On the electric power steering built from 2011 a recurring complaint is the assistance dropping out intermittently: the steering goes heavy while driving, then comes back after an ignition cycle. Over time it stops coming back, and the assistance is gone for good.
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The cause is often the steering rack's own control unit or the torque sensor. If the control unit does not communicate, diagnostics often returns no fault code at all, so "no fault code, so nothing is wrong" is wrong. If the assistance drops out while driving, the steering goes heavy, and you should have it checked the same day.
What to check
- Standing still with the engine running, turn the wheel lock to lock: the assistance should be even
- On the test drive watch whether the steering goes heavy, even for a moment
- After switching the ignition on, check the dash: there should be no yellow or red steering icon