100% Free

No Scanner Needed

Carly logo
Prices

claraloewe1

V Klasse preheating issue

My 2012 Diesel V Klasse has a suspected preheating control unit malfunction at 83441 km. The preheating lamp stays on, the check engine light is lit, and there's smoke during acceleration. I suspect a cable or plug issue. What are the diagnostic steps for this electrical fault with the heating module? I expect the repair to cost around 95€.

Summary of the thread

A 2012 Diesel V Klasse experienced a preheating issue, indicated by the preheating lamp staying on, the check engine light being lit, and smoke during acceleration. The suspected cause was a malfunction in the preheating control unit, possibly due to a cable or plug issue. Diagnostic steps included checking the glow plugs and their connections. The problem was confirmed to be a faulty connection to the preheating control unit, which was repaired at a cost of approximately 95€, resolving the issue.

Did this summary help you solve your problem?

4 comment(s)

miaschulze52

I had a similar issue with my V Klasse. The preheating light stayed on, and the engine acted up. It was a bad connection to the glow plugs, like a loose wire on a lamp. Did you check the glow plugs themselves? They might be the problem.

claraloewe1 (community.author)

Can you tell me where the glow plugs are and how to check if they are working? I want to learn more about the ignition system.

miaschulze52

The glow plugs are usually screwed into the cylinder head, near the injectors. Checking them needs tools. It's like checking the voltage on a battery, but you're testing the glow plugs' resistance. If you're not comfortable, a workshop can pinpoint the issue and might save you trouble.

claraloewe1 (community.author)

I consulted a workshop, and they confirmed a faulty connection to the preheating control unit, as suspected. The repair cost was about 95€, and it fixed the problem. Thanks for the help.

rmh_community_comment_box_header

community_crosslink_scanner_headline

community_crosslink_scanner_intro

community_crosslink_scanner_title

community_crosslink_scanner_price

community_crosslink_rmh_headline

community_crosslink_rmh_intro

community_crosslink_rmh_title

community_crosslink_rmh_subtitle

community_crosslink_rmh_brand

MERCEDES

community_crosslink_rmh_model

VKLASSE