Lets say an automatic transmission vehicle is going downhill and stopped in traffic. And suddenly engine died. Is it possible for the wheels to turn (turning the transmission, torque converter) and vehicle to go forward?
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1 Answer
If the engine stops while in gear (and brakes not pressed) it IS still possible for the vehicle to roll or continue rolling. Brakes will require additional foot pressure to maintain the same amount of braking power.
If moving: The wheels will continue to rotate, however on some vehicles it will create an 'engine braking' effect and the resistance of the engine will slow your car down. This "engine brake" effect does not apply to modern automatic transmission vehicles. They will continue to roll without resistance.
Just a note: You'll also lose power steering and 'powered' braking. If key is turned to full "off", the steering column will lock too. However, you cant turn key to full "off" while in-gear.
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"however it might create an 'engine braking' effect and the resistance of the engine will slow your car down." Modern automatics do not do this– MoabCommented May 20, 2016 at 15:03
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Thanks, I was testing this today. You're correct. I figured there would be some cars that have the 'engine brake' effect, but since most will not (unless its a motorcycle, etc.) I have removed that portion of my answer. Commented May 20, 2016 at 15:27
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Automatics are hydraulic, so if the engine is not running to drive the front pump, then nothing is engaged, so it cannot turn the motor.– MoabCommented May 20, 2016 at 16:29