Why does my Acura TLX Type-S clunk or surge at low speed?

Short answer: Many TLX Type-S owners feel a low-speed clunk or surge, especially in Sport. Warm fluid and Comfort mode often help. A true hang between gears is different—get that scanned.

Symptom: Clunk leaving a parking spot, surge when braking in Sport, or a small lurch in gentle stop-and-go.

What to check first

1. Try Comfort/Normal and see if the feel calms down.
2. Note whether it happens only cold or all the time.
3. Ask the dealer about fluid condition and any software updates.
4. If it hangs in neutral under throttle, treat it as a different, urgent issue.

Likely causes

1. 10-speed programming and Sport-mode mounts. Dynamic engine/transmission mounts stiffen in Sport, so low-speed shifts feel clunkier. Many owners call occasional parking-lot clunk normal once the fluid is warm.
2. Aggressive rev-matching on downshifts. Owners said surging under braking can be the transmission rev-matching to keep revs up in Sport. Trying Comfort/Normal reduces it for some.
3. Real slip or 2–3 hang (not the same issue). A true hang in neutral between gears or loss of drive is a different problem—see the Type-S transfer-case page and get it scanned.

What it usually costs

Owners in these threads were not quoted for a repair; most were told it was normal character.

Is it safe to keep driving?

Usually yes if it is only a mild clunk. No if it loses drive or hangs in neutral.

DIY or shop?

Drive-mode experiments and documenting symptoms are DIY. Internal transmission work is not.

Recalls, bulletins and complaints in plain words

• Recalls: NHTSA lists 5 recall(s) for the Acura TLX in these years, and none match this problem. Check your VIN at nhtsa.gov/recalls. If your car is part of a recall, the dealer fixes it for free.
• Plain words: The complaint count below shows how often owners reported problems that mention these words to NHTSA. A count is not proof of a defect.
• NHTSA complaints: 6 keyword-matched complaints for Acura TLX 2021–2025 (of 120 unique complaints queried, NHTSA complaints API by model year, queried 2026-11-06; keywords: clunk, surge, shift, hard shift, lurch). This counts complaints that mention these words. It is not a defect finding.

What owners report

• In TLX-S Transmission Surge/Clunk on Reddit r/Acura, a new 2023 Type-S owner at about 1,000 miles asked about surge under braking and a slip feel around 3–4.5k rpm. Replies pointed to Sport-mode behavior, stiff mounts, and timing pull under boost, and a 2021 owner with 40k miles said occasional low-speed clunk never went away even after a fluid change.
• In TLX Type-S Lurching? on Reddit r/Acura, a new Type-S owner in stop-and-go traffic felt a lurch when gently accelerating then braking. The dealer said it was working as intended. Another owner described a hard 3–2 downshift with a metal-on-metal clink that the dealer also called normal.

Quick tip

Separate Sport-mode manners from a real 2–3 hang. Video both if you are unsure.

Vehicle focus: Acura TLX Type-S 2021-2025 with the 10-speed automatic.

Safety / mechanic note

Any loss of propulsion in traffic needs a shop visit. Verify with a mechanic.