Description
Electric power steering pump for Citroën C4 Picasso and Grand Picasso first generation
High-quality electric power steering pump designed for first-generation Citroën C4 Picasso and Grand C4 Picasso models. This unit restores precise steering assist, reduces steering effort at low speeds and eliminates intermittent assist loss caused by a failing pump. Frequently searched under the part codes 9684252580 and 4007WK, this pump is suitable for professional workshops and experienced DIY mechanics working on PSA group vehicles.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Citroën C4 Picasso, Grand C4 Picasso (First Generation)
- Product Codes: 9684252580, 4007WK
- Other Numbers: PSA Original Equipment References (use part codes above for lookup)
Function And Symptoms
The electric power steering pump provides hydraulic pressure for the steering system when the vehicle requires assist, especially at low speeds or when parking. Typical symptoms of a failing pump include unusual whining or grinding noises from the front of the vehicle, increased steering effort, intermittent or complete loss of power assist, and sometimes fault codes logged in the vehicle’s onboard diagnostics. Identifying the correct part number (e.g. 9684252580 / 4007WK) helps ensure direct fit and proper function.
Replacement And Installation
General replacement steps (overview for experienced technicians and competent DIYers):
- Disconnect the vehicle battery before starting work to prevent electrical damage and ensure safety.
- Raise and secure the vehicle; remove protective undertrays or splash guards to access the pump area.
- Carefully capture and drain any power steering fluid to prevent contamination and spills.
- Disconnect the electrical connector and hydraulic lines; cap lines to avoid ingress of dirt.
- Unbolt the pump assembly from its mounting, fit the replacement unit, and tighten fasteners to manufacturer torque where specified.
- Refill the system with manufacturer-specified fluid and bleed the steering system according to the workshop manual (turn wheel lock-to-lock while monitoring fluid level and air removal procedures).
- Clear any related fault codes with diagnostic equipment and perform a road test to confirm restored assist and absence of leaks or noise.
Use OEM-spec seals and fluid, and always follow the vehicle manufacturer’s service manual for exact procedures. If unsure, have the replacement performed by a qualified technician with appropriate tools.
Installation Recommendations
- Always use the manufacturer-recommended power steering fluid; incorrect fluids can damage seals and pump internals.
- Prevent contamination: keep hydraulic connections clean and use caps/plugs when lines are open.
- After installation, check for leaks, correct fluid level, and ensure electrical connectors are securely seated.
- Scan for stored trouble codes after fitting and perform a test drive including slow-speed maneuvers to verify proper assist.
Why This Part Typically Fails
Failures are most often caused by hydraulic contamination, degraded seals, bearing or motor wear, or overheating. Contaminated or degraded power steering fluid accelerates internal wear and can clog valves or damage the pump motor. Electrical faults such as connector corrosion or internal motor failure also occur, especially on high-mileage or age-exposed vehicles. Regular maintenance of the steering system and timely fluid replacement (per manufacturer intervals) reduce the risk of premature failure.
Who Should Buy This Part
Recommended for professional mechanics and experienced DIYers performing repairs on first-generation Citroën C4 Picasso and Grand C4 Picasso models. Ideal when replacing a failed pump or restoring steering performance after symptom diagnosis. Always confirm the part number (9684252580 / 4007WK) matches the vehicle application before installation.
