Acura TLX UB2
Weaknesses, engine ratings and buying advice
The second-generation TLX (UB2, 2021 onward) is Acura's most ambitious run at the sport-sedan class — above all in the Type S version with its 3.0-liter twin-turbo V6. Below it sits the more comfort-oriented K20C6, a 2.0-liter VTEC turbo. Both engines are modern, direct-injected, and powerful, but each brings its own concerns worth knowing before you buy.
The J30T, making around 355 hp, is the character engine of the Type S. Because it's new, long-term data is still thin, but a clear pattern shows up not in the engine itself but in the driveline behind it: the splines of the power transfer unit (PTU) can strip and disable all-wheel drive — a serious failure. Add a recall for FI-ECU software that can stall the engine, increased oil consumption from the turbo and direct injection, and a sticking turbo wastegate (code P2599 with limp mode). The K20C6 is the gentler 2.0-liter version with about 272 hp and a twin-scroll turbo; its themes are the typical fuel dilution into the engine oil, GDI intake-valve carbon buildup, slightly elevated oil consumption on early builds, and oil contamination of the intake tract from the PCV location.
In the chassis and electronics, the UB2 shares several weaknesses with the related MDX YD4. The splined joint in the SH-AWD transfer case wears silently, the 10-speed hesitates and engages late when cold (TSB 21-041), and the ELS audio crackles over Bluetooth and CarPlay due to faulty FAKRA connectors (TSB 23-030). The Advance trim's adaptive dampers can leak oil, especially on early 2021 cars; the touchscreen freezes or goes black — while the physical climate controls keep working — and wind noise appears around the A-pillar at highway speed. Many of these items are covered under warranty or extended programs.
The verdict: the TLX UB2 is an engaging, well-built sedan, and the Type S is a genuine statement — but the PTU wear and FI-ECU recall demand extra diligence when buying an all-wheel-drive Type S. A completed recall, an inspected AWD driveline, and a check of the dampers matter most. If you prefer things calmer, the K20C6 is easier to live with, though you'll still need to watch oil and carbon-buildup issues.
Generations
Engine Overview
The Acura TLX UB2 is available with 2 engine variants — from 272 to 355 hp.
The K20C6 is the comfort-oriented 2.0-litre turbo variant of the K20C family: twin-scroll charger, direct injection and i-VTEC with variable timing on both intake and exhaust cams, but at roughly 272 hp tuned far more gently than its Type R sibling. The character differs accordingly — strong, early-arriving torque for effortless cruising rather than a rev-chase, with a cultured, muted soundtrack lacking the hard Type R bite. Used both longitudinally and transversely across several models, it is regarded as a fundamentally solid design that comfortably clears 150,000 km with proper care. The killer detail is hidden: the crankcase ventilation (PCV) vents directly in front of an intake port, deliberately routing oil and fuel vapour toward the intake — an oil catch can pays off here long-term. The main everyday theme is fuel dilution of the oil on short trips and in the cold, plus the valve coking typical of direct injection over high mileage. Warm it up and keep the intervals honest, and you get one of the more unremarkable modern turbo petrols.
- !! Fuel dilution of the engine oil from 20,000 km
The 2.0 turbo dilutes the oil with fuel on short trips and in the cold, at times past the 2% warning threshold. Oil level appears to rise, viscosity drops. Aggravated by cold idling without warm-up.
Symptoms: Rising oil level on the dipstick, fuel smell in the oil, improved fuel economy in winter as a side effect of thinning viscosity. Confirmation only via lab analysis. - ! GDI carbon build-up on intake valves from 100,000 km
As a pure direct-injection engine the K20C6 builds carbon on the intake valves over high mileage. The unfavourably placed PCV vent in front of an intake port further promotes deposits.
Symptoms: Rough idle, sluggish response, in advanced stages misfires and stumbling. Professional intake cleaning is recommended roughly every 80,000 km. - ! Elevated oil consumption on early builds from 60,000 km
Some early units show elevated oil consumption; reports cite up to roughly 1 quart per 7,000 miles. Honda addressed isolated cases via a TSB. On well-kept engines usually inconspicuous.
