2024 Acura MDX

On June 3, 2022, the Office of Defects Investigation (ODI) opened Preliminary Evaluation PE22005 after the agency received VOQs and several field reports concerning the Auto Idle Stop (AIS) feature on 2016-2019MY Honda Pilot vehicles. The complaints allege that the engine fails to restart on its own from a complete stop at a traffic light or road intersection with the AIS function engaged. The subject vehicles are equipped with a 3.5L engine with a 9-speed automatic transmission. On January 6, 2023, Honda released service bulletins 23-008 and 23-009. These service bulletins address the failure to restart issue in the 2016-2019MY Honda Pilot vehicles, as well as the 2015-2020 Acura TLX, 2016-2020 Acura MDX, 2019-2022 Honda Passport, and 2020-2023 Honda Ridgeline vehicles. The repair outlined in the service bulletins is a two-stage countermeasure to remedy the issue. The first stage is a Programmed Fuel Injection (“PGM-FI”) software update. The second stage is only deployed if the software update fails to remedy the issue. The second stage, depending on the model and model year, consists of replacement of the starter assembly, starter relays, and a valve adjustment. Additionally, Honda extended the warranty coverage to 10 years with unlimited mileage for vehicles requiring the second stage component replacement. ODI continues to receive complaints of the AIS failure to restart, with many complainants alleging the campaign countermeasures had been completed.NHTSA has reviewed Honda's Information Request Letter responses involving warranty claims, lawsuits, and consumer complaints in addition to ODI's own data. This Engineering Analysis is being opened to further consider the potential safety defect, including gathering additional data regarding Honda’s service campaign efficacy. ODI is additionally expanding the scope to encompass all vehicles addressed in Honda’s service bulletins 23-008 and 23-009 as well as newer model year vehicles, which are substantially similar to the vehicles covered by the service campaign. To review the ODI reports cited in the Opening Resume ODI Report Identification Number document, go to NHTSA.gov.

The vehicle is showing LOW SPEED BRAKING CONTROL and BRAKE SYSTEM PROBLEMS, it is also throwing DTC Codes B2600-97; B2627-96; B2630-96; B2637-11; P2583-76 and P2583-97, as I consider the vehicle unsafe to drive or operate and it is a leased vehicle I took it to the same Acura dealer I leased the vehicle from, in order to have it repaired and put back to a normal operating status and make it safe to drive and operate. I took it to the dealer, advantage Acura of Naperville, on Friday October 9, 2026. The dealer is refusing to repair the braking failure under the manufactures warranty, as the vehicle only has 31thousand miles on it, and it still is within the manufactures warranty period.

NHTSA ID

11770480

Incident

Oct 9, 2026

VIN: [XXX]: 2024 Acura MDXComponents: Engine, Electrical System, Powertrain (Auto Idle-Stop)Ref Investigation: NHTSA EA25-004 (Upgraded from PE22-005) Dealer: Acura Carland ([XXX])SAFETY DEFECT SUMMARY:Severe safety hazard involving the Auto Idle-Stop system. The vehicle repeatedly shuts off at stops (intersections, traffic lights) and fails or struggles to restart, leaving it stranded with zero motive power in active traffic and creating immediate collision risk. DEALER FAILURE & PROTOCOL DEVIATION:Under warranty, Acura Carland diagnosed excessive starter electrical draw and replaced the starter motor. This was a superficial fix. Per Honda/Acura technical directives (e.g., TSB 23-009 / NHTSA [XXX] and [XXX]), high starter current draw during idle-stop restart stems from root mechanical drag (valve clearances) and faulty relays. Replacing only the starter ignored the root cause, leading directly to repeat failure.The identical failure recurred. Upon returning to Acura Carland, dealership personnel dismissed my concerns, disregarded published technical notices and federal investigation references, and refused to escalate to Honda Technical Information & Support (TIS) or a Field Technical Specialist.NHTSA EA25-004 NEXUS:Directly matches active investigation EA25-004 (2.2M Honda/Acura 3.5L vehicles). ODI specifically noted restart failures persist even after software updates and starter motor replacements. My vehicle demonstrates that 2024 MDX models suffer the identical vulnerability and dealers are performing inadequate component swaps. RELIEF REQUESTED:Incorporate VIN [XXX] into EA25-004.Mandate American Honda enforce root-cause dealer repair protocols (valve adjustments, starter relays).Compel a safety recall and full warranty extension covering all Auto Idle-Stop, ignition, valve train, and starter components. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ID

11767973

Incident

Feb 2, 2026

The contact owns a 2024 Acura MDX. The contact stated that while driving approximately 20 MPH and driving over construction steel plates on the roadway, the brakes independently engaged while the accelerator pedal was depressed. The contact stated that the failure could have caused a rear-end crash while driving at faster speeds with other vehicles nearby and posed a risk to her 1-year-old child seated the car seat in the second-row rear seats. The BRAKE warning light was illuminated. The manufacturer was made aware of the failure by telephone. The failure mileage was approximately 21,642.

