Description
Protection and Power Management Unit for Peugeot 508 vehicles.
High-quality used power distribution and protection module for Peugeot 508 (OEM Number: 9665878080). This unit controls and protects the vehicle’s main electrical circuits, integrating fuses, relays and electronic power-management functions in a single compact module. Ideal for professional workshops and experienced DIY mechanics looking to restore reliable electrical operation after fusebox faults, water damage or electrical short circuits. Clear OEM identification (9665878080) makes it easy to find the correct replacement part in catalogs and search engines.
Product Overview
The power protection and management module is responsible for distributing battery power to key systems in the engine bay and protecting circuits with integrated fuses and relays. On Peugeot 508 models this module monitors supply lines, controls switching for major consumers and helps prevent damage from overloads or short circuits. Replacing a faulty module typically restores loss of electrical functions such as ignition circuits, lighting, fuel pump supply or engine management auxiliaries.
How To Replace
- Disconnect the negative battery terminal before any work to avoid short circuits and potential damage.
- Locate the module in the engine bay (engine fusebox/BSM area) and remove any protective covers.
- Carefully unplug all electrical connectors, noting the position of each connector and fuse/relay if required.
- Unbolt the module from its mounting points and swap it with the replacement unit.
- Reinstall connectors and mounting bolts, reconnect the battery and check electrical systems for correct operation.
- After replacement, verify all affected circuits (lighting, ignition, fuel pump, dashboard indicators) and clear any stored fault codes with diagnostic equipment if necessary.
Common Symptoms Indicating A Fault
- Intermittent or permanent loss of power to one or more electrical circuits.
- Blown fuses or relays that reoccur shortly after replacement.
- Electrical warnings on the dashboard, unexpected shutdowns, or failure to start.
- Visible corrosion, melted plastic or burn marks on the module or connectors.
Technical Information
- Manufacturer: Stellantis
- Model: Peugeot 508
- Product Codes: 9665878080
- Additional Numbers: N/A
Installation Recommendations
- Always disconnect the battery before removal and installation to prevent short circuits and protect vehicle electronics.
- Inspect connectors and wiring for corrosion or damage; replace or repair faulty wiring to prevent repeat failures.
- Use appropriate tools and follow vehicle manufacturer tightening and removal procedures to avoid damaging the module or mounting points.
- After replacement, run a full check of electrical functions and clear fault codes using diagnostic equipment where available.
- If you are not experienced with vehicle electrical systems, have the replacement performed or checked by a professional workshop.
Why This Part Fails Most Often
The most common causes of failure are moisture ingress and corrosion, thermal stress from overloaded circuits or poor connections, and electrical faults such as short circuits. Water or road-splash can penetrate seals and cause internal damage to connectors and the PCB. Repeated overloads or loose terminals can create heat concentration that degrades contacts and solder joints, leading to intermittent faults or complete failure. Addressing the root cause—repairing damaged wiring, securing connectors and ensuring proper sealing—reduces the chance of recurrence.
Notes For Buyers
This listing refers to a used OEM power protection and management module identified by part number 9665878080 for Peugeot 508. Check the part number match when selecting a replacement. Suitable for mechanics and experienced DIY installers who can follow safe electrical work practices.
