Usamos cookies para análises básicas — nada é carregado até você aceitar. Você pode recusar e continuar navegando normalmente. Política de Privacidade
Diagnostic trouble code U0039 indicates: Vehicle Communication Bus B (+) Open. It was set by your vehicle's onboard diagnostics system and will typically keep the check engine light on until it's addressed.
Upload your ECU file and DTC Doctor will detect this code (and any others) automatically, then remove it for good — no dealer visit, no guesswork.
Analyze My File Free →