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go-west.., Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 1131
Experience:  Technican with 20 years experience focused on engines and electrical.
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My truck 2012 Cascadia show fault code sfu 49. What is it? I

Customer Question

Hi my truck 2012 Cascadia show fault code sfu 49. What is it?
JA: Sometimes things that you think will be really complicated end up being easy to fix. The Heavy Truck Mechanic I'm going to connect you with knows all the tricks and shortcuts. Tell me a bit more about what's going on so the Heavy Truck Mechanic can help you best.
Customer: I just change new starter. And it come up that sfu 49, after change new starter
JA: Is there anything else the Heavy Truck Mechanic should be aware of?
Customer: Old starter Delco Remy(###) ###-#### and the new Delco Remy(###) ###-####
Submitted: 1 month ago.
Category: Medium and Heavy Trucks
Expert:  go-west.. replied 1 month ago.
Good morning
Sfu code is for the switch field unit
49 is only half the code
If you push the button with the bent arrow then you be able to get the rest of that code. Like 49 fmi 45 or something like that
Let me know
Customer: replied 1 month ago.
Ok, my truck is in the yard and I'm away from it. I let you know when ready
Expert:  go-west.. replied 1 month ago.
Take your time
Customer: replied 1 month ago.
Hi I'm back
Customer: replied 1 month ago.
This process go like this: diag 1, fault 1, SFU 49, 52030 2 SPN
Customer: replied 1 month ago.
Are you there?
Customer: replied 1 month ago.
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Expert:  go-west.. replied 1 month ago.
I'm here
52030 it's the number I need but it's 6 numbers
You have given me 5
Please check again
Customer: replied 1 month ago.
Customer: replied 1 month ago.
Is 520302 the right number!
Expert:  go-west.. replied 1 month ago.
It means one of your switches in the dash or sleeper is shorted low
You can still run the truck with no worries
Usually what happens is pop or coffee leaks in and causes problems.
Remove the switch that has the hazard triangle in it.this is the msf or switch master. You will see 3 pin connectors. These are the ones I'm talking about they connect all the switches together in the truck. Check for corrosion. To remove switch modules. on the end of switch module you will see tabs one on each side. Pull both tabs out about 1 inch and the switch modules will come right outGood luck
And let me know how you to
Customer: replied 1 month ago.
I will check it with your instructions. Will let you know the result later. Thanks for your kindness and time.
Expert:  go-west.. replied 1 month ago.
No problem
Please accept if satisfied
Expert:  go-west.. replied 1 month ago.
Good morning
Haven't heard from you. Do you have any other questions?

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