AdvanceTrac Intermittent - Advice?

[swamp2]

After using a lot of traction control (AdvanceTrac) off hooning around the Anza Borrego Desert yesterday, I've lost the ability to reliably turn it off (and on). Observations:

• Sometimes it will turn off after holding the button many times. Otherwise it's like the button is simply disconnected.
• Often a quick click followed by a press&hold can work to get AT off (of course factory correct behavior is just click and hold).
• Baja Mode reliably disables AdvanceTrac. Curiously, I can press the AT button while in Baja Mode and it says it's turned it on but the disabled icon remains illuminated. I suspect this is normal behavior and probably unrelated to the problem.
• No faults listed from my HPTuners dongle.
• Have had 2 recent brake related warnings pop up on my dash but they immediately went away and no brake functionality seems to have been affected.
• Brake pads and tires very worn but not into either indicators.
• And of course I was at about 18 psi for most of my trip, but back at street pressure now. Tire deflation has never caused this or anything related prior.
• Unplugging the battery for 15 minutes partially reset the UI (as it normally does) but didn't fix this issue.
• Rebooting ABS and BdyCM modules via FORScan didn't resolve.

Anything else I should try before getting bent over for electrical gremlins by a dealer?

My 650 crank hp tune with largely completely worn out tire along fast, loose Desert washes was so fun...

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[Brian_B]

I don't really have anything other than weird electrical crap is usually a sign the battery is dying. Even if the Bronco is running and has the alternator supporting it.

 

[swamp2]

I don't really have anything other than weird electrical crap is usually a sign the battery is dying. Even if the Bronco is running and has the alternator supporting it.

Thanks, not a bad guess. 3 years, 50k mi and in a very moderate climate seems a bit short lived.

Resting is 12.6 V and cranking drops to about 10.5 V. I can check more in FORScan, but these quickies seem to indicate it's OK.

 

[gwbigdog]

I like the battery suggestion or spend big $ and go to ford.

 

[Desmolicious]

Thanks, not a bad guess. 3 years, 50k mi and in a very moderate climate seems a bit short lived.

Resting is 12.6 V and cranking drops to about 10.5 V. I can check more in FORScan, but these quickies seem to indicate it's OK.

that is about it for modern batteries. I’d replace it anyway before you find yourself stranded.
in my recent experience I’ve had batteries only a few years old which test fine, then a day or so later useless.

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