Description
Electric control for the right rear sliding door for Citroën C8 and Peugeot 807.
This electric sliding door control unit (actuator/motor assembly) is designed for the right rear sliding door on Citroën C8 and Peugeot 807 models and is commonly searched under part number 9138Q4. It restores reliable automatic opening and closing, integrates with the vehicle’s electrical system and central locking circuits, and is suitable for professional workshops and experienced DIY mechanics. Ideal when the door moves irregularly, produces grinding noises, does not latch or does not respond to remote/central locking commands.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Citroën C8, Peugeot 807
- Product Codes: 9138Q4
- Other Numbers: 9138Q4 (common reference)
Function And Application
The unit provides powered actuation for the right rear sliding door: it contains the electric motor, gearbox and switch/position feedback components that control door travel and latching. It works together with the sliding door tracks, limit switches and the vehicle’s body wiring to ensure smooth opening/closing and secure locking.
How The Part Is Replaced
Replacement is straightforward for experienced technicians and competent DIYers with basic tools:
- Disconnect the negative battery terminal before starting electrical work.
- Remove the interior trim panels on the sliding door and any access covers to reach the actuator.
- Support the door to prevent sudden movement when the actuator is disconnected.
- Disconnect electrical connectors and remove fasteners securing the actuator/motor assembly.
- Install the new unit, reconnect the electrical plug, refit trim and test full opening/closing and locking functions.
- Check door alignment, lubricate the sliding track and adjust as necessary for smooth operation.
Installation Recommendations
- Always Disconnect The Battery To Avoid Short Circuits Or Unintended Door Movement.
- Use Correct Tools And Keep Fasteners Clean; Replace Any Damaged Clips Or Grommets.
- Support The Door While Removing The Actuator To Prevent Misalignment Or Damage.
- After Installation, Perform Several Full Open/Close Cycles And Confirm Proper Latching And Electrical Integration.
- Apply Suitable Grease To The Sliding Rails And Inspect Drain Holes To Prevent Water Ingress.
Why This Part Commonly Fails
- Water Ingress And Corrosion Of Electrical Connectors Or Internal Gears Leading To Intermittent Or Complete Failure.
- Mechanical Wear Of Gear Teeth Or Internal Mechanisms Caused By Frequent Use, Dirt And Lack Of Lubrication.
- Motor Burnout Due To Overload When Tracks Are Misaligned Or Obstructed.
- Damage From Impacts Or Door Misalignment That Stresses The Actuator.
- Wiring Faults, Blown Fuses Or Poor Grounds In The Vehicle Electrical System.
Maintenance Tips
Keep the sliding track clean and periodically lubricated, inspect door drains and seals to prevent moisture buildup, and check electrical connectors for corrosion. Early attention to unusual noises, slow movement or intermittent operation will typically reduce repair complexity and cost.
Search Tips
Customers and workshops frequently look for this part using the part number 9138Q4 together with model names Citroën C8 or Peugeot 807. Including these terms in searches increases the chance of a fast match.
