Peugeot 308 Alternator: Specs, Fitment & Common Faults

On the 308, a whining noise that gets louder under load is often the alternator's clutch pulley seizing, not the alternator itself failing — worth confirming before a costly replacement.

Illustration for editorial purposes

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OEM Part Number: 9666997980

Genuinely distinctive to know: this alternator reference is shared not just across the wider Peugeot/Citroen range but also, from the era PSA supplied engines to BMW, the Mini Cooper S — an unexpected cross-manufacturer link worth knowing if you're cross-shopping parts availability.

150 Amp, Valeo, shared across 1.6-litre petrol/HDi diesel range	Genuine cross-reference: 9666997980 (also referenced as FG15T072, TG15T072) — fits Peugeot 208/308/3008/5008, Citroen C3/C4, and Mini Cooper S of the relevant era
Other engine sizes/higher trims	A genuinely different, typically higher-amperage alternator reference applies to other engine sizes and higher-spec trims across this shared PSA Group platform — confirm your exact engine code before ordering

A Genuine, Well-Documented Cause Worth Checking First: The Clutch Pulley — Peugeot 308 Alternator

A well-documented, genuinely useful thing to check before assuming the alternator itself has failed: a groaning or whining noise from the belt area, particularly noticeable as engine revs rise, is very often the alternator's clutch pulley seizing up rather than the alternator's internal charging components failing. One documented case describes exactly this pattern — a loud whine assumed to be a cambelt or water pump issue, which disappeared entirely once the drive belt was removed, confirming the noise was coming from something belt-driven rather than the engine internals. Removing the belt and turning the pulley by hand in both directions is a genuinely useful test: it should lock solid in the normal drive direction and spin freely the other way — if it doesn't behave this way, the clutch pulley has failed rather than anything inside the alternator.

Worth knowing if you have a persistent charging fault rather than a noise: Peugeot's "smart" alternators are controlled by the engine ECU via a LIN-bus signal wire rather than charging at a fixed voltage, and a software-related recall (reference HNZ) has been confirmed on related models for exactly this kind of charging disruption. If disconnecting the alternator's signal connector restores normal charging, this points toward a software or ECU communication fault rather than the alternator itself — worth checking before authorising an expensive replacement.

Peugeot 308 Alternator: Often Blamed on the Battery Instead

On the Peugeot 308, a failing alternator and a simply weak battery share almost the same symptom set at first: dim lights, sluggish starts, charge that won't hold. Mixing the two up is common, which is why plenty of people replace the battery only to find themselves back at the garage shortly after.

Before you buy: alternator output rating varies by engine size and trim, particularly on cars with more onboard electronics. Always confirm against your VIN before ordering.

Peugeot 308 Alternator: What It Does

The Peugeot 308's electrical systems and battery charging both depend on the alternator generating electricity whenever the engine runs. If it's healthy, the battery's job shrinks down to starting the engine and handling brief surges in demand, not powering everything else on its own.

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Peugeot 308 Alternator: Warning Signs, DIY Difficulty & Aftermarket Advice

These are the same regardless of make or model — see our full Alternator Guide for symptoms to watch for (plus a genuinely useful two-minute test to confirm it's not the battery instead), confirming the right amperage and fitment against your VIN, and which brands are worth trusting.

More Peugeot Alternator

The same part, covered across other Peugeot models.