Photo: M 93, CC BY-SA 3.0 de, via Wikimedia Commons
2 faults documented by at least two sources, listed by version then by mileage at onset when known.
2 known faults
Several sites describe jerking when pulling away and hesitation from the i30's seven-speed DCT gearbox, mainly on the 1.4 T-GDi versions (between 40,000 and 80,000 km according to Autodoc, an approximate value) and on 2018-2020 cars according to AutoPartsPro. No official recall has been found for the 1.4.
Hyundai recalled PD i30s built between late 2018 and 2020 (dates vary by source: from 23 or 25 October 2018 to mid or late 2020): the pre-filter of the tandem pump can become blocked, which can interrupt the oil supply, damage the engine and cause a loss of brake assistance. The Auto Motor und Sport article cites the 1.6 litre i30s; we were unable to confirm the exact list of versions. The work is carried out by the dealer. Check with Hyundai, using the serial number, that the recall has been carried out.
Fixed free of charge by a dealer and not counted in the reliability score: ask for proof the work was done (invoice, or a VIN check at a dealer).
Several sites describe jerking when pulling away and hesitation from the i30's seven-speed DCT gearbox, mainly on the 1.4 T-GDi versions (between 40,000 and 80,000 km according to Autodoc, an approximate value) and on 2018-2020 cars according to AutoPartsPro. No official recall has been found for the 1.4.
No recurring fault documented for: 1.0 T-GDi 120.
An OBD scanner plugged in under the steering wheel shows stored fault codes, even with warning lights off: useful during the test drive.
Compare prices of parts for the Hyundai i30 III (timing, brakes, filters) to estimate the repairs to plan for.