Chevy and GMC Duramax Diesel Forum banner

1 - 4 of 4 Posts

·
Registered
Joined
·
848 Posts
Discussion Starter #1
My cousin has a 2008 chevy 2500 duramax, LTZ. it has the built in brake controller, the other day we were hauling a load of roofing shingles off to the dump and the trailer brakes would not work. He has had 2 dealerships look at it and no one knows. any ideas? it says "service break controller" and it happens with every trailer.
 

·
Registered
Joined
·
417 Posts
I got the same message and took it to the dealer. They covered it under warranty, Said that there was a service bulletin out for it.
 

·
Registered
Joined
·
2,354 Posts
There are several things that it could be, but the 1st that comes to mind is both easy to check and easy to fix.

When you step on your brake pedal, your trailer is plugged in, the DIC shows little squares that start at the left and will add more squares to the right as you increase the brake pedal pressure. If yours does this, you have another problem. However, if yours does not show this increasing squares display, you are in luck. There is a pressure sensor mounted on the engine side of the master cylinder that senses the amount of brake pressure you are applying and converts this to electric pressure (voltage) - more pressure in the brake master cylinder, more voltage it produces. If the valve doesn't work, you don't see the little squares on the DIC and you don't get braking at the trailer. Just replace the sensor and the job is done, about $70 or so.
 
1 - 4 of 4 Posts
Top