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Hyundai i30: i30 N DCT Judder Under Light Throttle

i30 N DCT Judder Under Light Throttle is a common transmission fault on the Hyundai i30 on the 2018 onward cars, and we rate it major. Putting it right costs $350 to $4,500 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 28 documented faults on the Hyundai i30.

Vehicle
Hyundai i30
Only on
Hyundai N
Years
2018 onward
Fuel
petrol
Gearbox
dct
System
Transmission

This page covers the Hyundai i30 as a model. Some faults only affect particular engines or build years — enter a plate below to narrow the list to one car.

All Hyundai i30 faults28 documented faults on this model

What you are looking at

No photograph available

We do not hold a verified photograph of the Clutch yet. We would rather show none than show a picture of a different part.

What goes wrong

The 8-speed wet dual-clutch N DCT fitted to the i30 N Performance exhibits a shudder or judder under light throttle application in urban driving, particularly during low-speed clutch engagement in 1st and 2nd gears. The calibration is optimised for track-focused response, making street-driving engagement abrupt and uneven. Hyundai issued TCU updates but the fundamental characteristic remains present to varying degrees in most examples and is widely documented by NZ and AU owners.

What you would notice

  • Judder or vibration under gentle throttle application in 1st and 2nd gear
  • Shuddering sensation when maintaining very low constant speed
  • Hesitation or lurch when transitioning between low gears in slow traffic
  • Behaviour is notably worse when transmission is cold
  • Symptoms reduced but not eliminated following TCU software update

How to check it

Where to look. N DCT transmission unit - clutch pack engagement, transmission control module calibration

  1. Test drive in slow urban traffic applying light throttle from rest and while holding low speed in 1st and 2nd gears.

  2. A vibration or judder through the drivetrain and seat is the key indicator.

  3. Confirm the vehicle has had the latest Hyundai N DCT TCU software update applied and request the dealer service record.

  4. Check DCT fluid service history for fluid replacement.

Parts involved: Clutch.

What it costs to put right

$350 to $4,500 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 car had any DCT or transmission software updates from Hyundai?”
  • “Does the transmission judder when driving slowly in traffic?”
  • “Has the DCT fluid been serviced?”
  • “Was this issue raised under warranty or with a dealer?”

Now check the Hyundai i30 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.

Hyundai i30 buyer questions

Is i30 n dct judder under light throttle serious on a Hyundai i30?

We rate it major and common on the Hyundai i30. The 8-speed wet dual-clutch N DCT fitted to the i30 N Performance exhibits a shudder or judder under light throttle application in urban driving, particularly during low-speed clutch engagement in 1st and 2nd gears. The calibration is optimised for track-focused response, making street-driving engagement abrupt and uneven. Hyundai issued TCU updates but the fundamental characteristic remains present to varying degrees in most examples and is widely documented by NZ and AU owners.

How much does it cost to fix on a Hyundai i30?

$350 to $4,500 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 Hyundai i30 years are affected?

Our research records this fault on the 2018 onward Hyundai i30. 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 in slow urban traffic applying light throttle from rest and while holding low speed in 1st and 2nd gears. A vibration or judder through the drivetrain and seat is the key indicator. Confirm the vehicle has had the latest Hyundai N DCT TCU software update applied and request the dealer service record. Check DCT fluid service history for fluid replacement. Look here: N DCT transmission unit - clutch pack engagement, transmission control module calibration