NHTSA ID

11761883

Incident

Sep 3, 2026

Mileage

21,642 mi

The windshield on this 2024 MDX must be replaced because of the rear view mirror coming loose from the windshield. Acura is dragging their feet on correcting this dangerous situation of preventing the ability to see or use the rear view mirror.

NHTSA ID

11759431

Incident

Aug 15, 2026

I am reporting a potential safety defect involving the rear windshield glass on my Acura MDX. The rear windshield unexpectedly shattered while the vehicle was stationary, with no known impact or contact with an outside object. I was present when the glass shattered and immediately took multiple photographs and videos before the vehicle was moved. Based on what I observed, the glass appeared to break outward rather than from an outside object striking the vehicle. I later drove the vehicle from my home to the Acura dealership after being advised to do so. By the time the vehicle was inspected, portions of the shattered glass were understandably missing. The dealership later identified an area of missing glass as a possible “point of impact,” although I witnessed the event and there was no impact. I am submitting this complaint because I am concerned that the rear glass may have failed spontaneously and could represent a safety issue. Unexpected glass shattering could potentially occur while a vehicle is being driven and could startle a driver, expose occupants to broken glass, or impair visibility. I am also aware that Acura has previously issued technical service information regarding rear windshield glass on certain RDX vehicles shattering without external impact. I understand that my vehicle is an MDX and may not be covered by the same issue, but I believe the circumstances warrant documentation and review for a possible pattern.

NHTSA ID

11756025

Incident

Jul 6, 2026

Went to get into my 2024 Acura MDX parked car this morning temperature around 68 degrees and noticed the back window of my 2024 MDX had shattered out. There was a large section of glass missing and the glass looks as if it was pushed from the inside out. The vehicle had not been driven or started since the last evening. It seems as though this was a problem with prior Acura models in previous years. Went to the dealer and talked to the technician who said it is not covered under Acura warranty. This is definitely a safety issue as I could have been driving down the interstate when this happened putting my life and others in danger. I can only assume this is an issue Acura is aware of with the class action lawsuit that had been filed.

NHTSA ID

11754436

Incident

Aug 3, 2026

The contact owns a 2024 Acura MDX. The contact stated that while driving at an undisclosed speed, a loud banging sound was heard coming from the vehicle. The contact discovered that the sunroof had unexpectedly shattered. Additionally, while driving at an undisclosed speed, a supplemental restraint system warning message intermittently displayed, advising the contact to contact the dealer. The vehicle was taken to the dealer; however, the failures could not be duplicated. The vehicle was not diagnosed or repaired. The dealer was also contacted regarding the shattered sunroof; however, the vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 29,112.

NHTSA ID

11738118

Incident

May 15, 2026

Mileage

29,112 mi

Our infotainment system stopped working and when we took it one of Acura’s authorized dealers they told us that back half of the car is flooded and that has shot down all the electronics including the infotainment system. They also gave me a bill of $10K USD to fix the leak and replaced damaged electronics. Their argument is that the car was parked outside and that caused this issue. This has never come up in any of our previous maintenance visits where Acura certified dealerships always check our car and tell us that everything is okay.

NHTSA ID

11734918

Incident

Apr 13, 2026

Service Bulletin - Under certain circumstances, after coming to a stop and the idle stop feature engages, the vehicle may not automatically restart. In other circumstances, vehicles may experience a slow crank or fail to start under hot ambient temperature conditions.

Dealer Message - Under certain circumstances, after coming to a stop and the idle stop feature engages, the vehicle may not automatically restart. In other circumstances, vehicles may experience a slow crank or fail to start under hot ambient temperature conditions. The customer should be able to restart the vehicle by selecting Park and pushing the ENGINE START/STOP button.

Tech Line Summary Article - Customers are complaining of a clicking noise from front of vehicle while turning at low speeds. This is a temporary solution to address the issue.

Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2024-2026 MDXs with a client complaint of the Malfunction Indicator Light (MIL) on with the DTC P0441 (EVAP System Purge Flow Malfunction) stored. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to you attempting a repair of any kind.

Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2024-2026 MDXs with a client complaint of the Malfunction Indicator Light (MIL) on with the DTC P0441 (EVAP System Purge Flow Malfunction) stored. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to you attempting a repair of any kind.

Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2024-2026 MDXs with a client complaint of the Malfunction Indicator Light (MIL) on with the DTC P0441 (EVAP System Purge Flow Malfunction) stored. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to you attempting a repair of any kind.