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I have a Volvo VNL 2013 with the following code active: SA 0…

Customer Question
Hello I have a...

Hello I have a Volvo VNL 2013 with the following code active:SA 0 SPN 1231 FMI 2

Mechanic's Assistant: Have you seen this error before with the same vehicle?

Has been active for a week

Mechanic's Assistant: What's the model of your 2013 Volvo?

VNL 670

Mechanic's Assistant: Hi there. Is there anything else the Volvo Mechanic should know before I connect you? Rest assured that they'll be able to help you.

No, thanks

Submitted: 9 months ago.Category: Medium and Heavy Trucks
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Answered in 2 minutes by:
12/12/2021
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 9 months ago
Mike Mcmillan
Mike Mcmillan, Shop Foreman/Triage Tech
Category: Medium and Heavy Trucks
Satisfied Customers: 6,621
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. Please allow me a few moments to look over your question and I will be right back with you. Thank you
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Customer reply replied 9 months ago
ok
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 9 months ago

The 1231 is a subnet fault code. This means a data link that is sub of the main data link on the truck. This link runs between the vgt turbo and nox sensors as well as some aftertreatment components. Usually there are other fault codes present which will usually be inactive. I would check with a scan tool and make sure there are no nox sensor issues or vgt fault codes. If there are none then I would have the ecm software updated.

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Customer reply replied 9 months ago
Two weeks ago I updated all the truck softwareI have several other Inactive codes:
SA 0 SPN 4094
SA 0 SPN 5246SA 0 SPN 5394What I would like to know is which subnet is to change it completely
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 9 months ago

Those are just inducement fault codes. If you have those faults as well you will need to run a parked regen and monitor the outlet nox reading. That subnet is called the DL7 and to change it completely you will need to replace the chassis and engine harness

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Customer reply replied 9 months ago
All the harness of the chassis ??The description says SAE J1939 Data Link 2
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 9 months ago

It is called the front chassis harness. The subnet runs in that harness as well as the engine harness.

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Customer reply replied 9 months ago
The engine harness, the dealer locates it quickly with the VIN Number, but you will havethe part number of the front chassis harness??
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 9 months ago

No I am sorry. The dealer I work for does not give the techs access to the parts side

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Customer reply replied 9 months ago
Okay I understand. But do you think I literally ask for the front chassis harness with the VIN Number the dealer will find it?
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 9 months ago

They should be able to get that right. There is only a front chassis harness, rear extension harness, tail lamp harness, F-cut harness, and a Dpf harness in the chassis

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Customer reply replied 9 months ago
Ok, perfect, thank you very much
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 9 months ago

My pleasure. Have a good day

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Customer reply replied 9 months ago
You too
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Mike Mcmillan
Mike Mcmillan, Shop Foreman/Triage Tech
Category: Medium and Heavy Trucks
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