At a red light or stop sign, my MDX switches into Neutral without me knowing it. When I press the gas to go, my car won't move. Other vehicles behind me almost hit me as they expect me to go. I can't switch into drive. I must turn off car and then turn it back on. I feel this is very dangerous. This happens about once a week now. The MDX was just in for service and recalls a few months ago. Nothing was noted about the engine on the reports.

- Hanover, MA, USA

The contact owns a 2020 Acura MDX. The contact stated that occasionally, while driving at various speeds, the vehicle stalled. There was no warning light illuminated. Additionally, while the vehicle was stopped at a traffic light, the Auto Idle START/STOP failed to operate as designed, and the vehicle failed to restart. The vehicle was taken to a local dealer; however, the cause of the failure was unknown. Upon further investigation, the contact related the failure to an unknown recall; however, the VIN was not included. The manufacturer was made aware of the failure. The failure mileage was approximately 10,000.

- Columbus, OH, USA

When the vehicle stops and the idle auto-start/ stop engages, the vehicle will automatically go into neutral and cannot be restarted until the vehicle is turned off then back on. This has happened at both stop lights and on the highway and almost caused a very serious rear end accident.

- Plainfield, IL, USA

The idle stop feature does not work correctly. A couple times the car did not restart while stopped at a red light. Had to put into park and took about a minute to restart.

- Sandown, NH, USA

I own a 2020 Acura MDX. The Auto Engine Idle Stop system failed to operate while depressing the accelerator pedal while at a stoplight. The vehicle shifted automatically to neutral and would not let me switch to drive. I just recently purchased this car (less than two weeks). Based on what i see online and all the complaints on here, this is a known issue. However when i contacted my local Acura they acted as if they never heard of this issue and they want to diagnose my car at my expense. The mileage on my vehicle is between 31,000 and 32,000. I purchased this vehicle to accommodate my newborn granddaughter. Now, I don't feel like its the safe vehicle its advertised to be. This is a very dangerous thing that is happening, how many complaints need to be submitted before the manufacturer is held accountable.

- Orlando, FL, USA

1. The car accelerates by intself. The accelaration is like "hiccups". When reversing and changing to D gear, it takes longer than usual for the accelarion to take effect. Yes, car is available for inspections 2. It is dangerus because it gets the hiccups even at high speeds. If it is a serious engine problem, which seems like it is, could cause an accident. 3. The car was taken to the dealership for 3 recalls but it got worse after the recalls were fixed. Supposedly the recalls were supposed to fix the issues. We have not taken it back yet. 4. There is no lights or warnings when it does it.

- Javksonville, FL, USA

The contact owns a 2020 Acura MDX. The contact stated that on several occasions, while coming to a stoplight, the vehicle lost motive power. There was no warning light illuminated. The vehicle was able to restart. The vehicle was taken to the dealer; however, the vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 46,000.

- Philadelphia, PA, USA

connecting rod bearing failure confirmed by independent mechanic. No alerts or warning lights. Problem just showed up and engine started knocking on acceleration.

- Glencoe, IL, USA

On multiple occasions when the car is stopped at a light, in traffic or at a stop sign and the auto idle stop feature is engaged the car will shut off and not restart for up to 1 minute. We have always been able to get it to restart but feel it is dangerous to be stopped so long in moving traffic.

- Southington, CT, USA

On Aug 8th at 3:32pm (81F and sunny), I stopped at a red light with the auto idle engine feature on. When I lifted my foot off the brake to drive the car, the car shifted into neutral and completely shut down and would not restart immediately. I attempted approximately 8 times to restart the car for 3 minutes before it successfully restarted. This poses a significant safety hazard for myself, my children, and others on the road. This is the 6th time this has happened and I have previously filed a NHTSA report # 11533671 with the same issue. Acura has been unable to diagnose and recreate the problem and is refusing to do any further work. It has been brought into their dealership on 3 separate occasions (July 2023, September 2024, August 2025). Prior to this occurring, there were no warning symbols, the car started fine without issue, and the battery has been checked and confirmed in working order.

