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Kia G6DC engine: known problems

Used in 3 guides · 3470cc petrol · 7 known problems

Displacement

3470cc

Layout

V6 NA

Fuel

petrol

Timing

Timing chain (no scheduled belt replacement)

Known problems7

Everything our guides list for the variants with this engine: the engine itself plus the gearbox and ancillaries it's paired with. Each shows which cars it's listed for.

Low

High fuel consumption / running cost

The naturally aspirated V6 is thirsty, especially in town and when loaded with seven occupants - real-world use often runs into the low-to-mid teens L/100km.

Fix: Not a fault; choose the diesel if economy/towing matter, the V6 if you want smoothness and simplicity.

Any · Ongoing fuel

Listed for: Hyundai Santa Fe TM

Low

FWD traction / torque steer when loaded

With 206kW through the front wheels only, the V6 can scrabble for traction or tug at the wheel on launch and in the wet, and it lacks the diesel's HTRAC AWD security for towing or loose surfaces.

Fix: Quality tyres and gentle throttle help; choose a diesel AWD if you need traction. Not a defect.

Any · ~$0-300

Listed for: Hyundai Santa Fe TM

Low

High fuel consumption / front torque-steer when loaded

The NA V6 is thirsty in a heavy 7-seat body and being FWD-only it can scrabble for traction or torque-steer under hard throttle when fully loaded. Not a fault, but a real ownership trait that pushed many buyers to the diesel/hybrid.

Fix: Nothing mechanical to fix; budget for fuel and drive smoothly. Choose diesel/AWD if you need traction or economy.

Any · ~$0

Listed for: Kia Sorento MQ4

Low

Engine mount and accessory pulley wear

At higher km the V6 can develop minor vibration from aging engine/transmission mounts and noise from the accessory belt tensioner/idler - common to high-km V6s, cheap to address.

Fix: Replace failed mount(s) and belt tensioner/idler as needed; diagnose by which mount has lost damping.

From 100k+ km · ~$300-1200

Listed for: Kia Sorento MQ4

Low

Fuel thirst / running cost

Real-world 12-14 L/100km; the larger 3.5 is no more economical than buyers expect. Not a fault.

Fix: Accept it, or choose the diesel for touring economy.

Any · Running cost

Listed for: Kia Sorento UM

Low

Ignition coils / spark plugs at higher km

Routine V6 ignition wear - plugs and coil packs eventually need replacing.