I am submitting this complaint regarding a transmission failure involving my 2021 Acura TLX, which I believe presents a significant motor vehicle safety defect. The transmission experienced a premature and unexpected failure that resulted in a substantial reduction in vehicle performance, including a loss of power delivered to the rear wheels and a corresponding reduction in vehicle directional control. At the time of the failure, the vehicle's handling characteristics changed unexpectedly, creating a potentially hazardous operating condition. The loss of rear-wheel power adversely affected the vehicle's stability and responsiveness, particularly during acceleration, lane changes, and other driving maneuvers where predictable vehicle control is necessary for safe operation. This condition significantly increased the risk of a crash and exposed both the vehicle occupants and the motoring public to an unreasonable safety hazard. Upon researching this issue, I discovered that transmission failures and related drivetrain defects have been reported by other owners of 2021 Acura TLX vehicles. The existence of multiple similar complaints suggests that this may not be an isolated incident but rather a recurring defect affecting this vehicle model and year. The failure occurred despite the vehicle being maintained in accordance with manufacturer recommendations and without any misuse or modification that would reasonably contribute to such a catastrophic drivetrain failure. A transmission component that affects vehicle propulsion and directional control should not fail under normal operating conditions. Given the nature of the defect and its direct impact on vehicle safety, I respectfully request that the federal safety agency investigate this issue to determine whether a broader safety-related defect exists within the 2021 Acura TLX population. If such a defect is confirmed, Acura/Honda should be required to provide an appropriate remedy.
2021 Acura TLX transmission problems
30 complaints (40% of all complaints for this car).
- owner complaints
- 30
- of this car's complaints
- 40%
- crashes
- 0
- recalls
- 0
Which part fails
Owners did not name a specific part.
At what mileage
Complaints by mileage at the time of the problem.
Acura TLX transmission problems in other years
Related recalls
No recalls on record for this model year.
Related investigations
All wheel drive allegation
The Office of Defects Investigation (ODI) has completed its review of a Petition dated January 9, 2026, requesting an investigation into the loss of the optional all-wheel drive capability in model year (MY) 2021-2023 Acura TLX and MY 2022-2023 Acura MDX vehicles. The Petition alleges failures in the interfacing splines between the front wheel drive transaxle and the rear wheel drive power take off unit. Failure of these splines prevents the transfer of drive power to the rear axle, making the vehicle front wheel drive only. The Petition further alleges that this failure reduces vehicle directional control. Most traditional AWD systems utilize mechanical and passive measures. These systems have the tendency to distribute torque along the path of least resistance, such as a wheel that has lost contact with the ground or is on a low friction surface such as ice. To compensate for this, many manufacturers use the brake system to redirect torque to the wheels with more traction. However, in this style of AWD system, a failed drive shaft or similar disconnection prior to the brakes often results in drive power being lost to the disconnected component. The consequence of this loss is the inability to maintain speed with surrounding traffic which increases the risks of collisions and injuries to the vehicle occupants. The Subject Vehicles are built upon a platform that was designed primarily as Front Wheel Drive (FWD). The SH-AWD system functions more as a performance enhancement feature rather than a stability feature. Even if the SH-AWD is nonoperational, the vehicles retain full mobility via FWD. In addition, the Vehicle Stability Assist (VSA) remains functional, ensuring directional stability through traditional engine and brake-based traction control. Although the condition raised by the Petitioner may degrade the vehicleâs performance characteristics, there is insufficient information to indicate a potential unreasonable safety risk. ODI reviewed 62 Vehicle Owner Questionnaires (VOQs) and several EWR Field Reports alleging the loss of SH-AWD and its impact on the driving dynamics of the subject vehicles. During its analysis, ODI determined that the failure is localized to the mechanical interface between the FWD transaxle and the PTU. Specifically, the failure is the shearing or stripping of the interfacing splined shafts between the FWD transaxle and the PTU, resulting in a permanent loss of torque transfer to the rear of the vehicle. Upon reviewing the technical details of SH-AWD, ODI has found that this failure does not result in any loss of motive power or lead to a loss of vehicle control. Several complaints indicated that the operators were unaware of the mechanical fault until encountering a low friction surface or the condition was identified by a technician during routine maintenance. The SH-AWD system lacks any form of direct feedback for monitoring real time torque transfer to the rear wheels. Therefore, the system will continue to display information indicating power is being supplied to the rear wheels even when power is actually only supplied to the front wheels. ODIâs review did not identify sufficient evidence to indicate that the misinformation has presented a safety issue in the field. ODI did not identify any reports of loss of motive power or vehicle control that could be attributed to the loss of SH-AWD. ODI is not aware of any crashes involving the Subject Vehicles that resulted from the loss of SH-AWD. After thoroughly assessing the material submitted by the Petitioner, consumer complaint information in the federal safety agencyâs databases, and other relevant information already in possession of the Agency, the federal safety agency has not found sufficient evidence to indicate that the loss of AWD as alleged by the Petitioner is likely to present a safety related defect that would warrant a formal investigation. After full consideration of the available information, and in view of the federal safety agencyâs enforcement priorities, the Petition is denied. A denial report will be posted in the Federal Register. The closing of the petition does not constitute a finding by the federal safety agency that a safety related defect does not exist, and the agency reserves the right to take additional action if warranted by future circumstances. The Petition can be viewed at under ODI Number 11712885.
DP26001
What 2021 Acura TLX owners say
Most recent owner complaints, unedited.
