Vauxhall / Opel Electrical Diagnostics
Vauxhall/Opel vehicles use a Body Control Module (BCM) with separate Underhood Electrical Center (UEC) and Rear Electrical Center (REC) power-distribution modules. Originally a GM architecture, now part of Stellantis, common faults include BCM body faults, immobiliser and key issues, lighting and charging problems. Diagnostics use Tech2/GDS2 and now Stellantis tools on newer models.
Vauxhall / Opel Control Modules & Electronics
Key modules and electronic systems used across Vauxhall / Opel vehicles. Correct identification of the module is the first step in proper diagnosis.
BCM — Body Control Module
Central body electronics; locking, lighting, comfort.
UEC — Underhood Electrical Center
Engine-bay power distribution.
REC — Rear Electrical Center
Rear power distribution.
Engine ECU
Engine management.
ABS / ESP
Stability control.
EPS — Electric Power Steering
Steering assistance.
Common Vauxhall / Opel Electrical Faults
Faults we frequently see on Vauxhall / Opel 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 GUIDEVauxhall / Opel Models We Cover
Vauxhall / Opel Electrical Fault?.
Tell us about your Vauxhall / Opel, the symptoms and any warning messages. OBD_PAL diagnoses the complete system before recommending any repair — don't guess, diagnose it properly.