TBC fault

Reply Subscribe

Thread Tools

Search this Thread

May 18, 2013 | 04:33 PM

emmagator

Thread Starter

Senior User

Joined: Aug 2006

Posts: 333

Likes: 0

From: Roseburg, Or

TBC fault

Truck is displaying a TBC fault, without a trailer. I havent towed in about 6 months. Anyway from researching seems it could be a bad TBC unit or something to do with the brake master cylinder. However, when i get the TBC fault, it appears only for a few seconds and then goes away, i dont have to reset the onboard dash display. Any ideas?

May 18, 2013 | 07:57 PM

BPofMD

FTE Remembers

Joined: Jul 2005

Posts: 65,938

Likes: 1,433

From: Millersville, MD

Drop the rear 7 & 4 way trailer plugs and see if any of the wires inside are corroded and shorted.

May 18, 2013 | 08:51 PM

emmagator

Thread Starter

Senior User

Joined: Aug 2006

Posts: 333

Likes: 0

From: Roseburg, Or

Quote:

Originally Posted by BPofMD

Drop the rear 7 & 4 way trailer plugs and see if any of the wires inside are corroded and shorted.

Yea i checked the plugs, they look real good. No corrosion at all.

Am i interpreting the other TBC fault threads correctly? It sounds like guys who get this fault have the fault code stay on their in dash display until they manual press the reset button, correct? Since my only stays for a few seconds leads me to believe it is some kind of short.

May 18, 2013 | 08:55 PM

BPofMD

FTE Remembers

Joined: Jul 2005

Posts: 65,938

Likes: 1,433

From: Millersville, MD

You DID remove the metal shell of the 7-way and look inside, right? If so, you're going to have to check the wiring along the frame rail all the way from back to front for a wear point.....

May 18, 2013 | 09:22 PM

emmagator

Thread Starter

Senior User

Joined: Aug 2006

Posts: 333

Likes: 0

From: Roseburg, Or

Quote:

Originally Posted by BPofMD

You DID remove the metal shell of the 7-way and look inside, right? If so, you're going to have to check the wiring along the frame rail all the way from back to front for a wear point.....

If your talking about the wiring harness plug that plugs into the 7way, yes i did.

When a TBC fault trips does it usually stay on dash until manually reset?

May 19, 2013 | 06:16 AM

ooms221

Junior User

Joined: May 2012

Posts: 50

Likes: 0

I had a TBC fault come up on my dash and it would be a few seconds after I starred pressing the brakes with nothing in tow. It ended up being that I had no break lights and it was the switch that is under the brake pedal

May 22, 2013 | 07:32 PM

emmagator

Thread Starter

Senior User

Joined: Aug 2006

Posts: 333

Likes: 0

From: Roseburg, Or

Wanted to give and update on this issue. There are two plugs that plug into the bottom of the brake master cylinder. When i was messing around in there changing my ebp sensor i knocked the plug loose, causing my tbc fault. Secured the plug, problem solved. Thanks for the replies.