multiple times at interstate speeds saw no airbag activation despite occupant injury (chest and neck impact); another hit a curb and embankment hard enough to deploy side airbags but not front ones, sending four occupants to the hospital; a third was rear-ended at 45–55 mph with such force that the striking vehicle's front ended up in the third row, yet airbags never fired. In the most severe case, airbag non-deployment during a multi-vehicle collision also prevented OnStar emergency detection from alerting authorities because the system's accident recognition relies on airbag deployment signal.
Second, owners report an intermittent Service Safety Restraint System warning light that cycles on and off unpredictably. When this light is on, all airbags are disabled per GM protocol. Dealerships have replaced overhead consoles, seat harness connections (some vehicles multiple times), and steering wheel clock springs without permanently resolving the issue. One owner's warning reappeared immediately after completing a recall. Owners state GM issued multiple Service Bulletins addressing software, wiring, and airbag modules, but the root cause remains unclear to service departments and uncertain to owners.
Failure modes owners describe
Airbag non-deployment in collision
Front and/or side airbags failed to deploy during impacts sufficient to cause vehicle damage, injury, and hospitalization. Multiple complaints describe crashes with significant force where airbags should have activated but did not.
When: At impact during crashes; mileage ranged approximately 7,000–16,000 miles
Symptoms owners cite: Airbags did not deploy during rear-end collision at interstate speeds; Front driver and passenger airbags failed to deploy in multi-vehicle crash; Side airbags deployed but front airbags did not in curb/embankment crash; Airbags failed to deploy in rear-end collision at stop light at 45–55 mph; No warning lights preceded failure
Repairs/costs cited: Vehicles towed; most not diagnosed or repaired by manufacturer. One case: independent mechanic towed vehicle; no repair performed.
Recalls/TSBs owners mention: Manufacturer notified in at least one case but no assistance provided.
Intermittent Service Safety Restraint System warning light
SRS warning light and 'Service Safety Restraint System' message appear intermittently, cycling on and off unpredictably. When lit, all airbags are disabled per GM protocol. Owners report the warning persists or recurs after dealer repairs, creating uncertainty about airbag function.
When: Occurring shortly after purchase or months into ownership; one case documented from 9/19/2020, another 3 weeks after purchase
Symptoms owners cite: Service Safety Restraint System warning appears intermittently; Airbag warning light comes on and off; Warning appears while vehicle in motion or stationary; Light recurs after multiple dealer visits and repairs; Warning persists after recall completion
Codes mentioned: Service SRS warning
Repairs/costs cited: Dealerships replaced overhead console, seat harness connections (multiple times). Root cause often unclear without removing seat and airbag module. Repair costs not specified by owners.
Recalls/TSBs owners mention: GM issued/revised Service Bulletins addressing software, overhead wiring, clock spring in steering wheel, and driver-side airbag module. Recall completed in at least one case, but warning light reappeared afterward. GM statement: when SRS warning appears, airbags are disabled and vehicle driven at owner's own risk.
OnStar safety feature failure to detect accident
OnStar emergency contact and accident-detection system failed to alert emergency services or contact owner during a multi-vehicle collision. System only detected antilock braking system fault after wrecker arrived, not the impact itself.
When: 10/6/2021, during multi-vehicle interstate collision
Symptoms owners cite: OnStar did not detect multi-vehicle collision impact; No emergency contact or notification sent to owner during accident; Only antilock braking system diagnostic notification received post-incident via email; OnStar representative attributed non-activation to airbag non-deployment
Recalls/TSBs owners mention: OnStar call taker advised accident detection requires airbag deployment to trigger notification.
Synthesized from 12 NHTSA owner complaints — unverified consumer
allegations, summarized for patterns. The verbatim filings appear below.