2018 GMC Terrain Air Bags May Fail to Deploy in Crash
GM recalls 2018 GMC Terrain vehicles with faulty airbag system that may not deploy during crashes. Owners must have SDM reprogrammed by dealers.
Use caution until it’s fixed
If the SDM becomes inoperative, it will not detect a crash or command the necessary air bag deployment, increasing the risk of injury in the event of a crash.
What happened, in plain English
GM is recalling certain 2018 GMC Terrain vehicles because the airbag system may not deploy during crashes if the sensing diagnostic module (SDM) becomes inoperative. This could increase injury risk in collisions. Read more at govinfonow.com/recall/1224947-2018-gmc-terrain-air-bags-may-fail-to-deploy-in.
Source Summary by GovInfoNow · govinfonow.com/recall/1224947-2018-gmc-terrain-air-bags-may-fail-to-deploy-in · Updated October 7, 2026 · Official notice: NHTSA #18V340000
Cite this page
“2018 GMC Terrain Air Bags May Fail to Deploy in Crash.” GovInfoNow, updated October 7, 2026. https://govinfonow.com/recall/1224947-2018-gmc-terrain-air-bags-may-fail-to-deploy-in. Based on NHTSA recall #18V340000 (https://www.nhtsa.gov/recalls?nhtsaId=18V340000).
Why it’s dangerous
The SDM may not power down correctly when the vehicle is shut off, causing it to be inoperative when the vehicle is restarted. This means the airbag system might fail to deploy during a crash, increasing injury risk.
Who’s affected
Owners of 2018 GMC Terrain vehicles with the faulty sensing diagnostic module (SDM) are affected. Drivers and passengers in these vehicles face higher injury risk during crashes.
How to tell if you have this one
This recall affects 2018 GMC Terrain vehicles. The issue is related to the sensing diagnostic module (SDM) that may not power down correctly when the vehicle is shut off.
- Brand
GMC- Category
Vehicle
What to do — step by step
Contact GM Customer Service
Call 1-800-462-8782 to confirm your vehicle is affected and schedule a reprogramming.
Have SDM Reprogrammed
Dealers will reprogram the SDM with updated software at no cost to fix the issue.
What NHTSA says to do
GM will notify owners, and dealers will reprogram the SDM with updated software, free of charge. The recall began June 29, 2018. Owners may contact GMC customer service at 1-800-462-8782. GM's number for this recall is 18179.
How this recall unfolded
Recall timeline
2 dated steps over 36 days.
- NHTSA received the defect report
- Recall began
Dates from the agency record only; steps without a date are left out.
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Where this comes from
The facts (hazard, remedy, dates, manufacturer) are pulled from the official NHTSA recall record. The plain-language summary and step-by-step checklist are written by GovInfoNow to make the official notice easier to act on — they don’t replace it.
- Official source: NHTSA Recall #18V340000 (May 24, 2018)
- Plain-language summary written by qwen3:4b on October 7, 2026, from the official record above. Not reviewed by a person — if it conflicts with the NHTSA notice, the notice is correct. Report an error on this page.
- GovInfoNow is an independent service and is not a government agency. We republish official NHTSA recall data; we don’t issue, amend or administer recalls.