Citroën C6 1
Weaknesses, engine ratings and buying advice
204–211 PS
3.0L V6 Benzin
Luxurious V6 cruiser
Legendary!241 PS
3.0L HDi V6 Diesel
6 weaknesses
Stay Away!Engine Overview
The Citroën C6 1 is available with 4 engine variants — from 128 to 241 hp.
The Citroën 2.2L HDi (Diesel, 163–170 PS) has the DW12 (2.2L HDi) — rated: "Be Careful", 6 known weaknesses.
The Citroën 2.7L HDi V6 (Diesel, 204 PS) has the UHN (2.7L HDi V6) — rated: "Stay Away!", 6 known weaknesses.
The Citroën 3.0L HDi V6 (Diesel, 241 PS) has the UHZ (3.0L HDi V6) — rated: "Stay Away!", 6 known weaknesses.
The Citroën 3.0L V6 (Petrol, 211 PS) has the ES9 (3.0L V6) — rated: "Be Careful", 6 known weaknesses.
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Vehicle Weaknesses
| Weakness | Cost | |
|---|---|---|
| Hydropneumatic suspension: spheres and cylinders leaking The Hydractive 3+ suspension on the C6 I fails from around 60,000–80,000 km with leaking spheres and cylinders. The car sinks on one or more corners and the ride becomes hard. Repair is labour-intensive and expensive; Citroën has discontinued spare parts. Symptoms: Vehicle sits unevenly low, suspension fault message, very hard ride, vehicle no longer rises to ride height from 80,000 km | High |
Alternatives
Audi A8 D4
Full-Size (2010–2017)
BMW 5er F10
Full-Size (2010–2017)
Ford Taurus 6th Gen
Full-Size (2010–2019)
Mercedes-Benz CLS C218
Full-Size (2010–2018)
VW Phaeton I-FL
Full-Size (2010–2016)
Porsche Panamera 970
Full-Size (2009–2016)
Known Problems and Issues
A total of 29 weaknesses have been documented for the Citroën C6 1 (2005–2012) — 24 engine-related and 5 vehicle-related. 2 problem engines: UHZ (3.0L HDi V6), UHN (2.7L HDi V6). Typical issues affect Suspension, Electronics, Gearbox, Brakes.
C6 (UHN, 2005–2009) — Stay Away!: Injection system — pump and injector wear, VNT turbocharger — vane blockage and actuator fault, Timing chain stretches, camshaft timing inaccurate. Power: 204 PS.
C6 (DW12, 2006–2012) — Be Careful: Sequential bi-turbo system — wear and failures, FAP/DPF — difficult regeneration, known weak point, Head gasket — cracks at high mileage. Power: 163–170 PS.
C6 (UHZ, 2009–2012) — Stay Away!: Turbocharger — bearing wear in commercial use, Injector seals — leakage under high load, DPF/FAP — blockage in van short-trip operation. Power: 241 PS.
C6 (ES9, 2005–2009) — Be Careful: Timing belt — complex replacement on V6, Pencil coil failure, Camshaft cover oil leak. Power: 211 PS.
What to watch out for with the Citroën C6? See the detailed listing of all engine and vehicle weaknesses in the sections above.
Frequently Asked Questions
What problems and weaknesses does the Citroën C6 1 have? +
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Last updated: February 2026 · All information without guarantee