Hybspec

U0280

Wysoki

Lost Communication with Control Module (CAN Network) – No communication with vehicle network node. Network diagnostic code regarding interruption of data exchange between controllers.

OBD-II (EN): Lost Communication with Vehicle Control Module (CAN)

Code U0280 indicates a problem with communication in the vehicle's CAN network – controllers cannot exchange data, which may cause power seats, HVAC, and other comfort systems to stop working. The most common causes are a damaged communication harness, corroded connectors, or a faulty controller. Due to the complexity of CAN network diagnostics, a visit to a workshop with a professional diagnostic scanner is recommended.

Symptoms

No operation of power seat adjustment; inactive HVAC system; CHECK ENGINE light or network icon on the dashboard; possible limitation of vehicle comfort functions; other related modules may report communication errors

Possible causes

• Damaged or broken CAN bus (data bus High/Low) • Corrosion or loose connectors in the communication harness • Faulty network node controller (e.g., BCM, seat module) • Short circuit in CAN bus wires to ground or power • Faulty or discharged power supply for controllers (lack of 12V / ground)

Affected systems

Sieć CAN (Controller Area Network)Moduł nadwozia (BCM)Moduł sterowania siedzeniamiSystem HVAC (ogrzewanie/wentylacja/klimatyzacja)Magistrala komunikacyjna sterowników

Related codes

U0300Wysoki

Niezgodność oprogramowania wewnętrznego modułu sterującego. Kod wskazuje na konflikt wersji oprogramowania między modułami ECU w sieci CAN pojazdu.

Komunikacja sieciowa
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Does code U0280 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.