ABS and Brake light on with Troublecodes

[blown240]

I just bought an 04 Yukon XL. It has the ABS light, and the brake light on. I went and had it scanned and came up with these codes:


P0719
P0856
P1689


From my research I found this info:

P0719 - Brake Switch Circuit Low Input

Possible causes Faulty Brake Switch Brake Switch harness is open or shorted Brake Switch circuit poor electrical connection
P0856 - Traction Control Input Signal, P0856 means the traction control input signal is not functioning properly, possibly due to a faulty ON/OFF switch or defective connectors.


P1689 - Traction Control Delivered Torque Output Circuit Conditions. GMC Description With the engine speed over 500 rpm, T/C system has failed, engine runtime 20 seconds and no Delivered Torque Output signal were received.


So where do I start? The truck seems to drive totally fine, and there is no check engine light, just the ABS and Brake lights are on.

 

[H8 PVMT]

Were you able to figure anything out?

 

[drakon543]

kind of an old post pvmt however its typical for these codes to come up together when the abs wheel speed sensor goes out. if your having the same problems I would start there.