KNOWN FAULTS · Citroën

Citroën C4 (III) / ë-C4 1.2 PureTech common problems.

2020–2026 · Petrol

Sources are not verified in real time and no entry confirms that your car is affected.

3 known faults with sources

Oil-bath timing belt degradationTiming / lubrication

Engine / equipment: 1.0 / 1.2 PureTech (EB2) in the Peugeot 208/2008/308/3008/5008, Citroën C3/C4/C5 Aircross, DS 3, Opel Corsa/Crossland/Grandland
Period mentioned: 2012 – approx. 2022
Symptoms: Oil pressure warning, hard brake pedal or reduced assistance, oil consumption, blue smoke, squeal at the front of the engine, turbo whistles or loses power.
Possible cause described: The timing belt runs in oil and degrades (especially with short trips and fuel dilution). Debris clogs the oil pump strainer, the brake vacuum pump filter, the turbo oil feed and the variable valve timing solenoids. Stellantis announced compensation for affected owners in 2025.
Check for the garage: Measure the belt through the oil filler opening with the manufacturer's tool. Confirm whether the vacuum pump campaign was done.
Cost cited in the source: Vacuum pump: €500–800; belt with oil system cleaning: considerably moreA rough figure from the original database, not an up-to-date quote.

Applies if: Only if fitted with the automatic gearbox described in the record.

EAT6/EAT8 jerking and torque converterAutomatic gearbox

Engine / equipment: Aisin EAT6 and EAT8 automatic gearboxes (308, 3008, 5008, 508, 2008, C4 Picasso, C5 Aircross, C4, DS 7, Grandland…)
Period mentioned: 2013–2026
Symptoms: Hesitation or a jolt between 1st and 2nd, torque converter shudder in traffic, harsh or delayed shifts and a gearbox fault warning, especially on 2017–2019 3008s.
Possible cause described: Torque converter wear or drift, valve deposits from degraded oil and software faults. Peugeot treats the oil as lifetime, but dirty or low oil causes harsh shifts.
Check for the garage: Check oil level and condition, update the gearbox software at the dealer and, after an oil change, record it with DiagBox and reset the adaptations.
Cost cited in the source: Oil change and update: the most common fix; torque converter or valve body: specialist garage repairA rough figure from the original database, not an up-to-date quote.

Applies if: Only the 1.2 Hybrid 48 V built from 4/10/2023 to 13/1/2026.

Water ingress in the 1.2 Hybrid 48 V belt starter-generatorElectrical and electronic systems

Engine / equipment: 1.2 Hybrid 48 V: Peugeot 208 and 2008, Citroën C3, C3 Aircross, C4 and C4 X, DS 3, Opel Corsa, Frontera and Mokka, Jeep Avenger, Alfa Romeo Junior, Fiat 600 and Grande Panda, Lancia Ypsilon
Period mentioned: 2023 onwards
Symptoms: Engine or electrical-fault warning light, a hot or burning smell under the bonnet and, in extreme cases, an engine-bay fire.
Possible cause described: There is too little clearance between the petrol particulate filter duct and the 48 V hybrid system’s guard (belt starter-generator): in humid conditions water can get in, an electric arc can form and it can overheat. Stellantis recalled about 700,000 cars worldwide (36 incidents, 12 with fire) and advises against pressure-washing the engine until the repair.
Check for the garage: Check the recall by VIN; do not pressure-wash the engine; with the warning or a burning smell, stop and park outdoors.
Cost cited in the source: Free under the recall.A rough figure from the original database, not an up-to-date quote.