Description
High-capacity reservoir – Continental START-STOP capacitor for Citroën and Peugeot vehicles
This Continental high-capacity START-STOP capacitor is engineered to support the Start-Stop system on a range of Citroën and Peugeot models. Designed for professional workshops and experienced DIYers, the unit stabilizes voltage during engine-off phases, supplies the energy needed for rapid restarts and reduces strain on the starter and battery. Commonly searched by OEM part numbers, this capacitor is a direct-fit replacement that helps restore reliable Start-Stop operation and smooth electrical performance.
Key Benefits
- Improves Start-Stop reliability by providing an energy reservoir for quick engine restarts.
- Reduces wear on the starter motor and battery by smoothing voltage peaks.
- Direct replacement for affected Citroën and Peugeot models—often located by OEM part number searches.
- High-quality Continental component designed for automotive electrical systems.
Compatibility
Typical applications include, but may not be limited to: Citroën Berlingo (B9), Citroën C4, Citroën C4 Picasso, Citroën Jumpy (JUM), Peugeot 208, Peugeot 308 and Peugeot Partner III. Always confirm the correct OEM part number for your vehicle before ordering.
Technical Information
- Manufacturer: Continental
- Model(s): Citroën Berlingo B9; Citroën C4; Citroën C4 Picasso; Citroën Jumpy; Peugeot 208; Peugeot 308; Peugeot Partner III
- Product Codes: 9677002780; 9801739380; 9852039780
- Additional Numbers: OEM reference numbers used by Stellantis group (see product codes above)
Function And Operation
The Start-Stop capacitor acts as a high-capacity energy reservoir that supports the vehicle’s electrical system during engine-off intervals. It supplies the instantaneous current required for a restart and helps maintain stable voltage for onboard electronics (ECUs, infotainment, climate control) during stops. By buffering transient loads, it reduces stress on the starter and main battery and contributes to smoother, faster restarts.
Replacement Procedure (Overview)
- Park the vehicle on level ground, engage the parking brake and remove any ignition key.
- Disconnect the negative battery terminal and wait a few minutes to allow residual charge to dissipate.
- Locate the capacitor assembly—typically installed near the battery or the main power distribution area; remove trim or covers as required to access the unit.
- Disconnect electrical connectors and any retaining clips or bolts. Note connector positions for correct reassembly.
- Install the new capacitor, secure fasteners to the vehicle manufacturer’s specifications and reconnect electrical connectors.
- Reconnect the battery, start the vehicle and verify Start-Stop function and electrical system stability. Clear any residual fault codes using diagnostic equipment if necessary.
Installation Recommendations
- Always Disconnect The Battery Before Work: To avoid electrical damage and personal injury, remove the negative battery terminal before removing the capacitor.
- Use Proper Tools: Protect connector locking tabs and harnesses when unplugging; avoid excessive force.
- Check For Corrosion And Wiring Damage: Inspect wiring, terminals and grounding points while the unit is removed; repair any issues to prevent repeated failures.
- Verify System Operation With Diagnostic Tool: After installation, confirm Start-Stop readiness and clear any fault codes using a compatible diagnostic scanner.
Why This Part Most Commonly Fails
Failures are usually caused by age-related degradation, thermal stress and electrical overstress. Repeated charge/discharge cycles, exposure to high under-hood temperatures, moisture ingress or sustained overvoltage events can reduce capacitance or increase internal resistance (ESR), which impairs the unit’s ability to deliver the required current for restarts. Corroded connectors and poor grounding are also frequent contributors to malfunction.
Practical Tips For Mechanics
- When diagnosing Start-Stop faults, test both the capacitor and the battery—one weak component can mask the other.
- Document the original part number and compare with the replacement to ensure compatibility.
- Replace related damaged wiring or mounting hardware at the same time to avoid repeat visits.
This component is commonly searched by its OEM numbers 9677002780 and 9801739380; include these references in your parts lookup to speed up identification and ordering.
