Description
Supply Cable For The START-STOP Capacitor For E-HDi Engines.
High-quality replacement cable for the Start‑Stop capacitor used on E‑HDi / 1.6 HDi electrified powertrains. This part is commonly referenced by OE code 9688166780 and fits Citroën and Peugeot vehicles equipped with the Start‑Stop system. Built for workshops and experienced DIY mechanics, the cable restores reliable power delivery to the Start‑Stop capacitor and helps eliminate intermittent Start‑Stop faults.
Technical Information
- Manufacturer: Stellantis (Citroën, Peugeot)
- Model: Peugeot 508; Citroën C5 X7 (vehicles With E-HDi / 1.6 HDi Start‑Stop System)
- Product Codes: 9688166780
- Additional Numbers: Compatible With E-HDi / 1.6 HDi Start‑Stop Applications
Function And Application
The cable provides the electrical connection between the vehicle wiring harness and the Start‑Stop capacitor (energy storage module). It carries high current pulses during engine stop/start events and must ensure low resistance contact, secure crimping, and correct routing to avoid mechanical damage. Proper operation is essential for smooth Start‑Stop performance and for stable voltage supply during engine restart cycles.
How To Replace
- Disconnect The Battery Before Any Work To Prevent Short Circuits And Protect Electronic Modules.
- Locate The Start‑Stop Capacitor — Typically Positioned Near The Battery Or In The Engine Bay/Trunk Area Depending On Model.
- Remove Any Protective Covers Or Fixings To Access The Cable Terminals.
- Label Or Photograph Connector Positions If Needed, Then Unplug The Connector And Undo Any Fasteners/Clips Holding The Cable.
- Fit The New Cable Ensuring Correct Terminal Orientation, Secure Crimps And Proper Routing Away From Heat Sources And Moving Parts.
- Tighten Connections To The Manufacturer’s Torque Values, Refit Covers, Reconnect The Battery And Verify Start‑Stop Functionality.
Installation Recommendations
- Always Disconnect The Battery Before Starting Work And Follow The Vehicle Manufacturer’s Procedures.
- Check Terminal Faces For Corrosion And Clean Contact Surfaces Prior To Reassembly.
- Secure The Cable With Original Clips Or Equivalent Fasteners To Prevent Rubbing And Chafing.
- After Installation, Perform Electrical Checks: Measure Voltage Drop Under Cranking/Start‑Stop Conditions And Confirm Proper Operation Of The Start‑Stop System.
- Use Appropriate Personal Protective Equipment When Working With High‑Current Connections.
Why The Part Typically Fails
- Corrosion At Terminals Caused By Moisture Ingress Or Poor Sealing.
- Mechanical Damage From Chafing, Vibration Or Incorrect Routing.
- Overheating Or Insulation Breakdown Due To High Current Pulses Or Proximity To Exhaust/Hot Components.
- Bad Crimps Or Loose Connectors Leading To Increased Resistance, Heating And Intermittent Faults.
- Rodent Damage Or External Impact In Some Cases.
If the vehicle Exhibits Start‑Stop Warnings, Loss Of Stop/Start Function Or Intermittent Electrical Faults, Inspect This Cable And The Capacitor Connections As Part Of The Diagnostic Routine.
