GLC steering issue

Sounds familiar. I had comparable issues with my GLC. Vibrations, vague steering, the whole nine yards. First thing I'd check is the hydraulic fluid level. Low fluid can cause all sorts of weirdness in the steering system. After that, inspect the pressure hose for leaks. A leak there will definitely impact power steering performance. Have you looked at the steering rack itself for any visible damage or leaks? Those are the easy checks before you start suspecting the steering column or electrical gremlins.

Fluid level is fine, and I don't see any obvious leaks around the pressure hose or steering rack. Where exactly should I be looking for these cable or plug connection issues? Is there a specific area of the steering system that's known to be problematic?

Honestly, tracing those connections can be a pain. I didn't bother when I had the problem. In my case, it was easier to just take it to a workshop. They have the diagnostic tools to pinpoint the fault quickly. Could be a bad sensor or a corroded connector somewhere in the steering system. Save yourself the headache and let them diagnose it.

Thanks for the advice. I took it to a workshop, and you were right; it was a bad electrical connection. They replaced the connector, and the power steering is back to normal. Total cost was 95€. Appreciate the help.