There are 1 stored owner reports matching the driver assist & adas leading-label group for the 2014 GMC Terrain in our NHTSA-sourced dataset. These are unverified consumer reports and may not reflect confirmed defects.
This group counts stored reports whose component label starts with one of this site's matching prefixes, ignoring case. Each matching report counts once within the group. Components mentioned later in the label or only in the narrative are not searched. How component counts work
Loaded 1 of 1 matching reports.
Open the full vehicle complaint log (all categories)"SERVICE SIDE DETECTION SYSTEM" WARNING UPON STARTUP AND SPORADICALLY WHEN DRIVING AT NORMAL SPEEDS. THE BLIND SPOT MONITOR LIGHTS IN THE SIDE MIRRORS DO NOT FUNCTION ANYMORE. UPON STARTING THE VEHICLE, BOTH SIDES USED TO ILLUMINATE WHILE RUNNING THRU SYSTEMS CHECK. NOW ONLY THE DRIVER'S SIDE LIGHTS UP. TO CONFIRM, THE BLIND SPOT MONITORING DOES NOT WORK FOR EITHER SIDE OF THE VEHICLE NOW. THE SENSOR IS UNDERNEATH THE REAR BUMPER COVER, EXPOSED TO THE ELEMENTS. THERE ARE SEVERAL FORUMS MENTIONING THIS ON THE GMC TERRAIN DENALI MODEL ALONG WITH CADILLAC AND CHEVROLET MODELS THAT HAVE THE SENSOR IN THE SAME PHYSICAL LOCATION OF THE CAR. THE SENSOR IS EXPOSED TO RAIN, SNOW, DIRT, DUST, MUD. I HAVE CHECKED RECALLS ON THIS BUT IT DOESN'T APPEAR TO HAVE ANY OUT THERE DESPITE FORUM COMPLAINTS. THERE SEEMS TO HAVE BEEN "SERVICE BULLETINS" SENT OUT FOR CADILLAC AND CHEVROLET MODELS DUE TO CUSTOMERS COMPLAINING ABOUT THIS SAME ISSUE. THOSE HAVE BEEN REPLACED AT NO COST TO THE CONSUMER FROM WHAT I UNDERSTAND. AFTER DOING SOME RESEARCH, TYPICAL COST FOR THIS PIECE DIRECT FROM ONLINE SELLERS IS $250+. TO HAVE THE DEALER REPLACE, IT'S LOOKING AT A COST UPWARDS OF $750+. THE NUMBER OF TERRAIN DENALI (THE ONLY TERRAIN TRIM WITH THE SIDE BLIND ZONE ALERT) ARE RELATIVELY LOW COMPARED WITH THE QUANTITY OF THE CADILLAC AND CHEVROLET MODELS WITH THIS ISSUE. I'M WONDERING IF THIS IS POSSIBLY WHY THERE WERE NO "SERVICE BULLETINS" ON THE TERRAIN. THE TERRAIN HAS A HORRIBLE BLIND SPOT AND I UTILIZED THIS FEATURE ALL THE TIME WHEN IT WAS WORKING PROPERLY. I FEEL LIKE SAFETY IS COMPROMISED FOR MYSELF AND MY FAMILY WITH THIS NOW NOT WORKING. I APPRECIATE ANY AND ALL ASSISTANCE.
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
NHTSA source checks for this vehicle year
Checks are recorded separately for each dataset, not for the whole page. Dates use UTC. A missing check date does not mean no records exist.
Vehicle import recorded: Apr 28, 2026. This is the stored import date, not confirmation that every source was successfully refreshed.