Description

Replacement Hydroactive suspension controller designed for Citroën C5 first generation vehicles. This electronic control unit manages the hydraulic suspension system, processing inputs from height sensors and commanding valves and the hydraulic pump to maintain ride height and comfort. Ideal for professional workshops and experienced DIY mechanics looking for a direct-fit part referenced by original product numbers.

Technical Information

• Manufacturer: Stellantis / Citroën / Peugeot
• Model: Citroën C5 (First Generation)
• Product Codes: 9633261277, 9627701677
• Other Numbers: 655488, 6554EV, NFP

Function And Benefits

The Hydroactive controller interprets signals from suspension height sensors and adjusts hydraulic valves and pump operation to maintain correct vehicle stance, stability and ride comfort. A properly functioning controller ensures consistent leveling during load changes, stable handling during cornering and optimized damping control where applicable. Replacing a faulty unit restores correct communication between sensors and hydraulic actuators, often resolving uneven ride height, warning lights and degraded suspension performance.

How To Replace (High-Level Guide)

• Prepare: Work on a flat surface, use appropriate lifting equipment and safety stands.
• Safety First: Disconnect the vehicle battery before any work on the electrical system to avoid short circuits and protect the unit.
• Access Unit: Locate and access the Hydroactive controller (refer to vehicle repair manual for exact location and removal steps).
• Disconnect: Carefully unplug all electrical connectors and secure wiring harnesses to avoid damage.
• Remove And Replace: Remove mounting fasteners, install the replacement controller, and reattach connectors ensuring good contact.
• Initialization: After installation, perform any required system initialization or sensor calibration using a suitable PSA diagnostic tool to ensure correct height referencing and system function.
• Final Check: Reconnect the battery, verify there are no fault codes, cycle the suspension through its range and perform a road test to confirm correct operation.

Installation Recommendation

Always disconnect the battery before disassembly and follow the vehicle manufacturer’s procedures to avoid damage to the unit. Inspect connectors and wiring for corrosion or mechanical damage and clean or repair as necessary before fitting the new controller. After replacement, calibrate suspension height sensors and clear any stored fault codes with a compatible diagnostic tool. If you are not equipped with PSA diagnostic equipment, consider professional initialization to guarantee full system functionality.

Most Common Failure Reasons

• Water Ingress And Corrosion: Moisture in connectors or unit housing can cause intermittent faults or permanent failure.
• Connector And Wiring Damage: Broken pins, loose connections or chafed wiring lead to signal loss and malfunction.
• Electrical Overstress: Voltage spikes from jump-starts or charging system faults can damage internal electronics.
• Age And Environmental Wear: Long-term exposure to heat, vibration and contaminants degrades seals and electronic components.
• Associated Component Failures: Faulty height sensors, valves or pump issues can overload the controller or mask root causes—always diagnose related components.

Why Choose This Part

Supplied with original reference numbers for straightforward identification, this Hydroactive controller is suitable for technicians who require a direct-fit solution for Citroën C5 first generation vehicles. Clear product codes make it easy to search and match the correct unit, reducing downtime and ensuring a professional repair outcome.

This Hydroactive suspension controller with integrated SPORT button is designed for Citroën C5 models equipped with Hydractive suspension. The unit manages suspension behavior, delivering firmer damping and reduced body roll when SPORT mode is engaged. Ideal for professional workshops and skilled DIY enthusiasts, this controller is often searched by its part numbers (9633261277, 9627701677, 9654308077, 655487, 6554EW) — include these references when locating the correct replacement.

The controller communicates with height sensors, hydraulic valves and the suspension pump to regulate ride height and damping in real time. In SPORT mode it alters control maps to tighten suspension response for improved handling. Typical fitment is on Citroën C5 models equipped with Hydroactive (Hydractive) suspension systems. Replacing the unit restores electronic control over the hydraulic system and the SPORT function when the original module is faulty.

Technical Information

• Manufacturer: Stellantis (Citroën/Peugeot)
• Model: Citroën C5 (vehicles Equipped With Hydroactive Suspension)
• Product Codes: 9633261277, 9627701677
• Additional Numbers: 9654308077, 655487, 6554EW

Key Features & Function

• Electronic control of hydraulic suspension: adjusts damping and ride height according to driving conditions.
• SPORT Button: selects a more aggressive control map for firmer handling and reduced body movement.
• Interfaces With: height sensors, suspension pump, solenoid valves and vehicle CAN bus for coordinated chassis control.

Symptoms Of A Failing Unit

• Loss Of SPORT Mode Functionality Or No Response From The SPORT Button.
• Inconsistent Ride Height, Unresponsive Suspension Or Warning Lights Related To Suspension.
• Intermittent Operation Or Complete Failure Of Automatic Height Control.

Replacement And Installation Guidance

Suitable For Experienced Technicians And Competent DIY Mechanics. Recommended Steps:

1. Secure The Vehicle On Level Ground And Ensure Safe Support Before Work.
2. Disconnect The Battery Before Starting Work To Avoid Electrical Damage Or Short Circuits.
3. Locate The Hydroactive Controller (Location Varies By Model — Often Mounted In Engine Bay Or Behind Interior Panels).
4. Unplug Electrical Connectors Carefully, Note Locking Tabs And Any Seals To Prevent Water Ingress On Reassembly.
5. Remove Fasteners, Extract The Old Unit And Fit The Replacement In Reverse Order.
6. After Mechanical Fitment, Perform Any Required Initialization Or Adaptation — Some Vehicles May Require Diagnostic Tool Procedures To Restore Full Functionality.
7. Verify System Operation: Check Height Control, SPORT Mode, And Perform A Road Test To Confirm Correct Behavior.

Installation Recommendations

• Always Disconnect The Battery Before Removing Or Installing The Unit.
• Protect Connectors From Moisture And Corrosion; Replace Damaged Seals And Check Wiring Harness For Wear.
• Use Appropriate Diagnostic Equipment To Read Fault Codes And Confirm Correct System Initialization After Replacement.
• Follow Manufacturer Service Procedures And Torque Specifications Where Applicable.

Most Common Causes Of Failure

• Water Ingress And Corrosion Around Connectors Or The Module Housing Leading To Electrical Faults.
• Age-Related Electronic Component Degradation Or Thermal Stress Causing Intermittent Or Permanent Failures.
• Damaged Wiring Or Poor Ground Connections Affecting Communication With Sensors And The Pump.
• Voltage Spikes Or Improper Jump-Starting That Can Damage Internal Electronics.

Part numbers and model references are included for reliable searching — enter the listed codes when sourcing the correct Hydroactive controller for Citroën C5. This description targets mechanics and competent DIYers who require clear technical guidance and practical installation advice.