Aims: The study aimed to explore the association between maternal communication style (controlling vs. autonomy supportive) and adolescents' motivation to change alcohol use, as well as the intervening role of autonomy and relatedness needs frustration and coping responses (i.e., oppositional defiance and submission) in this association. Methods: A vignette-based study was conducted with 134 adolescents (Mage = 17.46 years) randomly assigned to a controlling or an autonomy-supportive condition, describing a maternal reaction to an alcohol use episode. Then, adolescents reported upon their experienced need frustration, their coping responses and their motivation to change alcohol use. Findings: Results indicated that adolescents in the controlling condition felt more frustrated in their needs for autonomy and relatedness that adolescents confronted with the autonomy-supportive reaction. When adolescents experienced frustration regarding their autonomy need, they coped by submitting to the maternal request, which in turn predicted greater motivation to change alcohol use. However, when they experienced frustration regarding their relatedness need, they engaged in oppositional defiance to the request, which in turn predicted lower motivation to change alcohol use. Conclusions: These results suggest that controlling maternal communication style relates to two distinct processes that have opposing effects on adolescents' motivation to change alcohol use.