Utrata komunikacji z BCM (moduł nadwozia)
B0305
ŚredniCode B0305 refers to a body system fault – most often related to the electrical circuit of the seat control module or another body component, depending on the vehicle manufacturer.
OBD-II (EN): Body Control Module Circuit Fault
Code B0305 is a body system fault, most often related to electric seat adjustment or the BCM module. Causes can include a faulty adjustment motor, broken wiring harness, or controller failure. Due to the specificity of this code for different manufacturers, professional diagnosis with a dedicated scanner is recommended.
Symptoms
Possible symptoms include: inoperative power seat adjustment (no forward/back or up/down adjustment), fault warning light on the dashboard, error message in the Body Control Module (BCM), possible limitation of vehicle comfort functions.
Possible causes
• Faulty seat adjustment motor • Open or short circuit in the seat wiring harness • Faulty Body Control Module (BCM) • Damaged connector or wiring harness near the seat • Defective seat adjustment switch
Affected systems
Related codes
Kod B0300 oznacza usterkę modułu sterowania nadwozia (BCM), który odpowiada za funkcje elektryczne pojazdu, takie jak oświetlenie, szyby czy centralny zamek.
Usterka obwodu silnika elektrycznie sterowanej szyby. Sterownik nadwozia wykrył nieprawidłowe napięcie lub przerwę w obwodzie mechanizmu podnoszenia szyby.
Usterka systemu bezpieczeństwa / poduszki powietrznej pasażera – nieprawidłowe działanie mechanizmu wyzwalania. Kod wskazuje na problem z systemem SRS lub immobilizerem pojazdu.
Code B0305 appears in these brands
Go to messages and symptoms for your brand — there we analyze this code together with other typical alerts.
Sources and further reading
Does code B0305 require professional diagnostics?
The code alone is not enough. To find the cause, you need to read live data, check freeze frame conditions, and compare with vehicle behavior. Book a diagnostic session.
