Peugeot 806 headlight range control faulty

The symptoms you describe suggest a fault in the auto-leveling system. Have you inspected the electrical connectors to the headlight servomotors for corrosion or damage? Also, has the light intensity been manually adjusted recently using the in-cabin control?

Thanks for the reply! Where exactly are the servomotors located? And I haven't touched any in-cabin controls recently, at least not that I remember. Could it really be just a corroded connector?

The servomotors are integrated into the headlight assembly itself. While a corroded connector is possible, considering the error code and erratic beam behavior, a defective servomotor within the headlight is the likelier culprit. I recommend a workshop diagnoses the light unit's control module.

Okay, thanks so much for the advice! Turns out it was a defective servomotor as you suspected. The workshop confirmed it, and they quoted me 1040€ for the repair. Ouch!