Brake ecu location??????

usually on frame. Knorr Bremce Advanced ABS with ESP ore ABS-D/E by Wabco. so look for on frame x-member under sleeper

 

location at rear driver seat

 

The abs ECU is in one of two places either mounted on the frame on the cross member right behind the transmission this is a wabco ABS ECU the other is mounted underneath the fuse box right behind the suspension dump switch that's the Bendix ECU I would Check the fuses first you should have two 15amp fuses if you accidentaly took one out it will usually throw out that code I've never seen one go bad on a Truck 2004 and up, but you never know let me know what you find

 

So is this the same box that says not to change location or orientation on the vehicle

 

So is this the same box that says not to change location or orientation on the vehicle?

 

ABS ECM located on the first cross member after tranny. Trace the ABS sensor wire from drive axle.
The one you found is ESP sensor for yaw and lateral G control. If your truck is not properly aligned this sensor will derate engine.

 

check your fuses you have two 15a fuses in the dash should be abs 1 and abs 2 check those first drivers sometimes like to take them out or some shops do it when they can't figure out the abs problems. abs ecu in yours should be in the dash most likely break off year for chassis ecu is 04 or 05 everything else should be dash mounted. behind radio and ac controler.