Description
Power steering control unit for Citroën C2 and C3 vehicles.
This electric power steering control unit is a direct-fit solution for Citroën C2 and Citroën C3 models. Designed for workshops and experienced DIYers, the unit restores hydraulic-free steering assistance by managing the electric motor, torque sensor input and safety monitoring. Frequently searched by product codes, this part is essential when the vehicle displays increased steering effort, intermittent assistance or an EPS warning lamp. Clear identification by OEM numbers speeds up ordering and ensures correct replacement.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Citroën C2, Citroën C3, Citroën C3 Pluriel
- Product Codes: 9650836780, 400687, 400688
- Additional Numbers: NFP
Compatibility
Compatible With: Citroën C2, Citroën C3, Citroën C3 Pluriel. Always match the product codes listed above with the unit fitted to the vehicle to confirm interchangeability.
Function And Typical Symptoms
The Control Unit Regulates Electric Power Steering Assistance by processing the Torque Sensor Signal and Driving The Assist Motor. Common Symptoms Of A Faulty Unit Include:
- Increased Or Loss Of Power Steering Assist.
- EPS Or Steering Warning Light On Dashboard.
- Intermittent Or Erratic Assistance, Including Jerky Or Noisy Operation.
- Stored Fault Codes Related To Steering Electronics.
Common Failure Causes
- Water Ingress Or Moisture Causing Connector Corrosion Or Internal Damage.
- Electrical Overvoltage Or Voltage Spikes (Poor Battery/Charging System Condition).
- Connector Oxidation, Loose Contacts Or Damaged Wiring Harness.
- Mechanical Shock Or Impact To The Steering Column Area.
- Age-Related Component Wear And Thermal Stress.
Replacement And Installation Guide
General Steps For Replacement (Summary For Trained Personnel):
- Disconnect The Negative Battery Terminal Before Any Work To Avoid Damage To Electronic Modules.
- Remove Lower Dash And Steering Column Trim To Access The Unit. Keep Fasteners Organized.
- Note Steering Wheel Position Before Disconnecting; Do Not Turn The Steering Wheel With The Unit Disconnected.
- Unplug Electrical Connectors Carefully, Release Any Locking Clips And Remove Mounting Bolts.
- Install The New Unit In Reverse Order, Securing Bolts To Manufacturer Torque Values.
- Reconnect Battery And Perform Required Calibration/Adaptation Of The Steering System With A Diagnostic Tool Supporting Peugeot/Citroën Protocols.
- Verify No Related Fault Codes Remain And Complete A Test Drive To Confirm Normal Operation.
Recommendations For Installation
- Always Disconnect The Battery Before Removal Or Installation To Prevent Module Damage.
- Inspect Connectors And Wiring; Clean Corroded Contacts Or Replace Damaged Harnesses.
- Protect The Unit From Moisture During Installation. Ensure Gaskets And Seals Are Intact.
- Perform Steering Angle Sensor Calibration And Any Required Electronic Adaptations After Replacement Using A Suitable Diagnostic Tool.
- Follow Manufacturer Torque Specifications For Fasteners And Reassemble Trim Securely.
Why This Part Fails Most Often
Failures Are Most Frequently Caused By Environmental Factors (Water And Corrosion), Electrical Issues (Voltage Spikes Or Poor Battery/Alternator Condition) And Connector Problems. Mechanical Impacts To The Steering Column Or Long-Term Thermal Stress Can Also Lead To Malfunction.
