Quick Facts — Hyundai Ioniq (MK1)

Est. On UK Roads
40,000+
Years Made
2016–2022
Common Engines
1.6 GDi Hybrid, 1.6 GDi PHEV, 28 kWh EV, 38.3 kWh EV

6 Most Common Hyundai Ioniq (MK1) Problems

These are the faults most frequently seen on the Hyundai Ioniq (MK1) by UK garages — ranked by how commonly they occur and what they cost to fix.

1
Hybrid Battery Degradation (Hybrid/PHEV)
High Priority
MK1 Ioniq hybrid and PHEV batteries are showing degradation on older examples — reduced EV range and lower fuel economy.
💷 Typical repair cost: £800–£3,500
2
DCT Gearbox Judder (Hybrid)
Watch
The 6-speed wet DCT in the hybrid Ioniq can develop judder at low speeds. Software updates from Hyundai often resolve it.
💷 Typical repair cost: £0–£1,500
3
EV Battery Range Loss (28 kWh)
Watch
The original 28 kWh battery in the Ioniq Electric is now showing significant range reduction on older examples — real-world range well below the original 174-mile claimed figure.
💷 Typical repair cost: £1,500–£4,000
4
12V Auxiliary Battery Failure
Watch
The 12V auxiliary battery fails every 3–5 years on all Ioniq variants — causing random electrical faults and failure to start.
💷 Typical repair cost: £100–£220
5
Charging Port Latch (EV)
Low Priority
The charging port latch can fail to release or lock correctly on some Ioniq Electric examples.
💷 Typical repair cost: £100–£300
6
Rear Brake Squeal
Low Priority
Rear brake squeal after periods of inactivity is common on Ioniq models.
💷 Typical repair cost: £0–£300

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Hyundai Ioniq (MK1) — MOT Tips

Hybrid and EV warning lights must be clear for MOT. 12V auxiliary battery health should be verified. Check charging port operation on EV models. Hybrid battery health significantly affects the car's value and reliability.

Engine management light on before your MOT? It's an automatic fail. Run a MotorLoom diagnostic for £1.99 to get the likely cause and repair cost before booking the test.

Hyundai Ioniq (MK1) Tyres

Most Hyundai Ioniq (MK1) models run 195/65 R15 or 205/55 R16 depending on trim level and year. Always check the placard inside the driver's door for the exact size for your vehicle.

Summary

The original Ioniq is an efficient and practical used buy. Hybrid battery health on older examples is the most important check. The EV variant's 28 kWh battery is now ageing — real-world range should be tested before buying.

If your Hyundai Ioniq (MK1) has a warning light on or a symptom you can't identify, a MotorLoom diagnostic report for £1.99 gives you likely fault causes, UK repair cost estimates and MOT risk — instantly.

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