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Hyundai-Kia E-GMP (Ioniq 5, Ioniq 6, EV6) vs MG eléctrico (MG4, ZS EV, Marvel R): which engine is more reliable?

According to our risk index, the MG eléctrico (MG4, ZS EV, Marvel R) carries less risk than the Hyundai-Kia E-GMP (Ioniq 5, Ioniq 6, EV6): 20/100 (low risk) versus 40/100 (moderate risk). The Hyundai-Kia E-GMP (Ioniq 5, Ioniq 6, EV6) has 3 documented serious faults, the main one being «Faulty ICCU: 12 V battery drains, charging fails and power is lost»; the MG eléctrico (MG4, ZS EV, Marvel R) has 1 documented serious fault, the main one being «High-voltage system fault warning and loss of propulsion».

Risk index

Hyundai-Kia E-GMP (Ioniq 5, Ioniq 6, EV6)

40

Moderate risk · 3 serious faults

Risk index

MG eléctrico (MG4, ZS EV, Marvel R)

20

Low risk · 1 serious fault

Lower risk

The index (0–100) weights the severity and frequency of the three most serious documented faults. How it is calculated

20 sourcesHow we work

Is the Hyundai-Kia E-GMP (Ioniq 5, Ioniq 6, EV6) reliable?

The E-GMP platform is reasonably reliable, with one clear caveat: the ICCU (on-board charger and 12 V converter) had campaigns on the Ioniq 5, Ioniq 6 and EV6 up to production in early 2024. Beyond that, the battery keeps high health in measurements and the motor has few documented cases.[1][2][3]

See the 4 of the Hyundai-Kia E-GMP (Ioniq 5, Ioniq 6, EV6) faults

Is the MG eléctrico (MG4, ZS EV, Marvel R) reliable?

MG electric cars have few documented battery or motor faults; the most cited is AC charging, which is sometimes rejected or interrupted. What Car? places the MG4 in the lower part of its survey, mainly for minor electronics.[4][5][6]

See the 2 of the MG eléctrico (MG4, ZS EV, Marvel R) faults

Side-by-side comparison

Comparison of Hyundai-Kia E-GMP (Ioniq 5, Ioniq 6, EV6) and MG eléctrico (MG4, ZS EV, Marvel R)
Hyundai-Kia E-GMP (Ioniq 5, Ioniq 6, EV6)MG eléctrico (MG4, ZS EV, Marvel R)
Technical data
TypeEngineEngine
FuelElectricalElectrical
Displacement——
Timing——
Power151–325 hp143–435 hp
Productionsince 2021[7][8][9]since 2019[10][11][12][13]
Reliability
Risk index (what is it?)40Moderate risk20Low risk
Documented faults42
Of high or critical severity31
Worst severityHigh severityHigh severity
Main faults
  1. High severity: Faulty ICCU: 12 V battery drains, charging fails and power is lost
  2. High severity: Faulty traction battery module or cells
  3. High severity: Whine from the reduction gear or electric motor and bearing wear
  1. Medium severity: Charging faults: on-board charger and interrupted charging
  2. High severity: High-voltage system fault warning and loss of propulsion
Most expensive documented repairup to €5,000Faulty ICCU: 12 V battery drains, charging fails and power is lostPublished figure[1][14]No reliable data
Which versions to buy
BuyRecommended versions
  • Ioniq 5 and EV6 with 84 kWh battery, facelift (2024-present)[1][14]
  • ZS EV Long Range 72.6 kWh, 177 hp (2021-2024)[15]
With cautionVersions to be cautious about
  • Ioniq 5 and EV6 58 kWh, rear-wheel drive, 170 hp (2021-2024)[1][16]
  • Ioniq 5 and EV6 72.6 kWh and 77.4 kWh, rear-wheel drive, 218-229 hp (2021-2024)[1][3][17]
  • Ioniq 5, Ioniq 6 and EV6 77.4 kWh, all-wheel drive, 306-325 hp (2021-2024)[1][18]
  • Ioniq 6 53 kWh, rear-wheel drive, 151 hp (2023-present)[1][9]
  • MG4 Standard Range 51 kWh LFP, 170 hp (2022-present)[5]
  • MG4 Long Range 64 kWh, 204 hp (2022-present)[4]
  • MG4 Extended Range 77 kWh, 245 hp (2023-present)[4][5]
  • MG4 XPower 64 kWh, 435 hp (2023-present)[19]
  • ZS EV 44.5 kWh, 143 hp (2019-2021)[20]
  • ZS EV Standard Range 51 kWh LFP, 150 hp (2022-2024)[15]
  • Marvel R Comfort/Luxury 70 kWh, 180 hp (2021-2024)[6]
  • Marvel R Performance 70 kWh, 288 hp (2021-2024)[6]
AvoidVersions to avoidNoneNone

