2021 Hyundai Palisade: adaptive cruise control problems

Filed Apr 19, 2026 · Driver assistance, Electrical · NY

While vacationing in Myrtle Beach with my family the vehicle alarmed and then progressed to critical failure of safety functions while traveling at approximately 55mph on Friday April 3, 2026. The vehicle was brought to Myrtle Beach Hyundai where it was eventually diagnosed and repaired as an Alternator issue that I have found to be common with this specific vehicle. The issues I have experienced with this vehicle go far beyond a typical mechanical concern. Over time, the vehicle has exhibited repeated electrical system malfunctions, including: - False blind spot collision warnings when no vehicles are present - Intermittent failure of the crash avoidance system - Loss of cruise control functionality tied to system faults - A broader electrical failure event that triggered multiple warning systems simultaneously Most concerning, these failures have occurred while the vehicle was in motion, creating an unpredictable and potentially hazardous driving condition. The loss and unreliability of critical driver-assist and safety systems directly impacts driver awareness and vehicle control, which raises serious safety concerns. Despite multiple attempts to have this diagnosed through the dealership network while under warranty, no definitive root cause was identified, and the issue has persisted. This suggests the possibility of a systemic electrical defect rather than an isolated component failure. Additionally, I have found that similar complaints involving electrical system irregularities and cascading warning system failures have been reported by other owners of this model, further supporting the concern that this may represent a known or emerging defect pattern. Given these factors, I do not believe this situation should be categorized as routine. Instead, it warrants review under the lens of: - Vehicle safety risk - Potential defect trend - Failure of critical driver-assistance systems during operation This vehicle has not been inspected by the manufacturer.

Filed Apr 27, 2025 · Driver assistance, Suspension · GA

Self leveling struts continually are trash. They do not last more than 2 to 3 thousand miles of highway driving before they are no longer safe. The adaptive cruise control randomly reads as "radar blocked". And will work only intermittently.

Filed Mar 31, 2022 · Brakes · PA

On my way to work on the interstate with the cruise control set at 80mph a few weeks ago, the cruise control turned off automatically and all the warning lights came on within the dash. I pulled over, but the car seemed to be running fine otherwise. For the next few days the lights would be on or off and sometimes cruise control work and sometimes it didn't. I also noticed the parking break would engage automatically almost with every time I stop, which was also rare. I took the vehicle in for service and they were perplexed by the situation and had me leave my car for a few days. They thought they had it all fixed, but when I picked it up, within 24 hours, the lights came on again. I had noticed some break pressure issues when starting car up with this issue, but never a huge concern, until I backed out of my girlfriends driveway down a hill within 30 seconds of starting the car. With my foot on the pedal, the break disengaged for 2-3 seconds as I drifted down towards the street in reverse, and the ABS starting pumping until I was able to depress the brake and get the car to stop (probably drifted 10-15 feet). Thank goodness no one behind me. I drove the vehicle in for service immediately as they suggested if lights remained on, so they could run diagnostics. They ordered a wheel sensor, which took a few weeks to get in while I still drove the vehicle with the ABS causing me some concern over those 2-3 weeks. Just yesterday before my service to get wheel sensor changed today, I was out picking up food and driving through a flat parking lot within 30 seconds of starting the vehicle. The same issue with ABS happened that I had before and I started going through a stop sign and pedestrian walkway. Luckily no one coming and brakes kicked in again after 5 feet of having no brake control at low speed. Wheel sensor replaced today and lights off. Everything seems to be working. I'm extremely concerned about this safety issue and potential accidents, injuries, deaths!

Filed Dec 29, 2021 · Driver assistance, Electrical · AZ

This vehicle AWD system failed, the assitance systems failed, namely: Adaptive cruise, regular cruise, blind spot warning, emergency brake assist, lane keep assist, and parking collision warning.

Filed Dec 31, 2020 · Electrical, Transmission · 812 miles · IL

2021 palisade calligraphy - while driving on highway (comfor mode - cruise control) htrac error light came on. After stopping and shutting car off the error resolved for a few minutes and then came back on while driving. Noticed no power to rear wheels while driving - snowed next day- awd vehicle became only fwd. Took to dealer and error code p182111 was assessed. Also water intrusion in a connection and the actuator (motor) seems to be faulty. Car has 812 miles on it when this occurred. Know of another user on hyundai forum with same issues @ around 1000 miles. Waiting to hear what issues they are diagnosed with at dealer.

Filed Nov 23, 2020 · Driver assistance · 700 miles · FL

I was travelling at 50mph under cruise control with lane following and lane keeping. A car drove past me in the lane to my left at about 65mph. The computer quickly turned my wheels and sent me into the lane at my right. It was a turning lane and unoccupied. The angle of the car to the turning lane was steep. I regained control of the car before it could go off the highway to the left.