DDoone

My '13 C250 coupe makes a single short buzz or groan when I turn off the ignition after a drive. It seems to come from the drivers side rear of the car. I think it might be a pressure relief valve in the fuel loop at the fuel pump, the dealer service dept hears it but has no idea what it could be since everything works ok. Anyone else have this experience? My unit is a November 2012 build. Thanks.

Jubair Ahmed

I notice it sometimes on my C350 and I thought it was just the HDD in the COMAND system powering down (the buzz sound).

DDoone

No hdd in my unit.

Ikester

My '11 C300 does the same thing, but its subtle.

And my father's 07 E350 did the same

dol4er

Mine also has it.