2019 Acura MDX problems

“Dec. 16, 2025, took Acura into the dealership because Check Engine light kept coming on. They did a full inspection and said I needed to have the purge valve replaced and that it was nearing time to have other services: transmission service, front transfer case, rear differential, brake fluid, timing belt, spark plugs, fuel service. Took the diagnostic to my brother who is a mechanic and he started the work starting with the purge valve. He had already done spark plugs with oil change in Oct. 2026. Fast forward to Apr. 2026 my car starts making a weird knocking sound upon accelerating. My brother was in hospital at this time so I didn't want to stress him so I just stopped driving it. I had the other stuff done at shop he recommended but the knocking sound didn't stop. Brother told me to get it diagnosed again. Now Sept. 2026, they said I need a whole new engine, and that Acura would not cover it! What!? They felt so badly they didn't even charge me for the diagnostic. I took it to two other shops just to see if there was anything else that could be done but they all told me the same thing. It's a 2019 how on earth could it need a new engine. I've gotten ALL…”

“the camera system located above the rear view mirror failed and caused a warning light for the lkas system. adaptive cruise control, lane keeping did not work because of it. the unit had to be replaced. this seems to be a fairly common issue with this mdx version, based on forums”

“While driving, the vehicle experienced a sudden internal mechanical and electronic transmission failure. Without warning, the vehicle shifted itself directly into Park while navigating the busy intersection of [XXX] and [XXX]. This caused a complete loss of propulsion and left the vehicle entirely immobilized in the middle of a high-speed junction. The vehicle could not be moved, creating an immediate, severe highway safety hazard that required an emergency 911 police response to manage traffic and protect the vehicle from being rear-ended. The dealership scan tool later pulled diagnostic code P0730 (Incorrect Gear Ratio) along with multiple clutch performance failures (P07A4, P07A2, P07A8).”

“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 NHTSA Action Number: EA25004 (ENGINE AND ENGINE COOLING); and related the failure to the action number. The failure mileage was 1,000.”

“The subject 2019 Acura MDX model includes the tech package which adds several safety features that function through a windshield mounted camara/radar. The system has malfunctioned and none of the safety features are working. The dash displays the following messages: Collision Mitigation System Problem Adaptive Cruise Control Problem Lane Keeping Asist Problem Road Departure Mitigation System Problem automatic headlight system problem At the bottom of the dash, I see Brake System, Crash Warning and Lane Departure lights on as well. Acura is charging $2,319 to replace this unit in addition to a $270 diagnostic fee. This issue is widely reported as a significant issue in several model years for the MDX and should be part of a safety recall. The Acura technician acknowledged this issue is common. I should add this is the second major electronic issue with this MDX within the last several months. The prior issue was multiple system failure warnings that Acura determined were caused by a faulty wiring harness at a $1,604 cost, plus a $255 diagnostic fee. Please note I am the original owner of the vehicle and it has never been in a collision. Additionally, the system…”

“The contact owns a 2019 Acura MDX. The contact stated that while driving at an undisclosed speed, several unknown warning lights illuminated, and the vehicle stalled. The contact was able to drive to the residence after the failure. An independent mechanic was contacted and attributed the failure to the fuel pump. The contact associated the failure with NHTSA Campaign Number: 23V858000 (Fuel System, Gasoline); but the vehicle was repaired under the recall approximately 2 years ago. The contact stated that the failure was caused by an improper recall repair. The dealer was contacted and diagnosed the vehicle with fuel pump failure. The contact was informed that the fuel pump replacement only had a 12-month warranty. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 60,000.”