TBC reading TBC fault at random - Ford Powerstroke Diesel Forum
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post #1 of 10 Old 04-10-2009, 10:42 PM Thread Starter
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TBC reading TBC fault at random

I dont know whats causing it.

I first noticed when i had a trailer hooked up, the TBC never shows a "red" trailer icon, but the dash reads "trailler disconnected" or TBC fault while towing, but the trailer brakes always work, so do the lights :/

I then realized it does this on 2 trailers...

Then when NOT trailering, the truck reads trailer disconnected and tbc fault sometimes at random.

Im thinking its a short in the wiring?

The preivous owner had a company install a gooseneck hitch AND 2nd put in INSIDE the left side of the bed. Both apparently work, are chean, dirt free etc.

Would this be caused by the 2nd adapter for the gooseneck plugs or is it something else?


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post #2 of 10 Old 04-12-2009, 07:04 AM Thread Starter
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no one?
.....


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post #3 of 10 Old 04-12-2009, 01:57 PM
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Mine does it when I hook up a trailer that has the big round plug, but only four of the wires are used. The trailer needs a 4 wire flat plug, but somebody put the big one on and just didnt use the other wires. If it is like mine, the truck thinks there is a trailer with brakes back there because something is plugged into it and something is wrong because they ain't working. May not be what is wrong with yours, but hope thuis helps.

Mine will show TBC on dash if I carnk it in neutral , instead of park, with a tune on it also. I have no idea why it does that, But everything seems fine!

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post #4 of 10 Old 04-12-2009, 02:00 PM
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Its usually one of two things. A loose connection. Or a faulty brake master cylinder

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post #5 of 10 Old 04-12-2009, 05:29 PM Thread Starter
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Quote:
Originally Posted by Dave View Post
Its usually one of two things. A loose connection. Or a faulty brake master cylinder
well hope its a loose connection lol. I think it beeps like "low fuel" sound when you hit some little bumps in the highway, thats normally when it says tbc fault or something. but sometimes its beeping over and over , a few times in less than a minute, so its annoying at the very least.

I dont want anyone else driving it until thats fixed for safety sake.


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post #6 of 10 Old 04-13-2009, 08:44 PM
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They all throw that fault when the voltage at crank is just a little low. Mine did it all the time before I changed the batts. My cousin's 05 and my friend's 06 dually did it too right before the batts took a dump. I'd check that first and then start looking for loose/shorting wires or a screwy master cylinder.


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post #7 of 10 Old 05-07-2009, 12:20 PM Thread Starter
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well truck went into the dealer today... theyre saying after a $125.00+ tax diagnostics that the Brake control module is bad and needs to be replaced..

They want $125 diagnostics, $350ish for the control module and i guess the rest is labor to install it.

Where is this part and seriously, how hard can it be to replace? ive rebuilt whole engines and parts of transmissions on GM cars in the past so im pretty mechanically inclined.. Is that part really that much?


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post #8 of 10 Old 05-07-2009, 12:29 PM
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controll modules are not cheap so i wouldnt doubt it but it should be that hard to replace yourself but i don't know if it will need to be programed.
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post #9 of 10 Old 05-07-2009, 06:35 PM Thread Starter
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Quote:
Originally Posted by psd_va View Post
controll modules are not cheap so i wouldnt doubt it but it should be that hard to replace yourself but i don't know if it will need to be programed.

well maybe i dont know as much about it as i thought. You cannot just buy one off ebay/craigslist/junkyard and disconnect your stock "broken" one, and connect the new one, what is it programmed for? The truck already has one so its a direct swap out.


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post #10 of 10 Old 05-08-2009, 04:46 AM
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The module itself might have to be programmed not the whole truck but I'm not sure it might be plug and play

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