Severity of each fault: green, low; amber, medium; red, high; dark red, critical. How we rate them

Cars that each one is fitted to

Hyundai-Kia E-GMP (Ioniq 5, Ioniq 6, EV6)

MG eléctrico (MG4, ZS EV, Marvel R)

Other comparisons

With the Hyundai-Kia E-GMP (Ioniq 5, Ioniq 6, EV6)

With the MG eléctrico (MG4, ZS EV, Marvel R)

Compare other engines

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Sources

Every fact on this page links to its source. If you find an error, let us know.

  1. Hyundai Ioniq 5, Ioniq 6: Probleme mit der integrierten Ladeeinheit (ICCU)ÖAMTC · Consumer association · published 30 August 2024 · consulted 30 October 2026 · in German
  2. Batteriegesundheit von E-Gebrauchtwagen schwankt starkelectrive.net · Motoring press · published 2 September 2026 · consulted 30 October 2026 · in German
  3. Tous les problèmes du Kia EV6 2021 (19 témoignages)fiches-auto.fr · Motoring press · consulted 30 October 2026 · in French
  4. Fiabilité Mg MG4 (2023): toutes les pannes connuesFiches-auto.fr · Reliability study · consulted 30 October 2026 · in French
  5. Used MG4 2022-present reliabilityWhat Car? · Reliability study · consulted 30 October 2026
  6. Fiabilité Mg Marvel R (2021): toutes les pannes connuesFiches-auto.fr · Reliability study · consulted 30 October 2026 · in French
  7. Hyundai Ioniq 5Wikipedia · Other source · consulted 30 October 2026
  8. Kia EV6Wikipedia · Other source · consulted 30 October 2026
  9. Hyundai Ioniq 6Wikipedia · Other source · consulted 30 October 2026
  10. MG4 EVWikipedia · Other source · consulted 30 October 2026
  11. MG ZS (crossover): sección MG EZS / ZS EVWikipedia · Other source · consulted 30 October 2026
  12. Datos generales MG MG4 Electric Luxury (05/23 - 07/25)ADAC · Technical documentation · consulted 30 October 2026 · in German
  13. MG Marvel R Electric: motores, equipamiento y preciosCarnovo · Technical documentation · published 21 July 2023 · consulted 30 October 2026 · in Spanish
  14. Hyundai & Kia: ICCU-Kollaps stoppt 67.000 Elektroautosschmidtisblog.de · General press · published 23 October 2026 · consulted 30 October 2026 · in German
  15. Fiabilité Mg ZS: toutes les pannes connuesFiches-auto.fr · Reliability study · consulted 30 October 2026 · in French
  16. Hyundai Ioniq 5: Probleme, Schwachstellen und RückrufeGebrauchtwagenberater.de · Motoring press · consulted 30 October 2026 · in German
  17. Tous les problèmes sur Hyundai Ioniq 5 2021 (47 témoignages)fiches-auto.fr · Motoring press · consulted 30 October 2026 · in French
  18. Hyundai Ioniq 6: problèmes et fiabilité (7 témoignages)fiches-auto.fr · Motoring press · consulted 30 October 2026 · in French
  19. Foro GoingElectric: MG4 XPower con fallo del sistema de control y sin cargaGoingElectric · Owners' forum · consulted 30 October 2026 · in German
  20. Foro MGEVs: batería de tracción de un ZS EV de 2019 averiada con menos de 22.000 millasMGEVs.com · Owners' forum · published 26 August 2025 · consulted 30 October 2026