My car shakes and rocks like a boat over every bump and when i make turns the car dips really bad and bounces around. It’s been doing this since i got the car and purchase a warranty i could not use from sports Mazda. Its unsafe at high speeds and jerks when switching lanes. I continuously do the alignment every 2-4 weeks. And the toe gets adjusted and it goes right back to the issue. Acura told me this is how their cars drive and it feels unsafe to drive
Vehicle losing traction while driving. Confirmed by [xxx]'s acura in [xxx]. Confirmed: transfer case with bad transmission. Vehicle now inoperable. Information redacted pursuant to the freedom of information act (foia), 5 u.s.c. 552(b)(6)
I am submitting this complaint regarding a major drivetrain failure in my 2021 Acura TLX Type S SH-AWD with approximately 86,643 miles. My vehicle experienced a complete loss of AWD. The front two wheels are receiving power, but the rear wheels are no longer receiving power. An independent mechanic initially diagnosed a transfer-case/drivetrain failure and advised that the transmission may also be involved. I then took the vehicle to OH Acura of Temecula, where the Acura dealership independently diagnosed the vehicle with transmission and transfer-case failure. The service manager confirmed that my independent mechanic’s diagnosis was accurate. The dealership provided a repair estimate of approximately $16,000. I am concerned because the federal safety agency previously opened investigation DP26-001 regarding reported failures involving the transmission and transfer case in 2021–2023 Acura TLX SH-AWD vehicles. My vehicle is now experiencing a complete loss of AWD consistent with the issue described in that investigation. I also experienced an unusual grinding noise on September 21, 2026, which lasted approximately five minutes before stopping. I was subsequently told the noise was caused by worn spindles. The noise has not returned, and I am not claiming that issue was related to the drivetrain failure. Acura declined goodwill assistance, citing lack of documentation for transmission maintenance. The vehicle is outside its original warranty. I am submitting this complaint so the federal safety agency has a record of my vehicle’s actual failure and complete loss of AWD and can consider it alongside other reports involving this vehicle and drivetrain configuration. I can provide the VIN, dealership diagnosis, repair estimate, and supporting documentation if requested.
The transfer case and transmission splines have been stripped causing the car to be FWD only. The issue was confirmed by the dealer, and both the transfer case and transmission were replaced under warranty. The car shuddered, followed by a drivetrain noise for a few seconds. No warning lights or messages appeared when the incident occurred. The issue occurred at approximately 26,574 miles on the odometer.
transfer case leaking fluids at 73,000 miles
Transmission and transfer case failure. Noticed a very small amount of fluid leaking and took to dealership. Dealer informed me that I was "lucky" to have noticed and that the transfer case spline failure had occurred. Notified that the problem could lead to sudden loss of all wheel drive and loss of vehicle control, vehicle slipping, and oversteer. DP26001 had indicated that these issues are a safety concern and could lead to an accident. I had noticed instability in certain issues where the rear of the car did not feel firmly planted when cornering (oversteer). Dealer indicated that both the transmission and transfer case need to be replaced. I was ~8000 miles within powertrain warranty. Parts are on a national backorder which indicates a widespread issue. No warning lamps or indication of seal failure that leads to stripped splines off the shaft due to the fluid leak. the federal safety agency does not understand how the Acura SH-AWD system interacts with vehicle dynamics and handling, and loss of the rear wheel drive and its impact on oversteer would be absolutely NO DIFFERENT than a rear sway bar breaking under load while cornering. I experienced this exact symptom on [XXX] where the road goes from 3 lanes to 2 lanes on a sweeping right hand curve. This is where I had felt like I may lose control of the vehicle, the rear of the car started to come around and I had to steer into the slide to regain control of the vehicle. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
I'm losing power than normal all of a sudden. When I step on the gas after light hits green in sport and sport plus mode my car losses traction even when traction control is on, and I hear a loud clunck sound. After the the loud clunck sound the car losses RPM while driving I step off the gas and step back on it and the RPM goes back to normal again.
I took this vehicle to get serviced in the summer of 2025. I recently joined an Acura Type S (2021+) group on Facebook and learned that the issue is quite prevalent. I had to have the transmission and transfer case replaced due to transmission issues and traction issues
On July 7th 2026 I was driving home, came to a stop light at normal speed, when the light turned green I took off at normal speed and I heard a huge cluck / bang from underneath the car and it bogged and didn’t want to move. I then stepped on the gas because of the Car behind me getting to close and my traction control light started to flash and the car started to shake and feel very uncomfortable to drive . After that I realize only the two front wheels of the car were working and even at low cruising speeds the car feels very unsafe and shakes and hear noises I never heard before the part that is causing this is the transfer case and transmission thus there are many other people who have had this same issues ranging from 21 to 23 tlx type s with 15k miles to 100k miles
Questions about the 2021 Acura TLX transmission
Does the 2021 Acura TLX have transmission problems?
Owners have filed 30 complaints about the transmission of the 2021 Acura TLX, 40% of all its complaints, more than any other problem.
At what mileage do 2021 Acura TLX transmission problems start?
Not enough complaints include the mileage to tell.
Was there a recall on the 2021 Acura TLX transmission?
There is no recall for this problem on this model year.
What year does the Acura TLX have bad transmission?
The Acura TLX model years with the most transmission complaints are 2015 (161 complaints), 2021 (30 complaints) and 2017 (18 complaints).
Is there a class action lawsuit over the Acura TLX?
Yes. Class action says Honda and Acura keyless entry makes cars easy to steal and asks for theft protection (November 12, 2026).
Other 2021 Acura TLX problems
Brakes 11Driver assistance 10Electrical 10Airbags 8Suspension 8Engine 6Fuel system 6Steering 3Body 1Lights 1Tires 1Visibility 1
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