100% Free

No Scanner Needed

Carly logo

manuelmond53

Mercedes C Klasse Diesel Glow Plug Issue Resolved

My 2016 Mercedes C Klasse diesel has issues The preheating lamp stays on, the engine light is on, and it smokes when I accelerate A diagnostic test says the glow control unit is defective The car has 267355 km Could it be a bad connection

4 comment(s)

friedhelmschmitz1

That's a plausible diagnosis The glow control unit manages the glow plugs, which help start your diesel engine, especially in cold weather When they don't work, it can cause rough starts, smoke, and poor performance The engine light is triggered because the engine management system detects a fault A faulty cable or plug connection is a common cause, so your diagnostic test might be right Check the wiring to the glow control unit and glow plugs before assuming the unit is completely gone

manuelmond53 (Author)

What should I look for when I check the wiring Do I need special tools

friedhelmschmitz1

When checking the wiring, look for frayed wires, corroded connectors, or loose connections Sometimes a visual inspection is enough You could use a multimeter to test the continuity of the wires, but if you're not comfortable with electrical testing, it might be best to have a professional take a look A proper diagnostic test at a workshop will pinpoint the exact problem However, you're probably on the right track with the glow plug system If it is the control unit, I'd guess around 95€ for the part

manuelmond53 (Author)

I checked the wiring, and everything seemed okay, so I took it to a workshop The glow control unit was indeed defective They replaced it, and now the preheating lamp is working normally, the engine light is off, and the smoke is gone Cost me 95€ for the part Really appreciate the help

Join the discussion now: