Description
Suspension control unit for Citroën and Peugeot vehicles. It is from a Citroën C4 Picasso.
Overview
This suspension control unit (electronic control module) regulates the vehicle’s suspension system by reading position and acceleration sensors and commanding actuators/valves to adjust ride height and damping. Designed for professionals and experienced DIYers, the unit is commonly sought under original part numbers such as 9665811380, 0X080336, 5273N1, 5273P4 and 5273N2. Replacing the control unit restores correct suspension behaviour, ride comfort and vehicle leveling when the original module fails.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Citroën C4 Picasso
- Product Codes: 9665811380, 0X080336
- Additional Numbers: 5273N1, 5273P4, 5273N2
Compatibility
Unit originates from Citroën C4 Picasso. Identical or similar control units may be used across other Citroën and Peugeot models that share the same electronic suspension architecture; confirm compatibility by matching the product codes listed above. Searching by the OE numbers increases the chance of finding the correct replacement quickly.
Replacement Procedure
Replacement should be performed by a skilled mechanic or an experienced enthusiast with the right tools. Typical steps:
- Park the vehicle on a level surface and secure it. Always follow the vehicle manufacturer’s safety instructions.
- Disconnect the battery before starting to avoid electrical damage to the module and vehicle electronics.
- Raise the vehicle if needed and access the control unit location (consult vehicle repair manual for exact position; often mounted in the engine bay or underbody area protected from debris).
- Remove electrical connectors and mounting fasteners, noting connector positions and orientations.
- Install the replacement unit, secure all fasteners and reconnect connectors ensuring clean, corrosion-free contacts.
- Reconnect the battery and perform any required initialization or system checks as described by the manufacturer.
Installation Recommendations
- Always Disconnect The Battery Before Removing Or Fitting The Unit To Prevent Damage.
- Inspect Connectors And Wiring For Corrosion Or Damage; Clean Contacts If Necessary.
- Use A Service Manual Or Manufacturer Procedures For Access And Torque Values.
- After Installation, Verify Suspension Operation And Error Codes With A Diagnostic Tool; Clear Faults Only After Confirming The Root Cause.
Most Common Failure Causes
Suspension control units typically fail due to moisture ingress and corrosion on connectors, impact or vibration damage, electrical short circuits or power surges, and internal component aging. Fault symptoms include uneven ride height, warning lights related to suspension faults, harsh or soft damping, or loss of automatic leveling. Regular inspection of seals and wiring looms reduces the risk of premature failure.
Who Should Buy
Recommended for professional workshops, independent mechanics and competent DIY owners who can identify parts by OE numbers and perform electrical and mechanical replacement procedures. The presence of OE codes in the description helps quick searching and identification in parts catalogs and search engines.
