Shuts off while driving, code P0685

2013 MERCEDES BENZ SPRINTER

150,000 MILES • 2.3L • 4 CYL • TURBO • 2WD

KEOMA

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When driving with the van on open road the vehicle sort of switches off with all the dash board lights coming on for plus minus 2 to three seconds. then all is okay again except for the traction control lights which will staying on. This happens every few km while what is diagnose is a code P0685. Can that be the power train relay causing that and if so were can I locate it?

Many thanks

William

Sep 14, 2019 at 1:43 AM

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Hello,

Yep, this will cause the engine to stop running. I would replace the relay. here is the location in the diagrams below with a guide to help test it:

P0685 ECM/PCM Power Relay Control Circuit Open

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

here are the fuse panel and relay locations .Check out the diagrams (below). Please let us know what happens.

Images (Click to enlarge)

Sep 16, 2019 at 11:33 AM

KEOMA

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HI Ken
Many thanks for the prompt reply. I did replace relay K40/9k7 but it is still doing it. What I found is that when you drive on a straight road it does not do it but as soon as you go on a slight up hill or down hill and you accelerate that is when it happens.
Can there be any other relays involved?

Sep 19, 2019 at 3:28 AM

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It sounds like it could be a wiring problem while the engine is running try to move the wiring harness around to see if the engine will respond by stalling out. I think we might have a short. Can you please shoot a quick video with your phone so we can see what's going on, that would be great. You can upload it here with your response.

Sep 20, 2019 at 9:47 AM