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Dualogic vs 7G-DCT: which gearbox is more reliable?

According to our risk index, the Dualogic gearbox carries less risk than the 7G-DCT gearbox: 29/100 versus 36/100 (both moderate risk). The Dualogic gearbox has 1 documented serious fault, the main one being «Actuator or hydraulic pressure fault: the gearbox drops into neutral on its own or refuses gears»; the 7G-DCT gearbox has 2 documented serious faults, the main one being «Incorrect oil level in the 7G-DCT: December 2020 campaign».

Risk index

Dualogic

29

Moderate risk · 1 serious fault

Lower risk

Risk index

7G-DCT

36

Moderate risk · 2 serious faults

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

12 sourcesHow we work

Is the Dualogic gearbox reliable?

The Dualogic is the automated manual gearbox that Fiat has fitted since 2003 to models such as the 500, Panda, Grande Punto/Punto, Doblò and Qubo, and that Lancia sells as D.F.N. on the Ypsilon. It has no systemic fault acknowledged by the manufacturer, but there are recurring testimonies of jerking on every gearchange, clutches that wear out early, and actuator faults that make the gearbox drop into neutral on its own while driving.[1][2][3]

See the 2 of the Dualogic gearbox faults

Is the 7G-DCT gearbox reliable?

The 7G-DCT is Mercedes-Benz's first dual-clutch gearbox: it has been fitted since 2012 to the A-Class (W176), B-Class (W246), CLA (C117) and GLA (X156); since 2018 its 8-speed evolution, the 8G-DCT, has been used in the second generation of those models (W177, W247, C118, H247). Owners report jerks when cold, clutch wear and, in a few cases, electronic faults with limp mode; there was a service campaign over an incorrect oil level on 2018-2020 units.[4][5][6][7]

See the 5 of the 7G-DCT gearbox faults

Side-by-side comparison

Comparison of Dualogic and 7G-DCT
Dualogic7G-DCT
Technical data
TypeGearboxGearbox
Gearbox type5-speed automated manual (AMT), single dry clutch, electrohydraulic actuation of the clutch and gear selectionDual-clutch, 7-speed (7G-DCT) or 8-speed (8G-DCT)
Productionsince 2003[1][8][9]since 2012[4][5]
Reliability
Risk index (what is it?)29Moderate risk36Moderate risk
Documented faults25
Of high or critical severity12
Worst severityHigh severityHigh severity
Main faults
  1. High severity: Actuator or hydraulic pressure fault: the gearbox drops into neutral on its own or refuses gears
  2. Medium severity: Premature wear or breakage of the Dualogic clutch
  1. High severity: Incorrect oil level in the 7G-DCT: December 2020 campaign
  2. High severity: Mechatronics or control unit failure: limp mode and loss of gears
  3. Medium severity: Jerks and hesitation when pulling away or manoeuvring at low speed
Most expensive documented repairNo reliable dataNo reliable data
Which versions to buy
BuyRecommended versionsNoneNone
With cautionVersions to be cautious about
  • Dualogic 5-speed (2003-present)[2][3]
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

Dualogic

See the 9 models with the Dualogic gearbox

7G-DCT

See the 8 models with the 7G-DCT gearbox

Other comparisons

With the Dualogic gearbox

With the 7G-DCT gearbox

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Sources

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

  1. DualogicWikipedia (español) · Other source · consulted 27 September 2026 · in Spanish
  2. Fiabilité et pannes de la Fiat 500Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  3. Fiat 500 (ab 2007) – alle bekannten Probleme & KrankheitenGebrauchtwagenberater.de · Motoring press · published 24 November 2023 · consulted 27 September 2026 · in German
  4. Mercedes-Benz A-Class (W176)Wikipedia · Other source · consulted 27 September 2026
  5. Mercedes-Benz A-Class (W177)Wikipedia · Other source · consulted 27 September 2026
  6. Fiabilité Mercedes Classe A (2018) - pannesFiches-auto.fr · Technical documentation · consulted 27 September 2026 · in French
  7. Mercedes A-Klasse W177 – Typische Probleme & SchwachstellenGebrauchtwagenberater.de · Motoring press · published April 2023 · consulted 27 September 2026 · in German
  8. SelespeedWikipedia (inglés) · Other source · consulted 27 September 2026
  9. Lancia YpsilonWikipedia (inglés) · Other source · consulted 27 September 2026
  10. Fiabilité Mercedes Classe A (2012-2017) - pannesFiches-auto.fr · Technical documentation · consulted 27 September 2026 · in French
  11. Fiabilité Mercedes CLA (2013-2019) - pannesFiches-auto.fr · Technical documentation · consulted 27 September 2026 · in French
  12. Fiabilité Mercedes GLA (2013-2019) - pannesFiches-auto.fr · Technical documentation · consulted 27 September 2026 · in French