Citroën C6 2.2 HDi 173 hp problems
The Citroën C6 used the 2.2 HDi from 2006 to 2010 (2.2 HDi 173). 3 documented faults affect it; the most important is “turbo faults, somewhat more frequent on the sequential twin-turbo versions” (high severity, occasional). Our verdict: “With caution”. It is the safest option among the documented engines of the Citroën C6.
Engine score on this car
6.6 out of 10Acceptable reliability
Only counting the faults that affect the versions and years of the C6. How we calculate it
Overall score for the Citroën C6
6.5 out of 10Acceptable reliability
Engines, gearbox, suspension, brakes, electronics and the rest of the car. See breakdown
2.2 HDi
Safest optionPSA/Ford 2.2 HDi and TDCi (DW12) · Diesel
- In the C6
- 2006–2010[1]
- Name
- 2.2 HDi 173
- Faults that affect it
- 3 · 2 of high or critical severity
Verdict for the version it uses
2.2 HDi 170-175 twin-turbo (DW12 BTED4, 2005-2010)2005–2010 · 170–175 hp · DW12, DW12BTED4, ZSD-422
With cautionThe two-turbo system adds mechanical complexity; fiches-auto records a significant number of turbo cases in the twin-turbo versions, although, according to the same source, it does not amount to a chronic problem.[2][3]
Faults that affect the C6
Only those that affect the versions and years that this car used. The 2.2 HDi has 4 documented faults in total.
- High severityFrequency: OccasionalTurboTurbo faults, somewhat more frequent on the sequential twin-turbo versionsThe 2.2 HDi comes in single-turbo versions (128-156 hp) and twin-turbo versions with two turbochargers in sequence (170 hp and up). Fiches-auto does not consider it a chronic problem, but it does record a significant number of turbo cases across all power outputs, somewhat higher on the twin-turbos.
- High severityFrequency: OccasionalInjectionPiezo injector wear and failureThe 2.2 HDi uses third-generation common-rail injection with piezo injectors at up to 1,800-2,000 bar. Fiches-auto documents injector cases across several power outputs, without it being the most repeated fault, with symptoms of hard starting, jerking or higher fuel consumption.
- Medium severityFrequency: RareClutchDual-mass flywheel wear, less frequent than on other HDi enginesThe 2.2 HDi has a dual-mass flywheel but, unlike smaller HDi engines such as the 1.6 HDi, fiches-auto does not document a chronic problem: very few cases in the tables consulted. Even so, it is a wear part: vibration and knocking are the signs to watch for before buying.
What to check before buying a used Citroën C6 2.2 HDi 173 hp
Each point comes from a documented fault that affects this car. You can tick them off as you inspect it.
If it has the 2.2 HDi (2006–2010)
Other engines and gearboxes of the Citroën C6
Score for each one with the faults that affect this car, from best to worst.
Faults of the Citroën C6 outside the engine
Suspension, brakes, electronics and the rest of the car: they occur with any engine.
- High severityFrequency: OccasionalGearbox and clutchJerking and hydraulic block faults in the Citroën C6 six-speed automatic gearboxAccording to fiches-auto.fr, 23 of 151 C6 owner reports cite six-speed automatic gearbox faults: jerking, hesitation when changing gear and locking in P; one case puts the hydraulic block at around €2,200.
- Medium severityFrequency: OccasionalSuspensionHydractive suspension faults on the Citroën C6: leaks, height sensors and spheresAccording to the fiches-auto.fr owner reports, 16 of 151 C6 owners cite Hydractive suspension problems: leaks, faulty height sensors, incorrect ride height and excessive firmness; repairs of around €350 to €1,090 depending on the case.
- Medium severityFrequency: OccasionalElectrical systemAlternator failure and battery problems on the Citroën C6According to fiches-auto.fr, 12 of 151 C6 owner reports cite alternator failures, with repairs of around €600 to €800, and another 6 talk about battery problems.
- Low severityFrequency: RareBrakesABS sensor failure on the Citroën C6According to fiches-auto.fr, 9 of 151 C6 owner reports cite ABS sensor failures, with repairs of around €400 per case.
Buying a Citroën C6 2.2 HDi 173 hp?
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Frequently asked questions
Is the Citroën C6 2.2 HDi 173 hp reliable?
The Citroën C6 used the 2.2 HDi from 2006 to 2010 (2.2 HDi 173). 3 documented faults affect it; the most important is “turbo faults, somewhat more frequent on the sequential twin-turbo versions” (high severity, occasional). Our verdict: “With caution”. It is the safest option among the documented engines of the Citroën C6.
What faults does the Citroën C6 2.2 HDi 173 hp have?
The documented ones that affect this car are: turbo faults, somewhat more frequent on the sequential twin-turbo versions (high severity), piezo injector wear and failure (high severity) and dual-mass flywheel wear, less frequent than on other HDi engines (medium severity).
Which engine should you choose for the Citroën C6?
None has a «Buy» verdict; the safest option is the 2.2 HDi, with a «With caution» verdict.
Own a Citroën C6 2.2 HDi 173 hp? Tell us what faults you have had and at how many kilometres. Report your fault.
Sources
Every fact on this page links to its source. If you find an error, let us know.
- Citroën C6Wikipedia (español) · Other source · consulted 27 September 2026 · in Spanish
- Essai, avis et fiabilité des 2,2 HDI 204 chevauxFiches-Auto · Motoring press · consulted 27 September 2026 · in French
- Essai, avis et fiabilité des 2,2 HDI 136 chevauxFiches-Auto · Motoring press · consulted 27 September 2026 · in French