general problems of the 2020 Acura MDX

I was at a red light with the idle stop automatically triggered. When the light turned green, and I pressed the accelerate pedal, the car would not move. I looked and saw the car had shifted itself to n (neutral) when it should have stayed at d (drive). I pressed the "d" button to drive but it stayed in n. There was a green light around the n button indicating the selected button. I had to turn off the car, turn on the car two times before the car recognized I wanted to press the "d" button. The screen by the steering wheel had some sort of message but I don't recall what it said. The word "accessory" might have been part of the message. This is absolutely a safety risk for myself and others. I had cars behind me at the green light honking. I had to turn on the hazard lights and wave to them out the window. If the driver before me did not pay attention, they could have hit me. This is the second time this has happened.

Car started to accelerate randomly and 2 seperate occasions while driving, car started to decelerate / brake randomly while driving.

Electric parking break and emissions light keep popping up. They says it’s the catalytic converter many people having the same issue.

Emission system problem & electric parking brake problem codes came up. Once pulled over vehicle would not disengage the emergency parking brake.

Malfunction: road mitigation system failed (rdm), lane keeping assist system (lkas) failed, and cruse control failed, after investigating the issue this is happening with multiple vehicles. Safety: yes, these all failed at the same time, poses significant safety issues for the diver, passengers, and other drivers due to nature of failure. Conformation: at this time no inspection of the vehicle has transpired. No other waning lamps or messages, prior to suddenly showing up today 6/18/25.

My vehicle will phantom brake and kick on the automatic emergency brake system without cause. It has done it as I was accelerating onto the freeway onramp and almost caused a collision with the vehicle behind me. There was nothing in front of me and no reason to brake. It has happened on several occasions.

1. 17. 25 my check engine light came on with the following lights: emissions system problem electric parking brake problem.

The following issues occur on a 2020 Acura Mdx with low 50k miles, maintenance was done regular whenever a maintenance schedule appear. For the past few years after purchasing the vehicle we started getting a non-start engine with the key fobs and automatic side mirrors did not open or close when parked. Brand new batteries were replace for the key fob and later the car battery and the issue occurs intermittently, this was brought to the attention of the dealership and each time (documented) that they were not able to reproduce when they turned off the vehicle, this was mid 2024 06-13-2024 and sporadically continues till this year 2026. The dealership did not test or trace the electrical system as they were told to reproduce the issue first as it will happen at that moment. A new recent event 2025 has also occur and was brought to the dealerships attention, a warning message indicating - electric parking brake problem follow by a emissions system problem will appear. This was also "reset" by the dealership and indicated it was safe to drive but event reoccurs every few months. A 2nd opinion to another mechanic indicated it can be the emergency brake system to be faulty and driving the vehicle when the message appears may cause an immediate stop, advised us to have the dealership reach out to the manufacture. No word from either for the past year. Any open recall for my VIN was done once we were notified and a new car battery replaced and new batteries in key fobs - issue continues. Please assist thank you.

Auto braking system engaged abruptly, without necessity. This occurred twice (December 2022 and November 2023) almost causing collisions on both occasions. The dealer could not reproduce the problem when it was brought in in December 2022 and said this could occur if the sensors are dirty and to ensure they are always clean. I have since done so, and the same thing happened again. There were no warning signs for this error prior to it occuring.

While braking into a parking spot, vehicle experienced sudden unintended acceleration. Brake did not engage, car rapidly surged forward over parking block, sidewalk and hitting building. Previously in day, car would not recognized key fob, would not unlock and would not start even though stepping on brake that would not depress. I had no control over vehicle,and this could have hit pedestrians on sidewalk or storefront. Thankfully no one hurt, and did not occur in traffic or on the road. The dealership was contacted immediately, and they declined to inspect vehicle, codes or edr statign that's not what they do. I have asked dealership 3 times. Insurance contacted immediately, and they to will not investigate, saying up to Honda and dealership. Honda stating they don't do investigations, and insurance should do that. Round and round we go. No one assisting. Auto body referred by dealership unable to investigate and do not have equipment to do so and stating dealership and Honda tech needs to do this investigation. Several messages displayed the day of incident prior to incident and electrical issues seem to have started immediately after recall or warranty work to reprogram auto stop function. First instance of electrical issue was on 4/1, when car would not open, or unlock even with new battery in key fob. This continued over next 3 weeks sporadically. 4/24 car would not start, displaying "must press down brake" to start, but brake would not depress. Finally worked. Same thing 4/25 in morning. In evening car would not unlock for some time, finally opened, then would not start displaying "key fob not detected". Finally started. Message remained displayed. 15 min ,after, when parking, car accelerated forward without warning. This is a short summary, and a detailed summary is available. Vehicle remains untouched at autonomy hoping to get investigation completed. Too scared to drive this vehicle now. .

On two separate occasions (December 2022 and April 2023), the collision mitigation system (cms) of our 2020 Acura Mdx improperly engaged. On the first occasion, the cms abruptly engaged the braking system without warning. There was no car in front of the car, but there was a car in a turn lane to the right of the car. There was no reason for the system to engage. Both the driver (my wife) and the passenger (daughter) reported back pain from the incident. The driver received physical therapy for the event. The dealer (gary force Acura) and Honda America were notified. The dealer examined the car and found no issues or failures. On the second occasion, the car was changing lanes at a slow rate of speed while approaching an intersection and a stopped car well in front of the Acura. The cms again abruptly slammed on the brakes in a manner not corresponding with the risk or danger of the situation. A collision with the car behind our car was fortunately avoided by the driver of the other car. The violence of the braking system caused damage to the braking system. No injuries were incurred. Again, the dealer and Honda America were notified, and the car was again examined. No issues or failures were identified outside of the brake repair. On both occasions, individuals were put at risk. The dealer was not able to reproduce the problem. The dealer said a cms warning to brake should have come on before the cms engaged. On both occasions, no warnings were observed until the actual braking event started. We are not comfortable driving the car, particularly with a student driver in the family. In most cases, we turn the cms off before driving the car. The intent is to dispose of the car due to concern associated with the cms.

The engine idle stop function is unreliable and often fails to restart the engine when the brake pedal is released. The vehicle will, suddenly and without notice, become inoperable and undrivable wherever it rests, whether at a red light or stop sign, in the middle of an intersection while making a left-hand turn, or on an entrance ramp to a highway, causing a dangerous situation for myself and other drivers. It takes several minutes to restart the engine and sometimes must be jump-started. The issue has been reported to my local dealership, and they said it is not covered.

Dealer says two warped rotors brakes pads are good there has been no abnormal breaking while driving the car. I feel this is a faulty rotor.

Car broke down 3 times on the road while driving, it show 12vbattery failure, abs failure nd started flashing lights on the dashboard nd broke down while driving. When first time it happened dealer said they have fixed the issue. It happened again MD yesterday is 3rd time. Vehicle is 19k miles only it. Pls help us getting this resolved. Dealers make false promises and it’s breaking down again and again on the road while driving which is very scary.