Description
Hydroactive suspension controller for Citroën C5 first series. Without SPORT button.
This Hydroactive suspension controller is a direct-fit electronic unit for Citroën C5 first generation vehicles equipped with Hydractive suspension. Ideal for professional workshops and DIY mechanics who search by part number, the unit often appears under codes 9633261277, 9627701677 or 655488. Replacing a faulty controller restores automatic ride height adjustment and damping control, improving comfort and safety on vehicles that show height faults, warning lights or inconsistent ride behaviour.
Key Benefits
- Direct replacement for original Hydractive control units used on Citroën C5 first series.
- Restores automatic height regulation and suspension responsiveness.
- Commonly searched by OE numbers (useful for fast SEO discovery by technicians).
- Suitable for professional fitment or competent DIY installation with basic electrical skills.
How It Works
The controller monitors inputs from height sensors, wheel and vehicle speed sensors and controls hydraulic valves and pumps to adjust vehicle height and damping. When operating normally, it maintains correct ride height for different loads and driving conditions. Failure of the controller can cause incorrect ride height, constant low or high stance, warning lamps on the dashboard or loss of adaptive damping functionality.
Fitment And Compatibility
Fits Citroën C5 First Series models equipped with Hydractive suspension systems. Frequently referenced by part numbers and codes listed below. Confirm fitment by matching part numbers stamped on the original unit or on service documentation before installation.
Technical Information
- Manufacturer: Stellantis (Citroën/Peugeot)
- Model: Citroën C5 First Series (Hydractive Suspension)
- Product Codes: 9633261277, 9627701677, 655488
- Additional Numbers: 6554EV NFP
Installation Recommendations
- Always disconnect the battery before starting work to prevent electrical damage.
- Locate and document connector positions and mounting hardware before removal; transfer any brackets or grommets to the new unit.
- Inspect wiring and connectors for corrosion or damage and clean contacts; poor connections are a common cause of repeat failures.
- After fitting, clear fault codes and verify sensor readings with a diagnostic tool; some repairs require recalibration of height sensors or pump activation checks.
- Use proper torque values for mounting fasteners and protect the unit from water ingress and road debris after installation.
How To Replace (Overview)
- Disconnect negative battery terminal.
- Gain access to the controller (location may vary by model—refer to vehicle repair manual).
- Unplug electrical connectors and remove mounting screws or clips.
- Install replacement unit, reconnect connectors and secure mounting hardware.
- Reconnect battery, clear faults and perform sensor calibration or system checks with a diagnostic tool.
Why The Part Fails Most Often
Electronic controllers for Hydractive systems typically fail due to moisture ingress and connector corrosion, age-related degradation of internal components, or damage from voltage spikes and poor battery connections. Symptoms include persistent suspension warning lights, incorrect ride height, noisy pump operation or loss of adaptive control. Regular inspection of electrical connections and protection from water and salt exposure can extend unit life.
Notes For Mechanics And DIYers
Technicians commonly search by OE numbers; include these codes in quotes during online searches for faster results. If uncertainty remains about fitment, compare the part number on the original unit to the codes listed above before purchase. After installation, use a compatible diagnostic tool to confirm correct operation and to reset any system faults.
