Steering wheel jerks when entering into a turn, both left and right.

problems in the steering control valves in the rack and pinion unit
take it to an accredited steeing specialist shop and have the systems pressure tested and properly diagnosed

bad servo in steering rack. check for any leaks. probably leaking internally

I’m happy to assist further over the phone at https://www.6ya.com/expert/howard_977676954994c5b2

could be a differential problem, or half shaft broken where power is only going ot one wheel. when the car accelerates the wheel with power can cause the vehicle to jerk. could also be a wheel problem. ensure the tyres are inflated correctly. is the steering wheel straight or turned to one side when driving in a straight line. if turned there may be damage to the steering system. did the symptom start after another person has driven the vehicle? or after an accident or driving into a curb or off road? all these may be factors to the problem. if not the case try rotating the wheels front left to rear right and front right to rear left to see if the problem disapears. if persists seek professional to test drive the vehicle and give an appraisal to the cause.

I hope this was helpful.

If the key won\'t turn it suggests the steering wheel is pressing hard on the stop that locks it. Try twisting the steering wheel left and right while attempting to turn the key. That happened to me once when I parked on a hill and turned the wheels so it would bump the curb and not roll away. I had to jerk the steering wheel pretty hard before it let go. If that doesn\'t fix it you may have a real problem inside the switch where something came loose and is blocking the switch from turning. I sure hope jerking the wheel with fix this for you.

power steering pump valve sticking .

sounds like the power steering rack

Try turning the key while jerking the wheel left and right and depressing the brake pedal. If that won't work try another key.

First make sure it is actually the pump and not the drive belt to the pump. If that checks out ok, then remove the P/S fill cap and turn the steering wheel fully left and fully right 10 times. This will remove any trapped air from the system. If that does no good then purchase a can of Seafoam Trans-Tune and add 2 ounces to the reservoir. If that still does not solve your whining & jerking problem after about 25 miles of driving, then the pump will have to be replaced.

sound like your powersteering pump or steering rack and pinion
could be bad.i would say it is your rack and pinion because if your pump was bad your steering would be real hard to turn instead of being jerky.jerking is usally the sign of a bad rack
samboiv