2020 Acura MDX problems

“While stopped at a stop light the auto restart feature engaged and shut the engine off. When the light turned green and I released the brake pedal the engine did not restart and the battery warning light illuminated. As cars were honking I activated my hazards, had to place the car in park and shut off/restart the vehicle. Luckily it restarted and I was able to proceed home. It activated again while stopped to get mail at mailbox and restarted with no issue. Mileage is 42668. Recall 23-001 PGMfi performed 8/2023. Battery replaced 12/2024.”

“My 2020 Acura MDX fails to restart after the Auto Idle Stop system shuts off the engine at stops. The vehicle stalls and will not restart in active traffic, including busy intersections and high-speed roads. This began about three years ago and now happens every day, leaving my family stranded in live traffic lanes at risk of a collision. On [XXX], the engine shut off and would not restart in the middle of the [XXX], with traffic moving around me at about 40 mph. Capitol Acura in San Jose diagnosed a failing starter motor and ordered a replacement under repair order [XXX]. The part has been on backorder since, with no delivery date. I escalated to American Honda / Acura Client Relations on October 13, 2026 (case [XXX]). On [XXX], Acura replied only that it is "still reviewing" my request. No loaner or alternate vehicle has been provided, and no repair timeline has been given. I am concerned this is a defect affecting other MDX owners: a starter that fails under frequent Auto Idle Stop cycling, combined with a parts shortage that leaves unsafe vehicles on the road. I request that NHTSA review this issue for a possible investigation or recall.”

“LKAS, forward collision, high beam all alerts are going off and have been told it's a camera system that gets over heated. This is not a easy fix and needs to be recalled to clear up the codes and alerts.”

“Engine turns off while in drive or stopped at a red light/stop sign. It has happened 7-10 times withing the last couple of months, but 3-4 times within the last week. Out of the four times it happened, my family's safety was at risk, because the car was in drive, and could've caused us to get into an accident. During the other occasions, we were moving in reverse and stopped at a stop sign. Complaint was made with Acura of Bay Shore in Long Island, NY, at which time an update of computer engine was performed but issue wasn't fixed due to back-order part that needs to be replaced. Unfortunately, just yesterday (August 13, 2026) car turned off at light causing a road hazard to vehicles and my family stuck in a large intersection. Multiple engine lights turned on, but I was unable to turn the car on or move it. approximately 10 min later, I was able to turn the car on and move it to safe location. I spoke to Acura of Bay Shore, and it is a known issue but till this date, isn't fixed. Vehicle is a hazard and can cause serious bodily harm/or death. thank you”

“The contact owns a 2020 Acura MDX. The contact stated that the vehicle was previously repaired under Technical Service Bulletins: 22-009, 22-024, and 23-002; however, the failure persisted following the repairs. The contact stated that while stopped at an intersection, the engine failed to restart after the Auto Start/Stop feature engaged, and the transmission independently shifted to Neutral (N). The contact shifted the transmission to Park (P) and pressed the Engine Start/Stop button to restart the vehicle. The vehicle was taken to the dealer, where it was determined that the starter required replacement. The dealer requested that the manufacturer replace the starter; however, the request was denied. The contact associated the failure with NHTSA Action Number: EA25004 (Engine and Engine Cooling). The failure mileage was 70,357.”

“Multiple errors Lane departure and advanced driver support, ACC LKAS, auto high beam, and braking system. Looking into this more i see lots of people with the same issue failing front facing camera and not a cheap fix. Is there any current investigations into this problem or a software upgrade? I clear the errors and they come back once car is turned off and back on. If no fix to the current system there should be a way to disable LKAS and ACC without spending $2000 to replace the system.”