Blind Spot Detection Problems of GMC Sierra 1500

The 2019 GMC sierra at4 with the 6. 2l v8 engine began making a rattling or tapping noise at 45 mph. No warning lights appeared on the dashboard. When starting the engine and idling, a similar noise can be heard from the engine. I bought the vehicle used from a dealership one month ago, with 80,000 miles, and the second issue is the complete failure of the blind spot warning system on both mirrors. It was a one-owner vehicle with a clean carfax. I am scheduled to take the vehicle to the dealership's service department for a full inspection.

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I am reporting a safety-related defect involving the blind zone alert system. The system failed repeatedly and required multiple service visits. Initial repairs did not resolve the issue. The dealership ultimately determined the cause to be a faulty wiring harness, which has now been replaced and appears to have corrected the issue. Safety concern: failure of a critical safety system increased risk during lane changes issue persisted across multiple repair attempts additional concern: the delay in identifying the defect required multiple service visits and resulted in significant out-of-pocket costs. Request: investigation into: wiring harness defects affecting safety systems reliability of blind zone monitoring systems.

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I purchased my 2024 GMC Sierra 1500 on July 4, 2024. Shortly after purchase, the vehicle began experiencing recurring electrical and electronic malfunctions affecting multiple safety and driver-assistance systems. These issues include power mirrors not consistently folding when the vehicle is locked, the digital speed (mph) intermittently not displaying on the dashboard, driver seat memory not always setting upon entry, and blind spot warning indicators activating while driving when no vehicles or objects are present. More critically, the rear parking assist sensors do not function consistently and often fail to alert before contact with an object. I have backed into objects on multiple occasions before the sensors activated or without any warning, creating a safety risk while reversing. I first brought the vehicle to the dealership on January 13, 2025 for these issues, but they were not resolved. I purchased two GMC-branded trailer cameras in December 2024 that are advertised as compatible with this vehicle. On September 1, 2025, I returned to the dealership when the “invisible trailer” feature became inoperable. The trailer camera system frequently shows a black screen, cuts out intermittently, or fails to display an image. I returned again on September 11, 2025 due to continued failure of the invisible trailer feature and rear parking assist. The dealership kept my vehicle until December 2, 2025 (approximately one month), but the issues remain unresolved. I am scheduled to return again in January. These failures reduce rear visibility and compromise multiple safety systems. Despite repeated dealership repair attempts and extended service time, the problems persist, suggesting a defect involving the vehicle’s electrical system, sensors, software, or camera modules. I have photo and video documentation of these failures.

I have had no issues with my vehicle since I purchased it in July 2022 and keep up with the routine maintenance on it. About 2. 5 weeks ago I was driving to work like I normally do and the truck started making a knocking noise and all these sensors lights came on the dash. The alerts were saying to service the parking brake, service esc, and that steering assist is reduced and to drive with care. The vehicle also started shaking and would not accelerate properly or shift gears. We ended up taking it to the closest GMC dealership and they were in able to diagnose it just by simply hooking it up, they had to fully dismantle the engine in order to diagnose it. They came back and said cylinder number 4 is damaged as well as the lifters and cam shaft. I am no car expert but it is weird that a car that is relatively new and has the maintenance kept up on it should not experience a serious malfunction like this. What is even weirder is my sister in law has a 2020 chevy silverado where the almost identical thing just happened to theirs and it too is now in the show as well needing its engine and stuff repaired.

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The issues with my vehicle began when the radio intermittently cut off or froze. Despite several attempts by the dealer to resolve the problem, they were unsuccessful. Early on, various electrical components failed to load or perform correctly, with the dealer attributing this to software updates. Currently, when the radio cuts off or freezes, I experience additional problems: the headlights randomly flash between dim and bright, the heads-up display fails to load or shows incomplete information, the collision detection activates with no objects around, and dynamic cruise control becomes unreliable or fails to engage. The wipers operate randomly, and the vehicle stalls when the auto start/stop feature is engaged. Random warning lights appear on the dash, and each day brings new, different issues. A new symptom involves the vehicle not recognizing the keys are inside, causing it to shut off and lock me inside. This recently happened while I was driving at low speed in a parking lot, which poses a serious safety risk. On the interstate, safety issues are more concerning: headlights flashing on and off, dynamic cruise control failing, blis and collision control activating unexpectedly, and the vehicle locking me inside with keys in the truck. My children are scared to ride in the vehicle due to these issues. The dealer claims they cannot replicate the problems, despite videos I’ve provided showing malfunctions. They acknowledge the issues but blame them on software updates. Multiple updates have been applied, but the problems continue and are becoming more frequent, affecting more systems. The vehicle is under warranty, but as of December 13, 2024, the dealer has refused to service it. After the dealer completed some work, an independent inspection confirmed the issues persist. Warning messages and malfunctioning lamps have been captured on video. Problem has been reported from first service approximately 6/2023 as radio malfunction / electrical issues.

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I own a 2025 GMC Sierra 1500. The rearview camera is inoperable at night (image is too dark). Brought vehicle into to purchasing dealer with complaint. After service, I was told that there was nothing they could do to correct the issue. I then contacted GMC customer service. They advised to bring the vehicle to a different dealer and upon completion to contact customer service again. I did as advised and took the vehicle to a second dealership with the same result. As you are aware, this is a violation of federal law and a serious safety issue for small children, pets or any object behind the vehicle in the dark. Based on what I have been able to discover there are many people with this same complaint. Gm is not addressing this issue and is as unwilling to assist others as they have been to assist me.

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I face this problem.

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Front blind spot visibility is dangerous and GMC does not provide a forward facing camera standard. Blind spot warning also not standard and visibility is subpar.

Side blind zone warning in driver’s side mirror constantly alerts(turns on) when driving on a highway next to guardrails without any other vehicles nearby. Extremely disturbing at night.

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The contact owns a 2022 GMC Sierra 1500. The contact stated that upon starting the vehicle, the lane keep assist unavailable message was displayed. The dealer was notified of the failure but offered no assistance. The contact stated that the failure had caused other safety features to not operate as designed. The contact stated that the blind spot and forward collision avoidance feature failed to operate as needed. The manufacturer was not notified of the failure. The vehicle was not repaired. The failure mileage was approximately 8,000.

I took my truck to the dealership because of my issues and they said they had many trucks going in with the same issue but there was no fix to it. The issues popping noise heard on hard turns and/or going over speed bumps, creaking noise while turning wheel left and/or right, clicking noise heard on slow sharp turns. Also when you go over a bump the truck makes a spring loud noise to the point that the whole truck bounces. Shifter is also very hard when you try to change gears.

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Power loss at lower gearing speeds and also separator loss of motion when applying gas to make truck move after complete stops. Also blind spot monitoring glitch saying vehicles are beside randomly when no traffic nearby issue to safety by drivability problems and safety components effecting correct monitoring of surroundings. Check engine light also has been on more then 2 - 5 times dealer always stating due to sensors in driving components. Has been inspected numerous times for similar issues with check engine lights and drive ability issues with loading power random times unsure of where problem exactly resides. Main vehicle for transportation for infant cannot have safety or mechanical issues u resolved but GMC has not corrected this problem at this time and when taking to dealership they asking for charges for inspection of power issues.

Rear window leaks as also reported by gm when truck was manufactured (gm service bulletin 18-na-383). Water from leaking rear window gets into the electronics used for safety systems as well as rear camera and eventually disables safety systems.