Hyundai & Kia G4KJ 2.4L Engine Guide: Which Vehicles, Warning Signs, Replacement
The G4KJ is Hyundai and Kia's 2.4L direct-injection (GDI) engine from the Theta II family. It was used in some of the most common Hyundai and Kia models on Canadian roads, so it is also one of the engines we get asked about most.
Which vehicles use the G4KJ?
There are two generations. They look similar, but they are not the same engine, so the year of your vehicle matters.
Gen 1
- Hyundai Sonata 2011–2014
- Hyundai Santa Fe 2011–2012 and Santa Fe Sport 2013–2016
- Hyundai Tucson 2011–2015
- Kia Optima 2011–2015
- Kia Sorento 2011–2015
- Kia Sportage 2013–2016
Gen 2
- Hyundai Sonata 2015–2019
- Hyundai Santa Fe / Santa Fe Sport 2017–2020
- Hyundai Tucson 2019–2021
- Kia Optima 2016–2020
- Kia Sorento 2017–2020
- Kia Sportage 2017–2022
Some models used other engines in the same years (for example a 2.0L turbo or a V6), so always confirm with your VIN.
Common warning signs
The issue owners hear about most is wear in the bottom end (the connecting rod bearings). Signs to watch for:
- A knocking sound that gets louder as engine speed rises
- Oil level dropping faster than normal between changes
- Metal particles in the oil
- An oil pressure warning light
If you hear a knock, stop driving and have the engine checked. Running a knocking engine can turn a planned replacement into a breakdown.
Check for recalls first. Hyundai and Kia ran recalls and warranty extensions on some Theta II engines. Before you pay for an engine, check your VIN with a Hyundai or Kia dealer or on the Transport Canada recall database.
Our G4KJ engines
- Brand new bare long blocks (block and head assembly), Gen 1 and Gen 2
- 6-month warranty, unlimited km (parts only)
- No core charge. You keep your old engine
- Pickup near Calgary, free delivery within 50 km, or flat-rate shipping across Canada
Shop G4KJ engines or send us your VIN and we'll confirm the right one for your vehicle.