Power-assisted Steering Intermittently Not Available at Engine Start-up. An EPS warning lamp may light up in the instrument cluster intermittently at engine start-up. At the same time, the power-assisted steering is unavailable. After switching the ignition off and then on again, the steering is available again. No fault codes are stored in the fault code memory of the electric power steering (EPS-I1). Electric Power Steering (EPS).