Fcan data bus failure

First get a lawyer lined up just in case you need to move this to court.

Then call Perterbilt, ask to talk to the regional manager for that dealer and talk to them.

Don't mess with the dealer at this point.

DO NOT mention your lawyer, that won't matter.

If they are a good manager, he/she will look into it and may have the truck go to another dealer within their district to see what is actually going on.

 

Try finding a company near you that runs a fleet of similar trucks to yours. Call and talk to their shop. They probably would be able to tell you what's going on to cause the problem. They may be able to fix it for you. I chased an electrical issue for 6 months in and out of dealerships because my Peterbilt would blow a headlight at least once a month. Turned out to be the plug the light bulb connected to had gotten too hot and melted inside . 3 different dealerships said it was the chassis computer. It was a $5 fix.

 

Is the truck even in warranty? I highly doubt from what the OP typed. Just because they fixed a few issues and fleeced you for something unrelated doesn't mean that they are now obligated to fix the real issue that you brought the truck in for without further payment. It's ALWAYS about the money. It sounds like they fixed other unrelated issues with your truck that they may/may not have been required to repair. Did you sign a blanket release and agree to pay charges? Was there a clause to call you if charges went over a certain dollar amount or were unrelated to your original complaint?

Any attorney is going to want a retainer and you had better be darned sure you are within your rights before you plunk down another 2k for a retainer if you signed your life away because English is your 2nd language. I mean ZERO disrespect by that. The devil is always in the details.

With Ford Motor Company i discovered that there are many bulletins (service recalls) done and paid for by the company ONLY if the customer complains or notes the issue. A few manufacturers and a recall suggested the OP's original issue, Fcan data bus failure exterior lights.

Run the VIN and possibly get free help..... or don't.

 

I don't work on Paccar products much mostly Volvo, International and Freightliner.
From my experience most electronic problems are caused by poor connections
and broken wires.
Start at the batteries and clean all the terminals make sure any power supply wires
from the batteries to the harnesses are clean. There are probably fuses in the
battery box check them for corrosion. Also check any plug type connectors in the
battery box. Make sure all the battery grounds are tight including at the starter.
There should be grounds to the frame and engine block. Have a good look at
the harnesses for rubbed spots. If the insulation gets a worn spot or crack the
copper wire inside can corrode away causing an open circuit. give any suspect
spots the "Ten Pound Pull Test".
The in cab fuse box in a Peterbilt is in a damp location so it would not hurt to pull
the cover and have a look.

 

I think we're missing part of the story. I can't see a mechanic, let alone a dealership, replace a NOx sensor and turbo actuator for an exterior lighting canbus fault.

I'm guessing there was emission issues in the truck as well and not just a lighting error.