IsItAGoodCar
Reliability Guide

Common Problems with the
2018 Kia Soul

We've identified 2 known issues that can affect the 2018 Kia Soul. None are considered critical, but they're worth knowing about before you buy.

2
Known Issues
0
Serious
2
Moderate
0
Minor

All Known Issues

Electric Power Steering (MDPS) Flexible Coupler Wear

ModerateSteering

The motor-driven power steering (MDPS) column contains a small star-shaped polyurethane flexible coupler that cushions the motor drive gear. Over time, heat and mechanical fatigue cause the plastic teeth to degrade, disintegrate, and create noticeable free play. Drivers experience an annoying clicking or knocking through the steering wheel when changing direction or crossing uneven surfaces. While replacement parts are inexpensive, replacing the coupler requires dropping the steering column and partially dismantling the motor housing.

Est. Repair Cost: £180–£350
Warning Signs:

Noticeable knocking or clicking sound when rocking the steering wheel left and right while parked, Vague on-centre steering response and small dead spot at motorway speeds, Vibration through the steering column when travelling over rough tarmac or rumble strips

What to Inspect:
  • With the engine running at a standstill, gently oscillate the steering wheel 10 degrees in either direction and feel for free play or clicking
  • Listen near the footwell directly beneath the steering column for mechanical play when steering load reverses
  • Confirm the power steering warning light extinguishes promptly after engine startup
Verified by IsItAGoodCar Research TeamUpdated

1.6 CRDi Diesel Particulate Filter (DPF) and EGR Valve Soot Clogging

ModerateExhaust & Emissions

The 1.6-litre CRDi diesel engine is engineered for motorway cruising and thermal efficiency, but many Souls were purchased as short-distance urban runarounds. In repeated stop-start driving, exhaust temperatures never reach the threshold required for passive DPF regeneration. Unburnt soot accumulates within the particulate filter and recirculating exhaust gas deposits carbon sludge across the EGR valve pintle. Sticking EGR valves cause hesitation under acceleration, black smoke, and eventual DPF blockage that triggers limp-home mode.

Est. Repair Cost: £300–£1,100
Warning Signs:

Illuminated DPF warning symbol or check engine light on the instrument cluster, Noticeable flat spot and sluggish acceleration below 2,000 rpm, Engine entering reduced-power limp-home mode during motorway acceleration

What to Inspect:
  • Check the instrument cluster before and after the test drive for DPF or engine management warning lamps
  • Take the car on a dual carriageway and accelerate firmly from 50 to 70 mph in fourth gear to confirm smooth boost delivery without hesitation
  • Examine the oil dipstick level to ensure it has not risen above the maximum mark due to repeated failed DPF active regenerations
Verified by IsItAGoodCar Research TeamUpdated

Buying Tips for 2018 Kia Soul

  • Inspect the steering column for a knocking or clicking sensation when rocking the wheel, signalling flexible coupler wear in the motor-driven power steering unit
  • On 1.6 CRDi diesel models, inspect the exhaust tailpipe and diagnostics for soot accumulation or DPF regeneration fault codes caused by repeated short journeys
  • Check rear suspension trailing arm bushes and coil springs for corrosion or fracturing, particularly on cars driven regularly over UK speed humps
  • On Soul EV electric models, check the rapid charging port latch mechanism and verify high-voltage battery state of health via onboard dashboard menus
  • Examine exterior alloy wheels for severe white-worm lacquer peel and check boot floor trim for water ingress around the rear lamp cluster seals
Check a 2018 Kia Soul by Registration