Peugeot Electrical Diagnostics
Peugeot uses PSA/Stellantis electronics built around the BSI (Boîte de Servitude Intelligent — the body control unit) and the BSM (Boîte de Sécurité Motorisée — the engine fuse box). The COM2000 steering-column module handles steering controls and airbag clock-springs, and the engine ECU manages powertrain. Common faults include BSI body and network issues, key/immobiliser faults, and charging problems. Diagnostics use Diagbox / Lexia.
Peugeot Control Modules & Electronics
Key modules and electronic systems used across Peugeot vehicles. Correct identification of the module is the first step in proper diagnosis.
BSI — Body Control Unit
Central body electronics; locking, lighting, comfort and network.
BSM — Engine Fuse Box
Power distribution and engine-bay electronics.
Engine ECU
Engine management (SMEF/EDC).
COM2000
Steering-column communication; airbag clock-spring and steering controls.
ABS / ESP
Stability control.
NAC Infotainment
Touchscreen and connectivity.
Common Peugeot Electrical Faults
Faults we frequently see on Peugeot 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 GUIDEPeugeot Models We Cover
Peugeot Electrical Fault?.
Tell us about your Peugeot, the symptoms and any warning messages. OBD_PAL diagnoses the complete system before recommending any repair — don't guess, diagnose it properly.