stefanfuchs9

GLK Reduced Power and Flickering Lights

I've got a 2009 Mercedes GLK with a gasoline engine. The engine power seems reduced, and there's a warning light on the speedometer. It's also started poorly a couple of times. I've noticed the lights are weak and sometimes flicker. The error memory has something stored, but I don't have the exact code right now. My suspicion is a faulty generator, and from what I've seen online, an alternator replacement might be needed. I am looking at 960€ for the repair. Could this be related to a battery low issue or a voltage drop somewhere in the charging system?

A 2009 Mercedes GLK is experiencing reduced engine power, a warning light on the speedometer, poor starting, and flickering lights. The suspected cause is a faulty alternator, potentially leading to a voltage drop or battery issues. The solution involves checking battery terminals for corrosion and confirming the alternator's condition. Ultimately, a mechanic confirmed the alternator was defective, leading to its replacement.

Did this summary help you solve your problem?

4 comment(s)

I had a similar alternator issue with my GLK. Reduced power and flickering lights sound familiar. A voltage drop can definitely cause those symptoms. Have you checked the battery terminals for corrosion? Sometimes a bad connection can mimic alternator problems. The alternator is basically what keeps your battery charged while the engine is running. If it's not producing enough power, your battery slowly drains, leading to all sorts of electrical weirdness. By the way, the charging system is responsible for keeping the battery charged by using the alternator.

Thanks, that’s helpful. I haven't checked the battery terminals myself yet, but I can definitely take a look. Was your issue also intermittent at first? And did you eventually need a complete alternator replacement, or was it something else causing the charging system problem?

Yes, my issue was intermittent to begin with. It started with occasional flickering lights and then progressed to reduced power. I eventually needed a complete alternator replacement. Based on your symptoms and the error stored in the memory, it sounds like you are heading in the same direction. I'd suggest having a workshop confirm the generator is defective. It is better to let professionals handle the alternator issue and confirm the repair cost.

Thanks for sharing your experience. That's really useful to know. I took it to a mechanic, and they confirmed it was indeed the alternator. Getting the alternator replacement done now. Appreciate 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

GLK