High-quality replacement fuse/power distribution module designed for Citroën and Peugeot models with Start‑Stop functionality. This battery-fed protection unit (BSM-type application) safeguards the electrical feed to steering-related circuits and other downstream consumers, helping to prevent overloads and ensure reliable Start‑Stop operation. Commonly searched by part numbers 9666527680, 28217166 or 6500GR, this unit is suitable for professional workshops and experienced DIY mechanics who need a direct-fit, OEM-compatible component.

Technical Information

• Manufacturer: Stellantis / Citroën Peugeot (OEM)
• Model: Citroën C4; Citroën C4 II; Citroën C4 Picasso; Peugeot 3008 I; Peugeot 308; Peugeot 5008 I
• Product Codes: 9666527680; 28217166; 6500GR
• Additional Numbers: 28236841 (cross reference)

Function And Application

This module acts as a power distribution and protection point for circuits supplied directly from the vehicle battery, with particular attention to steering assistance and Start‑Stop related loads. It contains fuse and relay interfaces and monitoring points that disconnect or protect circuits in the event of overload, short circuit, or abnormal voltage conditions. Correct operation helps maintain steering assist availability and protects sensitive electronics during frequent Start‑Stop cycling.

Replacement Procedure

1. Park the vehicle on a level surface, engage the parking brake and switch off all electrical loads.
2. Disconnect the negative battery terminal and wait a few minutes to allow capacitors to discharge.
3. Locate the BSM/fuse module in the engine bay (consult vehicle-specific manual for exact position).
4. Carefully unplug electrical connectors and release retaining clips or bolts securing the module.
5. Remove the old unit and fit the replacement, ensuring correct orientation and clean connector pins.
6. Reconnect connectors, secure the module, reconnect the battery and perform functional checks (ignition on, Start‑Stop function and steering assist verification).
7. Clear any fault codes if present and re-check after a short test drive.

Installation Recommendations

• Always disconnect the battery before starting work to avoid short circuits and ECU damage.
• Inspect connector pins for corrosion or damage and clean contact surfaces before assembly.
• Use correct torque for mounting bolts and ensure seals/gaskets are intact to prevent water ingress.
• After installation, perform a full electrical system check and monitor Start‑Stop and steering assist behavior.
• If fault codes persist, diagnose wiring and related sensors/actuators before replacing the unit again.

Common Failure Causes

• Water Ingress And Corrosion: Exposure to moisture leads to connector corrosion and internal failures.
• Thermal Stress And Aging: Repeated high-current events and heat cycles degrade internal components over time.
• Electrical Overload Or Short Circuit: Faulty downstream wiring or components can cause overload and damage the module.
• Poor Ground Or Loose Connections: Increased resistance causes heating and intermittent faults affecting Start‑Stop and steering supply.
• High Cycling From Start‑Stop Systems: Frequent engagement increases wear on protective elements and relays.

Notes For Professionals And DIY Mechanics

This unit is intended for vehicles originally equipped with a BSM-type power/fuse module and is often referenced by the part numbers above. Suitable workshop tools and diagnostic equipment are recommended for final checks. Replacing this module typically restores reliable power distribution when failures are caused by internal damage, corrosion or blown protection elements.

Description

This fuse/protection module controls and protects the battery feed to the electric power steering system on a range of Citroën and Peugeot models. Ideal for professional workshops and experienced DIY mechanics, this unit is often searched and ordered by its part numbers (e.g. 9666527580, 28236841, 6500GQ). The module prevents overloads and short circuits on the steering power supply, ensuring reliable assistance and protecting downstream wiring and components.

Key Benefits

• Direct replacement for original Stellantis parts: restores proper power supply protection to the electric steering circuit.
• Saves diagnostic time when replacing a faulty fuse module that causes intermittent or total loss of power steering assistance.
• Designed for fast installation in workshop environments, reducing vehicle downtime.

How It Works

The module monitors and protects the main battery feed to the electric power steering motor and associated relays/fuses. On electrical faults such as short circuits, thermal overload or high current draw, the module interrupts the feed to prevent damage. Proper function is crucial for safe steering assistance and stable vehicle behavior.

Installation Recommendation

Recommended For: Professional Mechanics And Competent DIYers.

1. Always disconnect the negative battery terminal before starting work to avoid short circuits and prevent damage to electronic modules.
2. Locate the fuse/protection module—typically mounted in the engine bay power distribution/junction box near the battery or on the inner wing. Remove any protective covers.
3. Label and disconnect electrical connectors and any linked fuses/relays. Use appropriate trim tools to avoid damaging locking tabs.
4. Remove mounting screws or clips, extract the faulty module and replace with the new unit. Ensure mating surfaces are clean and connectors fully seat until the locking tabs engage.
5. Reinstall covers, reconnect the battery and perform a basic check: ignition on, verify power steering assist operation and absence of warning lamps. If faults persist, check for wiring shorts or blown fuses before replacing additional components.
6. Use a multimeter to verify battery feed and ground continuity if symptoms continue. Follow manufacturer torque and reassembly specs where available.

Why This Part Fails Most Often

Common causes of failure include water ingress and corrosion of connector pins, thermal stress from high current events, vibration fatigue of solder joints or internal components, and damage from previous electrical faults (overcurrent or shorts). Poor battery condition or alternator issues that cause voltage spikes can also shorten the module’s life. Symptoms of failure typically include intermittent or total loss of power steering assistance, blown fuses related to the steering circuit, and steering warning lights on the dash.

Typical Service Life

There is no fixed interval for replacement; expected life depends on vehicle use, environmental exposure and the electrical system condition. Modules on vehicles exposed to moisture, salt or frequent short-power events tend to fail earlier. Inspect connectors and harness insulation during regular service intervals to detect early corrosion or damage.

Technical Information

• Manufacturer: Stellantis
• Model: Citroën C4; Citroën C4 II; Citroën C4 Picasso; Peugeot 3008 I; Peugeot 308; Peugeot 5008 I
• Product Codes: 9666527580, 28236841, 6500GQ
• Other Numbers: 6500.GQ, 28236841

Notes For Installation And Diagnostics

When replacing this module, also inspect the related fuses, wiring harness and steering motor connector for signs of overheating or damage. If a short or repeated fuse blowing is present, locate and repair the underlying fault before installing a new module. After replacement, verify correct operation of the power steering under several driving conditions and re-check for stored fault codes with a diagnostic tool.

Suitable For Professionals And Experienced Enthusiasts

This part is intended for workshops and skilled DIY mechanics who have experience with vehicle electrical systems and safety procedures. Because the unit manages high-current circuits, adhere to safe working practices and use proper tools when diagnosing and replacing the module.

Power steering systems are critical for vehicle maneuverability, allowing drivers to steer with minimal effort. The module protects the power steering system by regulating battery power, preventing potential malfunctions that could lead to steering difficulties. Commonly, power steering modules can experience wear and tear due to voltage fluctuations, making timely replacements essential for maintaining vehicle performance.

When it comes to replacement, the installation of this module is straightforward, making it suitable for both professional mechanics and DIY enthusiasts. Regular inspections of the power steering module are recommended to avoid unforeseen issues that could hinder vehicle operation.

Technical Information

• Manufacturer: PSA
• Model: Citroën Peugeot
• Product Codes: 28236841
• Other Numbers: 6500GQ