You have an Energi, and I'm looking at my hybrid owner's manual, but what you're describing sounds like "limp home mode". Under the Powertrain Fault section of the hybrid manual: Note: If your vehicle detects certain faults, it will not allow you to operate the accelerator pedal. If this happens, press the brake pedal and release it. This will activate limp home vehicle operation. In limp home vehicle operation, your vehicle will accelerate in a controlled manner up to a maximum speed of 35 mph (56 km/h) on a flat surface. If you apply the brake pedal or move the transmission to neutral (N) you can override your vehicle’s acceleration. Maybe look and see if the Energi has a similar mode? - Pete