2026 Acura MDX Owner Complaints

On October 1, 2026 at approximately 5:45am, while driving my 2026 Acura MDX, I stopped at a red traffic light on a busy street. The vehicle's Auto Idle Stop system shut the engine off as designed. When the light turned green and I attempted to proceed, the engine failed to restart. The vehicle became disabled in an active traffic lane in the dark and I was unable to move it for several minutes. I attempted to restart the vehicle multiple times. It took several attempts to fully the shut the vehicle down and restart it before I was able to actually restart the car and resume driving. Because the vehicle was unexpectedly immobilized in traffic when surrounding vehicles began moving, I was placed at significant risk of being struck from behind or involved in a serious collision -- particularly because it was dark and all my lights were off while attempting to restart the car. My best assessment is that the failure involved the Auto Idle Stop / Restart system, starter system, electrical system or related control components. The exact cause is unknown at this time. The vehicle and all related components remain available for inspection upon request -- at least until the dealership starts working on my car to diagnose and hopefully fix the problem. (There are other reports of this happening with earlier models.) There were no warning lights, warning messages or obvious symptoms immediately before the failure. The Auto Idle Stop system appeared to operate normally when the engine shut off at the red light; the failure occurred when the system was supposed to restart the engine. The problem has not yet been reproduced or confirmed by my Acura dealer. I advised my dealership that the car failed to restart and left me stranded in active traffic. I was initially told that it could be several weeks to months before they could inspect the vehicle and I escalated the matter to the head of the service department due to the serious safety issue.

NHTSA ID

11768794

Incident

Oct 1, 2026

The contact owns a 2026 Acura MDX. The contact stated that while driving 30 MPH and adjusting the interior rearview mirror, the mirror detached and was hanging down. The vehicle was taken to the dealer, where it was determined that the windshield and the interior rear-view mirror needed to be replaced. The contact declined to pay for the repair because the vehicle was brand new. The dealer repaired the rear-view mirror without replacing the windshield; however, the failure recurred approximately 8 months later. The dealer was notified by phone and informed the contact that there was no available appointment to repair the vehicle. The contact believed the failure was a factory defect. The manufacturer was notified of the failure by phone and a case was filed. The contact was awaiting a callback from the case manager. The failure mileage was approximately 1,800.

NHTSA ID

11768571

Incident

Jan 2, 2026

Mileage

1,800 mi

Blind spot warning system stops working when the it is hot outside or inside of the vehicle

NHTSA ID

11762463

Incident

Dec 15, 2025

I am writing to formally escalate an unresolved matter regarding my 2026 Acura MDX Technology, purchased on XXX, from Piazza Acura of [XXX]. As a loyal Acura customer of over nine years and currently on my fourth lease, this experience is both unexpected and unacceptable. Since shortly after purchase, the vehicle has exhibited persistent and unresolved performance issues, most notably harsh and inconsistent gear shifting and a pronounced vibration in the accelerator pedal. Despite multiple service visits and significant time invested, these concerns remain unresolved. I have repeatedly been advised that these conditions are “normal characteristics” of the vehicle due to adaptive transmission behavior—an explanation that is inconsistent with my prior ownership experience across multiple MDX models (2017, 2020, and 2023) and does not align with reasonable expectations for a vehicle in this class. To be clear, the vehicle in its current condition fails to meet reasonable standards of quality, reliability, and merchantability for a $62,000+ luxury vehicle. Additionally, the vehicle did not exhibit these issues during pre-purchase test drives, indicating these conditions are neither inherent nor acceptable. The service history is summarized below: April 18, 2026 – Piazza Acura of Ardmore Issues: Installation of a sport heated steering wheel (contractually owed), slow acceleration, harsh shifting, vibration in the accelerator pedal, GPS inoperable Service time: 1 day April 24, 2026 – Piazza Acura of Ardmore Issues: Installation of the correct heated steering wheel, continued transmission and vibration in the accelerator pedal concerns Service time: 6 days May 11, 2026 – Elite Acura (NJ) Issue: Accelerator pedal vibration Service time: ~1.5 hours June 15, 2026 – Piazza Acura of Ardmore Issues: Ongoing vibration in the accelerator pedal, Blind Spot Information System problem warning Service time: 2+ days (ongoing) INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ID

11750166

Incident

Apr 9, 2026

The blind spot monitor becomes inoperable when you leave the car in an open area with sun and warm weather on the car. If you take the car and place it in a garage or during nighttime the monitors will come back on. This problem was brought to the dealer, Gettel Acura, [XXX] in XXX. They replaced a Chip and told me it was fixed. It has not been fixed and the inoperable monitor makes it dangerous, especially on the interstate highway. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ID

11748188

Incident

Apr 20, 2026

Google on-board gives a persistent error that the MMI and car driving technology firmware cannot be completed. Service center says it’s known and they can’t do anything. The car is supposed to have voice control over vehicle temperature and functionality — it does not. It frequently will not automatically connect to a wireless Apple Car Play or Google Auto connection. Firmware is also supposed to communicate w car speed, etc. to make Acura Assist driving more safe.

NHTSA ID

11708181

Incident

Nov 15, 2025

2026 Acura MDX with Acura Factory A Spec issued plastic floor mats. Accelerator pedal gets stuck behind the floor mat resulting in uncontrolled wide open throttle. Had to physically put my foot behind the pedal and pull pedal away from floor. Afterwards tried a few times to repeat the issue, 3/5 times was able to reproduce stuck pedal. Top of the drivers plastic floor mats, right side, has a U cut out for the accelerator pedal. This needs to be trimmed another 1/2” or more to stop the issue. Could result in severe or fatal consequences.

NHTSA ID

11700349

Incident

Nov 10, 2025

2026 Acura MDX with 3.5 L V6 (J35Y-series) experienced connecting-rod bearing failure and total engine loss at 1,920 miles. Vehicle currently at dealer. Appears identical to failures under NHTSA PE25-008 (2016-2020 models)

NHTSA ID

11698786

Incident

Oct 21, 2025

I have experienced the vehicle not unlocking when the key fob is near(in my pocket) the vehicle and my hand is touching the door handles. The vehicle is designed to unlock when the key fob is in close proximity while hands are on the handle. This is a safety/security concern because in an emergency, the vehicle does not function as it is intended to.

NHTSA ID

11676602

Incident

Jul 21, 2025