Description
Battery State-of-Charge Unit for Citroën and Peugeot Vehicles
The Battery State-of-Charge Unit 9676600080 is a vital electronic module designed for Citroën and Peugeot cars. It continuously monitors battery voltage and state-of-charge, communicates battery condition to vehicle control units and supports charging strategy and start‑stop functionality. This unit is intended for professional workshops and experienced DIY mechanics who service PSA group vehicles and look up parts by product code (9676600080).
Why This Part Matters
A correctly functioning state-of-charge unit ensures reliable engine starts, stable electrical system operation and optimal charging behaviour. When the module reports accurate battery condition, the alternator and energy management systems can adapt charging to prolong battery life and maintain the performance of start‑stop systems.
How It Fails And Service Life
Electronics of this type can last the lifetime of the vehicle but may fail earlier due to environmental or electrical stresses. Typical causes of failure include water ingress or corrosion at connectors, long-term exposure to heat and vibration, voltage spikes from a faulty alternator, poor battery condition or loose wiring. Vehicles with frequent short trips and repeatedly discharged batteries place higher stress on the unit and related components.
How The Part Is Replaced
Replacement is straightforward for a competent mechanic: isolate the vehicle electrically, access the module (location varies by model—often near the battery or under trim panels), disconnect the unit connector(s), remove fasteners, swap units and reassemble. After installation the system should be checked for fault codes and battery charging behaviour. Some vehicles may require initialization or adaptation of the new unit using PSA diagnostic equipment.
Installation Recommendations
- Always disconnect the negative battery terminal before starting work and follow the vehicle manufacturer’s safety procedures.
- Protect connectors from contamination and ensure contacts are clean and dry before reconnection.
- Use correct tools and avoid forcing connectors; secure the unit with the original mounting hardware to prevent vibration damage.
- After installation, clear any diagnostic trouble codes and verify charging system operation. If symptoms persist, perform a full battery and charging system test.
- If initialization or coding is required, use official PSA diagnostic tools (DiagBox/Lexia) or have the procedure performed by a qualified service with appropriate equipment.
Most Common Failure Causes
- Corrosion or water ingress at connectors and terminals.
- Electrical surges from alternator faults or jump-starting incidents.
- Age-related degradation of internal components due to heat and vibration.
- Poor battery health causing increased electrical stress on the monitoring unit.
- Loose or damaged wiring and poor grounding resulting in intermittent faults.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Peugeot 508; Selected Citroën and Peugeot Models
- Product Codes: 9676600080
- Additional Numbers: None Provided