- Pine Brook, NJ, USA

I own a 2020 Acura MDX. On two separate occasions, the Auto Engine Idle Stop system failed to operate while depressing the accelerator pedal while at a stop. Several unknown warning lights were illuminated on the instrument panel. The vehicle shuts off and the I had to manually restart the vehicle after the failure. I have not contacted the dealer yet but based on what I have found here I am not the only one that this is happening too. It is awful to be stopped in rush hour traffic and having people honking at me and potentially be the cause of an accident. The vehicle has not been repaired. The failure mileage was approximately 35,000 and 38,000 miles.

- Fuquay Varina , NC, USA

The contact owns a 2020 Acura MDX. The contact stated that on three separate occasions, the Auto Engine Idle Stop system failed to operate while depressing the accelerator pedal while at a stop. The contact stated that several unknown warning lights were illuminated on the instrument panel. The contact stated that the vehicle shut off and the contact had to manually restart the vehicle after the failure. The contact called and informed the dealer of the failure. The contact was then referred to the manufacturer for assistance with the repair. The contact was provided a case number and referred to the dealer to order the part for the repair. The contact made multiple attempts to reach the dealer but had not received a response. The vehicle was not repaired. The failure mileage was approximately 44,000.

- Somers, NY, USA

When idle stop is on and I come to a stop, the car shuts off and switches to neutral. It has to be put in park to start it back up. This is a safety concern because the vehicle is essentially stalled until you're able to put it in parked and restart it, which could cause an accident. The dealer is aware of the problem as it's been discussed the last two times that I've taken my vehicle in for recalls. According to the dealer, there is a recall for this issue but it's not for 2020 MDX, it's for 2022-2025.

- Allen, TX, USA

I am writing to formally express my concern regarding a recurring issue with the Auto Start/Stop feature in my 2020 Acura MDX. This feature, which is intended to improve fuel efficiency, has instead caused unexpected and unsafe engine shutoffs while the vehicle is in operation. On multiple occasions, the vehicle has failed to restart promptly after the engine shuts off at a stoplight or in traffic, creating a serious safety hazard. The delay or failure to restart can leave the car temporarily disabled in active traffic, placing both myself and other drivers at risk.

- Mckees Rocks , PA, USA

At 101,841 miles, noticed ticking coming from the engine as it was idling. Acura of Limerick dealership diagnosed the issue coming from the bottom of the engine as a rod knock. They feel the problem is internal to the engine and suggest replacing the engine at my, I the owner's cost. After reviewing blogs and information on recalls on the internet, this issue seems in line with other rod bearing issues with this 3.5L V6 engine. But my Vin is not identified as having the recall issue? This seems incorrect as my Vin should be covered as it seems to be the same problem.

- Phoenixville, PA, USA

Auto Idle Stop issue where engine did not restart. Occurred multiple times in April/May of 2024 and Vehicle Stability Assist Code U3006-16 appeared on the Infotainment screen. Taken to dealer who was unable to replicate the problem. The U3006-16 code appeared again in February 2025 but the car did not experience the restart issue at that time. The U3006-16 code appeared again on April 6, 2025 while exiting a freeway after a 20 minute drive and the engine did not restart after Auto Idle Stop engaged at the second intersection. Taken to dealer and unable to replicate the problem and supposedly cleared the codes. On May 21, 2025 the U3006-16 code appeared again while exiting a freeway after a one hour drive but the car did not experience the restart issue at that time. Took car to dealer who checked a bunch of things and cleared the code,

- Simi Valley, CA, USA

My car has been going into neutral when in the autostop. The only way to get out of it is to turn it off and back on. It's incredibly dangerous. I almost got into a horrible accident. It happens suddenly and without warning.

- Cortlandt Manor, NY, USA

Email Acura did an update to software for vehicle stalling, but the problem isn't fixed. I have notified the dealer twice and no return call. I am a widow, travel alone and am afraid this vehicle will fail when I'm alone. I was slowing to stop at a stop sign and the car just shut off.

- Six Mile Run , PA, USA

I stopped at a red light and when I went to pull of the car cut off. I had to restart the car to pull off. This is the second time that this has happened.

- Brooklyn, NY, USA

My Acura MDX 2020 had an issue in which the automatic start-stop system sometimes not manage to start the engine after stopping.

- Asian Or Pacific Islander, CA, USA