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'08 F250 Diesel, No Crank, TBC Fault

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Old 02-16-2013, 09:44 PM
RIDETHE RIDETHE is offline
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'08 F250 Diesel, No Crank, TBC Fault

I've been pinging a bunch of forums trying to see if anyone has seen anything like this. I went out to start my truck the other day, and got a no crank condition. Theft light is flashing at me, and it says "CHECK BRAKE SYSTEM" "TRAILER BRAKE MODULE FAULT" Won't even let me shift into neutral to roll down my driveway. What's weird is my MiniMaxx buttons aren't working. I've already checked the pertinent fuses to no avail. I have the shop manual, and the pinpoint test for no scanner communication with the TBC seems to indicate that it's a bad TBC. I've tried leaving the Mini disconnected when starting, and it doesn't seem to make a difference. I did leave the batteries unplugged overnight, and it started up normal, but this morning, it's all locked up again. I have noticed that the TBC display no longer lights up when I turn the key on, and it does have key-on power at the plug. Has anyone seen anything like this or had a TBC go bad? I don't want to buy a $300 TBC if that's not the issue.

VID 20130212 210651 - YouTube
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Old 02-17-2013, 03:49 AM
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Moved to the 6.4L Power Stroke Diesel forum.
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Old 02-17-2013, 06:47 AM
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You can unplug the module to eliminate it as the cause.

Below the aux power and the 4x4 switches there are two little pieces of trm that come out with a screw driver. Behind that are one bolt for each side. I think 8mm.

Once you take those out you can remove the entire trim around the radio/hvac/and stuff.

If I recall the module comes out with that. Then you should be able to access the wiring behind it to unplug it.

See what that does.

Possible it is some moisture at the plug by the reciever causing some problems as well so check all your wiring from recieve on back towards the cab.
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Scott-2013 F350 with a lot of tires.
2013 40' 4-slider stoneridge 5th wheel coming in at 15,400; 2015 Lincoln MKC
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Old 02-17-2013, 10:34 AM
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I've tried unplugging it with no luck. I was getting the "Trailer Wiring Fault" message when it rained because the cover to the plug was broken off, but I removed the trailer plugs entirely to eliminate that possibility. I can't find anyone who's had these exact symptoms
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Old 02-17-2013, 10:39 AM
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tough one..I have never heard of what you have either. Perhaps the sensor for the TBC at the master cylinder maybe bad?
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Scott-2013 F350 with a lot of tires.
2013 40' 4-slider stoneridge 5th wheel coming in at 15,400; 2015 Lincoln MKC
http://www.ford-trucks.com/guidelines.html

Previous Truck 2008 F250 6.4 with lots of upgrades and a suspension upgrade from Torklift International StableLoads
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Old 02-17-2013, 04:15 PM
RIDETHE RIDETHE is offline
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I swapped in a TBC from a good truck, and still no change. Anyone have more ideas?
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Old 02-17-2013, 05:50 PM
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Just the sensor at the master cylinder.

Check with the tuner people and see what they say.
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Scott-2013 F350 with a lot of tires.
2013 40' 4-slider stoneridge 5th wheel coming in at 15,400; 2015 Lincoln MKC
http://www.ford-trucks.com/guidelines.html

Previous Truck 2008 F250 6.4 with lots of upgrades and a suspension upgrade from Torklift International StableLoads
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Old 03-15-2013, 11:12 PM
RIDETHE RIDETHE is offline
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Well, after much frustration and profanity:

VID_20130315_195233 - YouTube

Loose lug off the positive battery terminal clamp. Glad it was simple, but what a bitch to find.
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Old 03-16-2013, 06:34 AM
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Don't you just hate it but love the easy fix as well!
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Scott-2013 F350 with a lot of tires.
2013 40' 4-slider stoneridge 5th wheel coming in at 15,400; 2015 Lincoln MKC
http://www.ford-trucks.com/guidelines.html

Previous Truck 2008 F250 6.4 with lots of upgrades and a suspension upgrade from Torklift International StableLoads
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