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I have an issue with aftertretment that just came up last…

I have an issue...

I have an issue with aftertretment that just came up last night on the freeway cruising at around 65-70 I got the warning said in 60 min engine will derate SCR system fault it said.

Mechanic's Assistant: What's the make/model/year of your truck? Engine type?

2015 Volvo VNL d13

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Answered in 4 minutes by:
4/4/2020
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 2 years ago
Mike Mcmillan
Mike Mcmillan, Shop Foreman/Triage Tech
Category: Medium and Heavy Trucks
Satisfied Customers: 6,613
Experience: Volvo/Mack Master Tech, Certified with Cummins, Eaton, GM, Hino, Detroit Diesel
Verified
Hello and thank you for using Just Answer. My name is ***** ***** I’d like to try and help. I am sorry that you are having issues with your truck. I know this can be frustrating. When you have that message there is an issue with the aft system. This can be bad def, scr wiring issue, biased aft sensor, bad nox sensor, etc. there are multiple test that will need to be ran with a service tool in order to narrow that issue down. Once the unit gets down to 5 mph you can unplug the speed sensor to get more speed. I hope this helps. Thank you
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Customer reply replied 2 years ago
thank you I actually have a code I pulled from the truck using its onboard diagnostics can I give you the code I am trying to narow down to what its most likely to be. I am actually a mechanic my self just haven't had any expiriance yet with semi-trucks
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 2 years ago
Sure, what is the fault you are getting?
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Customer reply replied 2 years ago
the fault is under Aftertreatment- SA 17 DTC P242A15
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 2 years ago
That fault is for scr conversion eff. That means that the outlet nox is higher than it should be. Which the items listed can cause this. There could be a plugged def doser or a hardened scr build up. I usually will run a regen and monitor nox levels when I have this fault to help pinpoint the issue
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Customer reply replied 2 years ago
thank you I think now I know what direction I need to take to get this figured out you have been a big help.
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 2 years ago
My pleasure. Have a good day
Mike Mcmillan
Mike Mcmillan, Shop Foreman/Triage Tech
Category: Medium and Heavy Trucks
Satisfied Customers: 6,613
Experience: Volvo/Mack Master Tech, Certified with Cummins, Eaton, GM, Hino, Detroit Diesel
Verified
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Mike Mcmillan
Mike Mcmillan
Mike Mcmillan, Shop Foreman/Triage Tech
Category: Medium and Heavy Trucks
Satisfied Customers: 6,613
6,613 Satisfied Customers
Experience: Volvo/Mack Master Tech, Certified with Cummins, Eaton, GM, Hino, Detroit Diesel

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