986 of the
4,699 complaints filed about the Acura MDX
are about the transmission —
100% of everything owners reported.
The worst model year for it is 2001.
986
Complaints
100%
Share of all complaints
30
Crashes
2
Fires
Transmission & Drivetrain complaints by model year
Heard a loud clunk followed by several small clunks when accelerating. Dealer confirmed the transmission & PTU are damaged and the car is no longer AWD. This issue is becoming more widespread with Acura MDXs and is a very expensive repair. From dealer: “FOUND DRIVESHAFT CAN TURN IN PARK WITHOUT TURNING FRONT WHEELS. THIS INDICATED TRANSMISSION AND PTU SPLINES ARE DAMAGED”
NHTSA complaint #11762849 — an unverified report by a vehicle owner.
The car was being driven as normal and while at a stop light the car shut off and alerted the driver with a transmission error code. The car would not start for about 30 mins after the incident. When we took it to be looked at by the dealership we were told that it was related to code P07E4. The dealership reset the system and the code and returned the car back to me. They stated that if this happened again they would need to replace the transmission. My concern is that this happens again while driving at a higher speed or in an area where it is not safe such as a highway or major intersection or road. It's also concerning that a major component of a vehicle would need replacement at normal mileage which is currently at 111,400 miles.
NHTSA complaint #11762003 — an unverified report by a vehicle owner.
While driving home on a Sunday afternoon, out of nowhere, a very loud pop sound happened followed by grinding. We were so worried that my husband pulled over thinking we had done major damage to the car somehow. Visual inspection under the car yielded nothing leaving us puzzled. No warning lights came on before, during, or after. We had it taken to the Acura dealership in Fairfield, Ohio. The car was still within warranty at this time, and they found nothing nor could they replicate the sound. My husband explained that it sounded to be transmission related. They chalked it up to a loose tie rod end which they “tightened” to solve all of our problems. We left the dealership and took the car home experiencing no further problems. Fast forward to the winter of that same year we realized that no matter what mode we put the car in we didn’t have AWD. Still no warning lights. The following spring, approximately 20,000 miles after experiencing the first loud pop and grind, we started getting error messages on our user dashboard. “All wheel drive system problem. Only front wheels may be powered. See your dealer”. We immediately scheduled a service appointment with the same Acura dealership. Within minutes of having the car examined on the lift the Acura certified technician found the problem to be the AWD transfer case and additionally the transmission. Stating we would need to replace both. They came back with a quote of approximately $18,000 for a new transmission, transfer case, labor, and all associated materials, for which we declined. Currently seeking help for recall as we do not believe a transmission/ transfer case should fail so quickly under normal driving circumstances.
NHTSA complaint #11760987 — an unverified report by a vehicle owner.
Factory seal allows water to seep into the internal coupling cavity. The water mixes with the factory grease, creating a rusty, muddy brown fluid that eventually washed out and leaks from the casing. Over time, this moisture causes the interfacing splines between the transmission and the transfer case to strip and shear off completely.
NHTSA complaint #11760810 — an unverified report by a vehicle owner.
The auto shutoff and restart system has failed multiple times causing the car to shutoff in the middle of traffic. This has happened in traffic on the interstate, on surface streets and in the drive thru line. Safety was put at risk as had to restart car in middle of traffic multiple times; once car would not restart at stop light. This could have caused an accident as vehicle was at a full stop with cars coming up from behind in the road. Dealer has replaced starter and relay twice. In less than 2 years, I'm on my third starter. Dealer has inspected vehicle multiple times. No warning messages or other symptoms before occurring. When the engine would not restart at intersection, warning message of "transmission system problem, apply parking brake when parked. See your dealer" Could not restart engine.
NHTSA complaint #11760772 — an unverified report by a vehicle owner.
My 2025 Acura MDX suffers from a severe safety defect regarding the Auto Idle Stop (auto start-stop) system. When the vehicle comes to a complete stop at intersections or traffic lights, the engine shuts off as intended. However, upon releasing the brake pedal to accelerate, the engine completely fails to auto-restart.Instead of restarting, the vehicle drops out of the auto-restart sequence entirely, shifts itself out of drive, and displays a critical safety message on the dashboard: "To start engine: Brake + Push".This completely strands the vehicle in live traffic, forcing me to manually shift into Park, press the foot brake, and push the engine start button while traffic accumulates behind me. This creates an immediate rear-end collision hazard.The dealership has already attempted to diagnose and repair this issue under warranty by replacing both the vehicle's battery. This hardware replacement did not fix the problem; the failure continues to occur unpredictably less than a week (and 25 miles) after replacement. The root cause appears to be a software, Powertrain Control Module (PCM), or sensor tracking defect where the vehicle fails to recognize it is in an automated restart sequence.I am filing this complaint to be officially included in the ongoing NHTSA Engineering Analysis EA25004 regarding Honda/Acura Auto Idle Stop failures, as the current hardware recall remedies are entirely ineffective for the 2025 model year.
NHTSA complaint #11759336 — an unverified report by a vehicle owner.
On my 2017 Acura MDX SH-AWD with approximately 112,000 miles, the engine experienced a sudden catastrophic failure while I was traveling at highway speed. The vehicle abruptly lost power, the accelerator became unresponsive, smoke came from the vehicle hood and exhaust area, and multiple warning lights illuminated. The failure occurred with no advance warning and created a serious safety risk because I suddenly lost propulsion while traveling approximately 75 mph in highway traffic. An independent repair facility inspected the vehicle and reported that connecting rod/bearing failure resulted in catastrophic engine damage. I was advised that two connecting rods/bearings failed and caused holes in the engine block, with a rod/component also damaging the A/C compressor. Oil subsequently leaked from the damaged engine. Prior to the sudden failure, I did not have warning lights or other indications suggesting an imminent engine failure. The warning lights appeared during or immediately after the loss of power. The vehicle has been inspected by a repair facility and the engine requires replacement. The vehicle/failed components can be made available for inspection upon request. I am particularly concerned because Acura has previously recalled certain vehicles for connecting rod bearing failures that can result in engine damage, stalling, or loss of motive power. My vehicle is the same model year and has experienced an apparently similar catastrophic connecting rod/bearing failure, but my VIN is not currently included in the recall 23V-751. I am submitting this complaint so NHTSA can evaluate whether the affected population may extend beyond the VINs currently covered in that recall. This is also linked to NHTSA’s new investigation PE25008.
