Controller for vehicle

The invention provides a controller for vehicle. In a vehicle using an internal combustion engine and an electric motor as a vehicle driving source, failure diagnosis required to be executed is reliably executed while an internal combustion engine is in operation. Failure diagnosis of at least one of the internal combustion engine and accessory devices inclusive of a sensor mounted on the internalcombustion engine is executed while the internal combustion engine is in operation. The controller for vehicle includes a charging consumption mode operation and a fault diagnosis internal combustionengine operation. In the charging consumption mode operation, in order to maintain the charging amount of a battery without operating the internal combustion engine, the electric motor is used as themain vehicle driving source. In the fault diagnosis internal combustion engine operation, when the internal combustion engine operation start condition specified in the charge consumption mode operation is satisfied and the in