Check engine glow plug
#2
MBWorld Fanatic!
Join Date: Jan 2016
Location: In the Shadow of the Tetons
Posts: 2,343
Received 680 Likes
on
493 Posts
2013 ML350 Bluetec
I'd start by making sure the glow plug sees volts when it is meant to and then test the glow plug itself to make sure it is burned out. Depending on the results, replace the glow plug or repair the wiring.