Exterior lighting circuit malfunction
Where to start
The exterior lighting circuit. Start with the bulb and its holder: a blown bulb causes this code more often than everything else put together. Then the fuse and the lamp connector, which fills with water. ⚠️ A special case is LED bulbs fitted in place of ordinary ones: the module watches the current in the circuit, an LED draws several times less, and the car honestly decides the bulb has blown. If the code appeared right after a bulb change, there is nothing to search for — you need load resistors or standard bulbs. Check the rear of the car with a helper: half the «faults» here turn out to be a bulb that lights but sits badly in its holder.
How to put together a report a mechanic will actually read
How the code is built
All codes in «Body, airbags and lighting»
How the app helps
CarScan reads this code from your car through an OBD-II adapter, shows whether it is active now or only stored, names the module that reported it, and puts it into a plain-text report for your mechanic.