Abstract: A failure detection circuit for a motor vehicle electronic computer, including: a main microcontroller having at least two microcontroller cores configured to execute the same instructions in parallel, and at least one first software module providing a critical function of a motor vehicle. The first software module includes a predetermined input point and a predetermined output point a supervision microcontroller and a synchronous communication interface for coupling the main microcontroller and the supervision microcontroller so as to enable mutual supervision. The detection circuit makes it possible to detect systematic and random failures.

Abstract: A circuit (100) for detecting faults for a motor vehicle electronic computer, comprising: ? a main microcontroller (110) having, —at least two microcontroller cores (111, 112) configured to execute the same instructions in parallel, and—at least a first software module (113) providing a critical function of a motor vehicle, the first software module comprising a predetermined input point (Pin) and a predetermined output point (Sout) ? a supervision microcontroller (120) and ? a synchronous communication interface (130) for coupling the main microcontroller (110) and the supervision microcontroller (120) in such a way as to allow mutual supervision. The detection circuit makes it possible to detect systematic and random faults.