Symptoms: Falling oil level between changes, occasional oil smell, in isolated cases an oil-pressure warning if the level is badly neglected. Check oil level regularly.
+ 1 more engine weaknesses + vehicle weaknesses
This 3.0-litre twin-turbo V6 is a modern, direct-injected performance engine producing around 355 hp. Being new, long-term durability data is still limited, but a genuine pattern is emerging: the driveline behind it fails, with the power take-off unit splines to the rear axle stripping and killing all-wheel drive without a warning light. Some units show elevated oil consumption early on, and a factory recall addresses an FI-ECU software fault that can stall the engine. Isolated turbo wastegate faults trigger limp mode. The core engine itself appears solid so far.
- !! AWD failure: power take-off unit (PTU) splines strip from 80,000 km
The splines between the transmission and the rear power take-off unit (PTU) fail, leaving the car in front-wheel drive only, with no warning light. NHTSA is investigating after 48 complaints. Repair requires transmission and PTU replacement.
Symptoms: Sudden loss of rear-wheel drive, often with a loud bang, followed by a transmission leak; sometimes whining/grinding, with no dashboard warning. - !! Recall: FI-ECU software can stall the engine
NHTSA recall 25V031000: a fault in the fuel injection control unit (FI-ECU) can cause an engine stall or loss of power. Affects 2021-2025 TLX Type-S (and MDX Type-S). Remedy is a free software reprogramming.
Symptoms: Sudden engine stall while driving or loss of power, usually without warning. - !! Elevated oil consumption (turbo, direct injection) from 30,000 km
The twin-turbo V6 can consume oil even when nearly new, with reports of about one quart per 3,000 miles. Acura recommends switching to 0W-30 and checking the oil level monthly. Persistent cases warrant a piston ring inspection under warranty.
Symptoms: Dropping oil level between changes, occasional low-oil warning, faint blue/oil smell under load changes.
+ 1 more engine weaknesses + vehicle weaknesses
Vehicle Weaknesses
| Weakness | Cost | |
|---|---|---|
| SH-AWD Transfer Case: Spline Wear Same issue as MDX YD4 — spline connection in SH-AWD transfer case wears silently. Type S with higher torque especially affected. Symptoms: No obvious symptoms until AWD traction loss, clunking during tight turns, vibration during quick lane changes from 50,000 km | High | |
| Adaptive dampers leak oil Adaptive dampers (Advance) can develop oil leaks, especially early 2021 models. Covered under warranty. TLS reset needed after replacement. Symptoms: Oil on front shocks, vehicle pulls to one side, ride harsher than selected from 40,000 km | Medium |
Top Reported Issues
Alternatives
Honda Accord XI
Mid-Size (2023–2026)
Mercedes-Benz CLE C236
Mid-Size (2023–2026)
Mercedes-Benz E-Klasse W214
Mid-Size (2023–2025)
VW ID.7 I
Mid-Size (2023–2026)
Citroën C5 X I
Mid-Size (2022–2026)
Genesis G70 IK-FL
Mid-Size (2022–2025)
Explore more
Known Problems and Issues +
A total of 14 weaknesses have been documented for the Acura TLX UB2 (2021–2025) — 8 engine-related and 6 vehicle-related. Typical issues affect Suspension, Gearbox, Electronics, Body. Considered reliable: K20C6 (2.0L VTEC Turbo).
TLX (J30T, 2021–2025) — Be Careful: AWD failure: power take-off unit (PTU) splines strip, Recall: FI-ECU software can stall the engine, Elevated oil consumption (turbo, direct injection). Power: 355 PS.
What to watch out for with the Acura TLX? See the detailed listing of all engine and vehicle weaknesses in the sections above.
Frequently Asked Questions
What problems and weaknesses does the Acura TLX UB2 have? +
What should I look for when buying a used Acura TLX UB2? +
Which engine is recommended? +
Which Acura TLX UB2 engine is the most reliable? +
Which Acura TLX UB2 engine is the most fun? +
Is the Acura TLX UB2 worth buying used? +
What horsepower variants are available for the Acura TLX UB2? +
Last updated: February 2026 · All information without guarantee