robinschulz78

Mercedes GLK Diesel Engine Issues

My 2009 Mercedes GLK, diesel engine, with 102524 km on it, is giving me fits. The preheating lamp refuses to switch off, the check engine light is on, and it's blowing smoke when I accelerate. A diagnostic test suggests a defective glow control unit. Could a dodgy cable or plug really cause all this? Has anyone else seen this before?

4 comment(s)

Sounds plausible. A bad connection to the glow control unit could definitely cause those symptoms. Engine light, smoke, preheating issues... they all kinda fit. Have you checked the connections yourself? Maybe some corrosion?

I had a look, but I'm no expert. Is there a specific way I should be checking the cable and plug connection? Like, what am I looking for exactly besides obvious corrosion?

Without proper tools, it's hard to say definitively. You might be able to spot broken wires, but sometimes it's internal. Given the engine light and smoke, it's probably best to get it to a workshop. They can run more detailed tests.

Thanks. I took your advice and went to a workshop. You were right. Turns out it was a corroded connector on the glow control unit. New connector and a bit of cleaning, total cost 95€. At least the engine misfire and engine light are gone!

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