GLK goes dead at stop light

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Jun 2, 2025 | 09:07 PM

#26

cottager777

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Joined: May 2013

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GLK 350

Quote:

Originally Posted by Odd Piggy

That reply from the dealer sounds like they just didn’t want to say they couldn’t find anything.

FYI-The Prefuse box isn’t really sealed and there’s only one electronic component in it that could shut the car down then reset. Everything else is a fuse. There’s no board. Maybe they were talking about the front SAM(?).

They definitely admitted they could not find the cause and said there was no "test" they could do on the prefuse unit. It does sound like the Prefuse as the cause magically went away 6 hrs later and never returned. (as per a reset? as you mentioned) If it happens again I will get it replaced. Let just hope if it does happen while i am not doing 120kph on the highway.
I don't remember them saying the term SAM.

Thanks for chiming in!

Jun 2, 2025 | 09:33 PM

#27

calder-cay

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Joined: Jun 2021

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From: South Texas

2014 GLK350 base model (active) ; 2001 E320 base (retired); 2001 Wrangler soft-top

Quote:

Originally Posted by cottager777

They definitely admitted they could not find the cause and said there was no "test" they could do on the prefuse unit. It does sound like the Prefuse as the cause magically went away

Had you ever driven thru a heavy downpour (rain), or thru some water-flooded roads, or similar conditions??

It seems those who have experienced this similar issue is because of that. Once all the invaded moisture dries up, the issue disappears.

And yea, thanks for the follow-up reply

Jun 2, 2025 | 11:32 PM

#28

Odd Piggy

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2021 GLB250 FWD, 2023 GLA250 FWD, 2013 C250, 2015 GLK350, 2005 ML350SE, 2003 E320

Quote:

Originally Posted by cottager777

Let just hope if it does happen while i am not doing 120kph on the highway.
I don't remember them saying the term SAM.

I wouldn’t be afraid of it happening with the engine running. If it was the prefuse box, then it was the quiescent current relay, whose job is to make sure there is cranking power available when the engine is off and accessories are on and it doesn’t have a memory.

The situation @calder-cay describes is usually the front SAM.

Jun 3, 2025 | 03:27 PM

#29

cottager777

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GLK 350

Quote:

Originally Posted by calder-cay

It was raining that morning but not super hard and i had not driven through any puddles. That does sound suspicious though!

Thanks

Jun 3, 2025 | 03:30 PM

#30

cottager777

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Junior Member

Joined: May 2013

Posts: 22

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GLK 350

Quote:

Originally Posted by Odd Piggy

I have a feeling it did have something to do with the ECO mode. The engine had just shut off. I can't remember if i had just started to lift my foot off the break or not. But i remember sitting their quietly (no engine) and then all of a sudden the lights went off.

Thanks for the positive message about it not happening when the engine is running!