josephmond1

G Klasse intermittent ignition issue

My 2007 Mercedes G Klasse diesel engine has an intermittent ignition failure, often refusing to start. Sometimes the engine shuts off while driving, and it runs rough at times. The dashboard light works during pre-ignition. I checked the ignition system fuse. Could it be the ignition coil or starter motor? Any diagnostic tips?

4 comment(s)

Sounds familiar. I had similar issues with my G Klasse. Did you check the car electronics thoroughly? It could be a loose connection affecting the ignition system. Have you tried a different key?

Thanks for the quick reply. I checked the main electrical connections, but maybe I missed something. When you had this, did the engine always fail to start, or was it intermittent like mine? Did any diagnostic codes show up?

It was intermittent for me. No codes that I remember. Honestly, with those symptoms, especially the engine shutting off, I'd suggest going to a workshop. It could be more complex than a simple fuse.

I appreciate the advice. I'll schedule a workshop appointment. It turned out to be a defective fuse costing 52€. Thanks again for your help.

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