Mercedes GLC Hybrid Engine Knocking Resolved

I had similar issues with my petrol GLC. Knocking, jerking, loss of power. It sounds like pre-ignition or detonation, potentially from carbon deposits creating hotspots. Have you checked your knock sensor readings? If the ECU is pulling timing, that explains the power loss. Ignoring this can damage your cylinder heads.

Thanks for the response. I haven't checked the knock sensor readings. Could you explain how to access and interpret that data?

You'll need an OBD-II scanner to read live engine parameters. Look for 'knock retard' or 'ignition timing correction' for each cylinder. Retard values over a few degrees mean the ECU is compensating for knock. Given your symptoms, I advise against prolonged operation. Driving with detonation can cause engine damage. A technician should inspect the cylinder heads and combustion chambers for carbon buildup. Consider professional cleaning. Take it to a workshop immediately. Driving it like this makes it worse.

I appreciate the advice. I consulted a technician, and it was carbon deposits in the combustion chamber causing pre-ignition. After cleaning, the engine runs smoothly, and the error is gone.