Description
Power steering control unit for Citroën C2 and C3 vehicles
This power steering control unit (steering ECU/EPS unit) is designed as a direct-fit replacement for Citroën C2 and C3 models. It restores correct electric power steering operation, eliminates erratic assistance and warning lights related to the steering system, and is frequently sought under the part numbers 9650836780, 400687 and 400688. The unit is intended for professional workshops and experienced DIY mechanics who service Stellantis Group vehicles and who search by OEM codes to find the correct spare part quickly.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Citroën C2, Citroën C3, Citroën C3 Pluriel
- Product Codes: 9650836780; 400687; 400688
- Additional Numbers: NFP (as referenced in supplier listing)
Compatibility And Application
Fits Steering Systems On Citroën C2 And Citroën C3 Variants, Including Some C3 Pluriel Versions. Many Customers Locate This Part By Entering The OE Numbers 9650836780, 400687 Or 400688 In Search Engines Or Parts Catalogs.
Installation Recommendations
- Disconnect The Battery Before Starting Work To Avoid Electrical Damage Or Airbag System Warnings.
- Secure The Steering Wheel In The Straight‑Ahead Position And Note Any Alignment Marks Before Disassembly.
- Remove Necessary Trim And Access Panels To Reach The Steering Column And Steering Rack Area; Unplug Electrical Connectors Carefully And Inspect For Corrosion Or Bent Pins.
- Replace The Unit Using The Correct Fasteners; Follow Manufacturer Torque Specifications Where Available.
- After Installation, Reconnect The Battery And Use A Diagnostic Tool To Clear Fault Codes And Perform Steering Angle / EPS Initialization Or Calibration As Required.
- Perform A Road Test To Verify Smooth, Consistent Assistance And To Confirm No Warning Lights Reappear.
Most Common Failure Causes
Electric Power Steering Control Units Typically Fail Due To Electrical Or Environmental Factors Rather Than Simple Wear. The Most Frequent Causes Include:
- Water Ingress And Corrosion Around Connectors Or Internal Electronics Leading To Intermittent Or Permanent Faults.
- Poor Grounding Or Voltage Spikes From A Weak Battery Or Alternator That Damage Electronic Components.
- Failure Of The Torque Sensor Or Drive Motor Inside The Unit Causing Loss Of Assistance Or Erratic Behavior.
- Damaged Wiring Harness Or Connector Pins Due To Mechanical Stress Or Previous Repairs.
- Heat Cycling And Ageing Of Electronic Components Over Time.
Typical Symptoms Include Steering Assistance Warning Light, Heavy Or Intermittent Steering, Unusual Noises From The Steering Column Area, And Stored EPS‑Related Diagnostic Trouble Codes.
This control unit Provides A Practical Replacement Option For Restoring Proper Steering Assistance In Affected Citroën Models. When Searching For The Correct Part, Use The OEM Numbers 9650836780, 400687 Or 400688 To Ensure Compatibility With The Vehicle’s Steering System.
