2019 Acura MDX: start-stop system problems

5 of the 193 complaints about the 2019 Acura MDX describe start-stop system problems.

owner complaints: 5
of this car's complaints: 3%
recalls: 0

Is there a fix? 14 service bulletins cover this area of the car. See below

Start-stop system problems by model year

2025
41
2020
9
2019
5
2018
3
2017
1

What owners say

Filed Oct 27, 2026 · Engine · 90,000 miles · FL

The contact owns a 2019 Acura MDX. The contact stated that while operating the vehicle, the engine failed to restart after the Auto START/STOP was engaged. The contact stated that while at a stop light, the engine failed to automatically restart after releasing the brake pedal. The contact shifted to park(P) and restarted the vehicle. The contact stated that the failure had occurred on several occasions. Additionally, while the contact’s wife was driving, the vehicle stalled and had to be manually restarted. The local dealer and the manufacturer were notified of the failure. The contact stated that the vehicle had experienced the failure listed in the federal safety agency Action Number: EA25004 (ENGINE AND ENGINE COOLING). The failure mileage was 90,000.

Filed Sep 17, 2026 · Engine, Fuel system · PA

issue occurring with automatic start/stop function. car stalls on occasion trying to restart, goes into neutral, even though battery is new and in good condition. hard to replicate and occurs randomly. car has to be turned off and on again. this is the 4th time this has happened over the course of 3 years. seems to be happening to others based on forums as well.

Filed Oct 21, 2025 · Engine · 1,000 miles · TX

The contact owns a 2019 Acura MDX. The contact stated that while at a stoplight with the Auto START/STOP feature activated, the vehicle failed to restart after releasing the brake pedal. The contact stated that the vehicle was able to be restarted approximately 5 minutes later. The failure had occurred on several occasions. The local dealer was notified of the failure, but the cause of the failure was not yet determined. The manufacturer was not notified of the failure. The contact was made aware of the federal safety agency Action Number: EA25004 (ENGINE AND ENGINE COOLING); and related the failure to the action number. The failure mileage was 1,000.

Filed May 18, 2024 · NY

The auto start/stop feature of the vehicle activated on the exit ramp of a highway, it did NOT restart the car but disabled all use and automatically shifted to neutral and would not power down, shift into another gear, or do anything. My wife had our children in the car during a high traffic time of day and my vehicle was disabled for approximately 5 minutes. Other cars exiting the highway at a high rate of speed had to go around my vehicle to continue. This is the second occurrence like this and previous “repairs” was the dealership just replacing the battery. This is the second time my family has been put at risk. The vehicle is available for inspection and there is a call in to the local dealership who has nobody available to speak with me until Monday.

Filed Mar 18, 2022 · Electrical, Fuel system · KS

On several occasions when auto start/stop is engaged the vehicle will shift into neutral on its own upon restart. The engine will just rev and not go back into drive until you put it in park and then drive again. This has caused us to stall in front of a semi and 2 other vehicles. The dealer has replicated the issue on multiple occasions and is now there for a 3rd time. First 'fix' was charge the battery Second 'fix' was adjust exhaust and transmission valves Third 'fix' is replacing the fuel pump There was a 2019 recall for Acura MDX but this VIN does not show up for that.