Citroën Electrical Diagnostics
Citroën shares Peugeot's PSA/Stellantis architecture — BSI body control, BSM engine fuse box, COM2000 steering column, and Diagbox diagnostics. The same BSI body/network, COM2000 airbag and key/immobiliser fault patterns apply across the Citroën range, including the DS line on earlier platforms.
Citroën Control Modules & Electronics
Key modules and electronic systems used across Citroën vehicles. Correct identification of the module is the first step in proper diagnosis.
BSI — Body Control Unit
Central body electronics.
BSM — Engine Fuse Box
Power distribution.
COM2000
Steering-column communication; airbag clock-spring.
Engine ECU
Engine management.
ABS / ESP
Stability control.
Common Citroën Electrical Faults
Faults we frequently see on Citroën vehicles. Each links to a detailed, all-makes guide covering symptoms, causes and our diagnostic approach.
Body Control Module (BCM) Faults
Central body electronics controlling locking, lighting, wipers and comfort.
READ GUIDEKey Not Detected
Vehicle doesn't recognise the key — won't start or unlock.
READ GUIDEABS Warning Light
ABS warning on — stability and braking-system fault.
READ GUIDEBattery Warning Light & Vehicle Not Charging
Charging-system fault — battery warning or vehicle not charging.
READ GUIDEParking Assist Unavailable
Parking sensors or park assist not working.
READ GUIDEAirbag / SRS Warning Light
Airbag or SRS warning light on — restraint-system fault.
READ GUIDEElectric Power Steering Fault
EPS warning — steering assistance reduced or unavailable.
READ GUIDEAir Suspension Faults
Air-suspension warning — ride-height or compressor fault.
READ GUIDECAN Bus / Network Communication Faults
Network communication fault affecting multiple modules.
READ GUIDECitroën Models We Cover
Citroën Electrical Fault?.
Tell us about your Citroën, the symptoms and any warning messages. OBD_PAL diagnoses the complete system before recommending any repair — don't guess, diagnose it properly.