I just bought a 2006 F-250 PSD and it has 45k on it. My ABS light just came on and I have it scheduled to go back to CarMax for repair. I will update everyone on the results and what codes were discovered. I did install an amateur radio system in the truck recently and added an amplifier that draws close to 100 amps. I noticed in the Tech bulletin (06-7-6***ABS LIGHT ON AND POSSIBLE DTCS C1175, C1236, P0500, P0503)

That a current draw may be showing a problem to the ABS system. "
C1175 AND C1236


If the vehicle has DTC C1236 AND C1175 in the ABS module, check the vehicle wiring per the C1175 procedure. If there is a hard or intermittent wiring fault, the current may at times be high or low causing a C1175. A wiring concern may also cause noise in the circuit that can be interpreted by the module as an erratic speed signal, which will set a the C1236."


So there we are, update to follow, I just thought other Amateur Radio guys would find this useful. Has anyone else ran into this? I did put 35x12.5 BFG Mud Terrains on it wonder it that would effect the ABS?