Gen 1, hill descent control fault, service advance trac, check brake system

[perry]

2012 SCREW just shy of 100 k miles, only mods are a Whipple with a Force tune, some Deavers and a rack of rigid lights. Out of the blue, while driving on road, the dash lit up like a Christmas tree with a Hill Descent Control Fault, Service Advance Trac, and Check Brake System. When checking for codes, there are none. There are no weird handling issues like antilock breaks activating etc. Immediately on start up it coughs up the hill descent fault and the service advance trac errors. Then after I move ~ 20-30’ in either forward or reverse it coughs up the check brake system. I’ve done a visual of the speed sensor connections on the front and rear, unplugged and plugged back in the front sensors, nothing notable to report. Third tail light is dry connections look brand new. About two weeks previous to the dash lighting up it did something strange in a parking lot. After reversing out of my parking spot, I shifted to drive and the tranny acted up. It was like it locked in a high gear, 4 th 5th or 6 th and would not kick down. I shifted to neutral, back to drive, no change. Drove approximately 100 yards to a stop sign at the exit of the parking lot were after the stop everything returned to normal. It’s never done anything like that in the past. The only other tranny related issue since new was a year or two ago, when attempting to aggressively pass, (full boost) on blacktop, instead of kicking down the tranny felt like it slipped or went to neutral for a split second. After getting out of the throttle then getting back into, it all issues went away.
I’m headed home from work tomorrow and have 2 weeks off to figure things out. I’ve a plan to start by checking Ohms on all four speed sensors as well as rotate the wheels to verify function of the speed sensor. Additionally I’ll check tranny fluid level just because. Then what? I thought I read a post where ford tech one said if a speed sensor fails it definitely will write a code, though some threads and some Google searches seem kind of gray on that. Is there any way it could be the lead frame, maybe one of the speed sensors on it and is there any way to test for that? Appreciate any suggestions. I’ve googled away some hours and don’t have much to show for it. Thanks in advance.

 

[The Car Stereo Company]

is most likely going to be electronic. wiring or computer related. double check the 3rd brake light and the wiring harness going into the transmission. that would be the first place i would check. those are the usual suspects. then from there, we can dive in further