NHTSA complaint #11759081 — an unverified report by a vehicle owner.
At 75,000 miles I noticed that the vehicle was losing fluids on the bottom. The fluid color was a reddish color. I took it into Acura for a diagnosis and I was told that the seal between the drivetrain and transmission has worn and is causing all of the fluids to be leaked out of the car. They told me it would be $10,000 to replace the drivetrain and transmission because the a repair cannot be made.
NHTSA complaint #11759193 — an unverified report by a vehicle owner.
2023 ACURA MDX TYPE S. 28k miles. While merging onto highway, I sped up and at 25 mph, I heard a loud metal clunk from underneath the car. Car still drove and functioned as a two wheel drive instead of AWD. Went in for service and was told that the transmission and Power train Unit would need to be replaced and will be replaced under powertrain warranty by Acura.
NHTSA complaint #11758889 — an unverified report by a vehicle owner.
Vehicle lost rear traction and leaking fluid from the transmission or front differential. Brought vehicle to dealer. They replaced transmission and transfer case.
NHTSA complaint #11757168 — an unverified report by a vehicle owner.
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
NHTSA complaint #11756994 — an unverified report by a vehicle owner.
Was driving arround corner and felt a shudder like I had run over something, the felt front tires loosing traction and car jerked into next lane. Took to dealer and they diagnosed a failure of output shaft from transmission to awd transfer case, currently at dealer getting transmission awd assembly replaced.
NHTSA complaint #11757047 — an unverified report by a vehicle owner.
The contact owns a 2022 Acura MDX. The contact stated that while driving at an undisclosed speed, there was an abnormally rough grinding sound coming from the vehicle. There was no warning light illuminated. The vehicle was towed to a dealer, but the failure was not duplicated. The vehicle operated normally for a while. The vehicle was taken back to the dealer to be diagnosed. The dealer determined that there was a failure within the transfer case, causing the vehicle to be operable only in Front Wheel Drive. Additionally, there was debris inside the transmission. The vehicle was repaired out of pocket. The manufacturer was notified of the failure. The failure mileage was 80,000.
NHTSA complaint #11756323 — an unverified report by a vehicle owner.
The contact owns a 2022 Acura MDX. The contact stated that drops of fluid were discovered on the floor of the garage. The contact stated that while driving at an undisclosed speed, the vehicle failed to properly accelerate while depressing the accelerator pedal. The vehicle was taken to the local dealer for diagnosis, and the contact was informed that transmission fluid was leaking due to a failure of the Power Take Off (PTO) unit and transmission spline, causing the transmission to overheat and leak fluid. The contact was informed that the transmission and PTO unit needed to be replaced. The vehicle was not yet repaired. The manufacturer was not notified of the failure. The failure mileage was 97,000.
NHTSA complaint #11755172 — an unverified report by a vehicle owner.
My 2023 MDX Type S is currently at Mungenast St Louis Acura. Transfer Case and Transmission are both being replaced at roughly 56,000 miles. I made a turn and heard a loud noise. Because I was under acceleration my car was hard to control when it happened. Scared me and immediately let off the gas.
NHTSA complaint #11754719 — an unverified report by a vehicle owner.
The contact owns a 2022 Acura MDX. The contact stated that while the vehicle was receiving a routine oil change, the rear wheels failed to rotate. No warning lights were illuminated. The vehicle was taken to a dealer where it was diagnosed and determined that the transmission and transfer case needed to be replaced. The contact stated that the drive shaft was moving freely while in park. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was approximately 134,984.
NHTSA complaint #11753972 — an unverified report by a vehicle owner.
Took car in for oil change and service tech saw that there was transmission fluid leaking. They then found that the splines were sheared off going into the transfer case and transmission. We received new transmission and transfer case. So far everything is working. We did not get any warning that there was an issue until we took it to the dealership. Putting in the case as this seems to be a common issue on type s models.
NHTSA complaint #11753342 — an unverified report by a vehicle owner.
Vehicle exhibited a fluid leak at the rear of the engine near the transmission/transfer case junction. An independent shop is currently evaluating; suspected power take-off unit failure. This matches the failure pattern described in NHTSA Defect Petition DP26001 covering 2022-2023 Acura MDX and 2021-2023 Acura TLX for interfacing spline failure between the transmission and the rear-wheel-drive power take-off unit. Separately, while pulling out into traffic, the vehicle hesitated and failed to accelerate as commanded, chugging briefly before delivering power. This nearly resulted in a collision. No warning lamps or messages appeared at any time. Whether this drivability event and the fluid leak share a cause is UNKNOWN, but I am reporting both given the open defect petition on this component. Vehicle at approximately 75,000 miles, outside powertrain warranty by roughly 5,000 miles. Manufacturer declined assistance when contacted. Component is available for inspection upon request. Sudden loss of all-wheel drive without warning is a safety concern in Michigan winter driving conditions Repair has been quoted at approximately $3,600 for the transfer unit alone, plus labor, with no manufacturer assistance offered.
NHTSA complaint #11753157 — an unverified report by a vehicle owner.