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Mazda Mazda3: SKYACTIV-Drive AW6A-EL Torque Converter Lock-up Shudder

SKYACTIV-Drive AW6A-EL Torque Converter Lock-up Shudder is a common transmission fault on the Mazda Mazda3 on the 2019 cars, and we rate it major. Putting it right costs $200 to $3,800 at New Zealand independent workshop rates. Below is what goes wrong, the symptoms to notice on a test drive, where to look, and what to ask the seller before you hand over any money. It is one of 37 documented faults on the Mazda Mazda3.

Vehicle
Mazda Mazda3
Years
2019
Fuel
petrol
Gearbox
auto
System
Transmission

This page covers the Mazda Mazda3 as a model. Some faults only affect particular engines or build years — enter a plate below to narrow the list to one car.

All Mazda Mazda3 faults37 documented faults on this model

What you are looking at

A cutaway automatic transmission torque converter showing the internal turbine and stator.Example of the part — not this vehicle

A torque converter, sectioned. The lock-up clutch inside is what shudders.

No machine-readable author provided. BerndB~commonswiki assumed (based on copyright claims). · CC BY-SA 3.0 · Wikimedia Commons

What goes wrong

The 6-speed SKYACTIV-Drive AW6A-EL automatic transmission exhibits torque converter lock-up clutch shudder at steady cruise between 60 and 110 km/h when the converter operates in slip-lock mode. The condition presents as a rhythmic drivetrain vibration felt through the floor and seat. Mazda issued TSB guidance specifying mandatory drain-and-fill with Mazda ATF-FZ fluid as first remedy. Fluid change resolves early cases; severe or long-neglected cases require torque converter replacement.

What you would notice

  • Rhythmic shudder or judder through floor and seat at 60–110 km/h steady throttle
  • Vibration ceases immediately when accelerating or lifting off throttle
  • May initially be mistaken for wheel imbalance or road surface vibration
  • Symptom worsens progressively as ATF degrades with age and mileage

How to check it

Where to look. Torque converter lock-up clutch, AW6A-EL automatic transmission unit

  1. Test drive at a steady 80–100 km/h on smooth sealed road under light constant throttle to provoke shudder.

  2. Check ATF condition and service history for any fluid changes specifying Mazda ATF-FZ.

  3. Scan for transmission fault codes.

  4. Confirm ATF has been changed within the last 60,000 km.

Parts involved: Torque converter.

What it costs to put right

$200 to $3,800 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

Ask the seller

  • “Has the automatic transmission fluid ever been changed, and with what fluid?”
  • “Have you noticed any vibration or shudder at highway cruise speeds?”
  • “Has the car been to a Mazda dealer for any transmission-related service or TSB?”

Now check the Mazda Mazda3 you are actually looking at

Everything above is true of the model, and it is free. What it does not tell you is whether THIS car has been looked after: its odometer history and whether the reading has ever gone backwards, whether there is still money owing on it, whether it has been reported stolen, how many owners it has had and what it is really worth today. That comes from the official records for that plate. Enter the plate for the free details, or get the full history and a market valuation from $13.49.

Not sure what you would be paying for? See what a full KickTyres check includes.

Where this comes from

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.

Mazda Mazda3 buyer questions

Is skyactiv-drive aw6a-el torque converter lock-up shudder serious on a Mazda Mazda3?

We rate it major and common on the Mazda Mazda3. The 6-speed SKYACTIV-Drive AW6A-EL automatic transmission exhibits torque converter lock-up clutch shudder at steady cruise between 60 and 110 km/h when the converter operates in slip-lock mode. The condition presents as a rhythmic drivetrain vibration felt through the floor and seat. Mazda issued TSB guidance specifying mandatory drain-and-fill with Mazda ATF-FZ fluid as first remedy. Fluid change resolves early cases; severe or long-neglected cases require torque converter replacement.

How much does it cost to fix on a Mazda Mazda3?

$200 to $3,800 at New Zealand independent workshop rates. That figure is for this job on its own. A car showing the symptoms on this page is usually worth either walking away from or negotiating down by at least the repair figure.

Which Mazda Mazda3 years are affected?

Our research records this fault on the 2019 Mazda Mazda3. Build dates move around, especially on imported cars, so treat the range as the years to look hardest at rather than a guarantee either way. The official records tell you the exact build and first registration date for the car in front of you.

How do I check for it before I buy?

Test drive at a steady 80–100 km/h on smooth sealed road under light constant throttle to provoke shudder. Check ATF condition and service history for any fluid changes specifying Mazda ATF-FZ. Scan for transmission fault codes. Confirm ATF has been changed within the last 60,000 km. Look here: Torque converter lock-up clutch, AW6A-EL automatic transmission unit