Acura TLX Transmission Problems

Transmission complaints by model year

Which parts fail

• Automatic transmission
  3
• Automatic transmission › Gear position indication (PRNDL)
  1

Components named in complaints (automatic and manual transmissions, CVT, axles, driveshaft, 4WD/AWD).

Mileage when the problem started

• Under 25k
  10064%
• 25k–50k
  2516%
• 50k–75k
  1711%
• 75k–100k
  106%
• 100k–150k
  32%
• 150k+
  11%

What owners report

While accelerating from 0 to 40 miles per hour, I experienced a loud bang come from the car. Turns out the splines were stripped between my transmission and transfer case. This was due to the drive shaft spinning while in park mode, as well as an opening between the transmission and transfer case that was spooling. My powertrain system was severely compromised; who knows what could've happened if I had kept driving the car in this condition? Something was waiting to inevitably fail beyond what had happened. Thankfully, this happened on an empty road close to home, but it could have happened anywhere. There were no warnings, lights, or anything, which was the strangest part. Thankfully, this $10k+ bill was covered under the manufacturer's powertrain warranty, but it seems to be a common issue with many newer Acuras. …

The transfer case splines sheared off in the transmission. The car is safe to drive but went from AWD to FWD as there is now no power being transmitted through the transfer case to the rear wheels. The dealership confirmed the issue was the transfer case by lifting the car and seeing if the rear wheels were getting power. They then tore down the transmission and found the splines were all gone from the transfer case. The component was not inspected by the manufacturer, police, insurance, or anyone else. There were no warnings or symptoms to the problem before the failure.

I drive a 2021 Acura TLX 2.0 L turbo 4 cylinder. I was driving to work on [redacted] on a busy street in Boyle Heights, Ca. When all of sudden I get a warning indicator "engine temp is high do not drive". Pulled over immediately. Good thing I was in the far right lane and was able to pull over and not stall or get rear ended by another vehicle behind me. There were no warning, symptoms and indicators of the engine's overheating. My vehicle has been in great condition prior with no major or minor issues with my vehicle. We took it to two dealerships for diagnostics. The head gasket blown, empty coolant reservoir, cracked engine block, and other parts of the engine were affected. What if I was on a highway and the car stalled. I could've been seriously injured or seriously injured someone else on the road. …

I am submitting this complaint in reference to NHTSA Defect Petition DP26001, opened March 6, 2026, investigating loss of all-wheel drive capability in 2021-2023 Acura TLX vehicles due to interfacing spline failure between the transmission and the power takeoff unit (transfer case). I am the owner of a 2021 Acura TLX SH-AWD with 55,300 miles. I purchased this vehicle on June 2nd, 2026. I have not yet experienced a failure, but I am registering as an affected vehicle owner given the known defect pattern documented in DP26001 and consistent with the 137,329-vehicle population identified in the NHTSA investigation. The failure mode as described in DP26001 involves stripping of splines at the transmission-to-PTU junction, resulting in sudden and complete loss of rear-wheel drive without warning lights or dashboard indication. …

The contact owns a 2020 Acura TLX. The contact stated that while operating the vehicle, the check engine warning light, the emission system failure, and electronic parking assist messages were displayed. Additionally, the AWD feature had become inoperable, making the vehicle difficult to steer. The contact stated that the failure was intermittent. After disconnecting and reconnecting the negative battery terminal, the system was reset and the failure was corrected, but eventually reoccurred. The cause of the failure was not yet determined. The local dealer and manufacturer were notified of the failures, but no assistance was offered. The failure mileage was unknown.

Transmission harsh and delayed gear engagement, sometimes it won't shift unless it's done manually, few times it didn't shift even though I shifted manually, I had to increase engine speed to about 5000 RPM so it shifts, transmission goes into neutral when trying to to accelerate while it's in drive and intermittent vibration caused by hydraulic circuit pressure issues, I've had the vehicle since it had 7900 miles and all these issues been present in the car since then, the car now have 29000 miles and it's only getting worse. These issues have been reported by a lot of Honda/Acura vehicles owner with the 9 speed transmission

The contact owns a 2019 Acura TLX. The contact stated while driving approximately 45-50 MPH, the vehicle inadvertently shifted into neutral causing the vehicle to slow down and stop in traffic. The contact was able to pull over and call a tow truck to take the vehicle to the dealer. The vehicle was not diagnosed or repaired. The contact stated that the emissions warning light was illuminated. The manufacturer was not notified of the failure. The approximate failure mileage was 45,000.

I am filing a formal safety complaint regarding the execution of NHTSA Recall 24-002 (Connecting Rod Bearing Replacement) by an authorized Acura dealership, and a fundamental safety flaw in Acura's official Service Bulletin for this recall. My vehicle underwent "Repair #1" under this recall, which involved opening the engine block and replacing the rod bearings due to a factory defect that causes metal-on-metal wear. However, upon picking up my vehicle, I discovered the dealership left the old, dirty oil filter attached to the engine. I reviewed Acura's Service Bulletin 24-002 and realized the "Required Materials" list explicitly omits a new oil filter for Repair #1. Because dealerships strictly follow this bulletin for warranty reimbursement, they are systematically leaving old filters on engines that just received new bearings. …

Related recalls (2)

NHTSA investigations