Mercedes W166 recommission
Thread Starter
Newbie
Joined: Oct 2021
Posts: 7
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From: Aberdeen, Scotland
2012 W166 ML250 Sport. 2001 Kubota M5700. 2016 Volvo XC60 D5
Mercedes W166 recommission
My ML250 has been laid up since the start of the pandemic whereby I had just serviced it. It had also just had a new battery installed, walked out to it one morning and completely dead, changing the battery was a bit of a task with no power. Anyway, the EML light came on not long after and the codes thrown up were;
P0685-The output for Relay Circuit 87 has an electrical fault on an open circuit
P20BD1B - The output for heating element of the adblue tank has an electrical fault on an open circuit.
I can manage the mechanical recommissioning, brakes, servicing, new batteries, auxiliary included but have no idea what Circuit 87 and feel like i'm likely going to need a new adblue heater, I have seen the XeModeX replacement which is more attractive price wise than the Bosch unit from MB.
I suspect something took a surge when I connected the battery in 2020, the replacement battery is also dead, any suggestions as to how to approach the electrical issues, any help would be much appreciated.
P0685-The output for Relay Circuit 87 has an electrical fault on an open circuit
P20BD1B - The output for heating element of the adblue tank has an electrical fault on an open circuit.
I can manage the mechanical recommissioning, brakes, servicing, new batteries, auxiliary included but have no idea what Circuit 87 and feel like i'm likely going to need a new adblue heater, I have seen the XeModeX replacement which is more attractive price wise than the Bosch unit from MB.
I suspect something took a surge when I connected the battery in 2020, the replacement battery is also dead, any suggestions as to how to approach the electrical issues, any help would be much appreciated.
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Joined: Sep 2018
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From: unbegrenzt
2017 GLE350 4MATIC
In which market/country are you located? In the US owners can receive emissions system modification which made address some of the vehicle issues at no cost to you. When the vehicle is getting the emissions work done the dealer can advise you on your options for the other work needed. You might have to tow the vehicle to the dealer for the above to be successful.
Thread Starter
Newbie
Joined: Oct 2021
Posts: 7
Likes: 4
From: Aberdeen, Scotland
2012 W166 ML250 Sport. 2001 Kubota M5700. 2016 Volvo XC60 D5
MBWorld Fanatic!
Joined: May 2021
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From: US
2008 E350, 2012 ML350, 2014 E350, 2015 ML350
I got that information from the Daimler webpage
https://www.daimler.com/innovation/d...ecall-faq.html
Perhaps worth some reading and few phone calls? Good luck
Thread Starter
Newbie
Joined: Oct 2021
Posts: 7
Likes: 4
From: Aberdeen, Scotland
2012 W166 ML250 Sport. 2001 Kubota M5700. 2016 Volvo XC60 D5
Thanks for the information, definitely worth seeing what the dealer says. I think I've got to the bottom of the fault codes, one is an open circuit on a relay in the PCM and the other is related to heater B, which is the element in the Adblue tank. I'm toying with the idea of getting the ML MOT'd and go looking for a W123 230CE as a replacement.
