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I’m going to make this as detailed as possible because I’ve searched everywhere for an answer and I can’t find anything definitive. Most forum posts have multiple lights on or other symptoms.

I have a 2014 Tundra CM with 112k on the clock. 3” toytec lifthas been on for about a year now. No other mods.

Yesterday I was driving out of my neighborhood at about 15mph when the yellow TC/VCS (The one that looks like a skid) Light started flashing. While it was flashing I lost all throttleresponse for a short time just like you do when your tires are slipping. This was driving straight through the neighborhood on dry ground so no wheel spin was happening. It would briefly go away, but when I pressed the throttle and made it down shift it would set the light off again briefly. I pressed the TCS off button, to the right of the steering wheel (then pressed it again to turn TC back on), to see if I could just get it to reset and it quit acting funny. I couldn’t replicate it for the rest of the day no matter how hard I hammered the throttle. When I pressed the TC off button the red “auto LSD” light came on, not the skid image with the word “off” under it. (Is that normal?) I thought it should illuminate the skid image “off” light when the TC off button is pressed.

this morning when I was heading to work I went over a small hump turning right at a stop light (normal throttle press, nothing crazy) and I heard what sounded like the abs test clunk and the yellow TC light flashed briefly again. I didn’t lose any throttle that I noticed this time because it was so quick, and I couldn’t get it to activate again on the 35 minute trip (mixed stoplights and highway).

I’m looking for any suggestions for diagnosing the problem, or if anyone has had anything similar what all you checked in your investigation. TIA.

The attached photos are for reference regarding the lights I’m referring to. The red “auto LSD” is illuminated because I pressed the TC off button. The one that flashes is the top right box with the skid in it. The skid with “off” below it was never illuminated the last two days. I hope this makes sense.
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Might be as simple as needing a zero point calibration. Essentially recalibrating everything after an alignment as far as the traction control goes.
 

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I’ve read that in other posts, but I haven’t had an alignment or lift/tires put on recently. (Been about a year)
You still may well need a ZPC like @Powertechn2 said. You may also look in to a faulty wheel speed sensor. Intermittent or faulty readings will cause the traction control to go off.

To disable the traction control, you need to hold down the bottom by your knee for 3 seconds while at a stop. The AutoLSD will illuminate as soon as you push it, but wait afew seconds for the yellow Squiggly Road light to illuminate. Release the button, then hold it three more seconds and the AutoLSD will disengage and the TRAC Off light will illuminate along with the squiggly road.
 

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II am betting this is a wheel speed sensor or damaged wiring going to the sensor. Check the wheel sensors to make sure they are all clean and not packed with mud or something and look for any cracked or damaged wires going to the sensors. Those wires just run down the control arm and are not really protected much so they can get damaged by road debris or something kicked up into the wheel housing. And with the lift, you may be putting some strain on those wires when the suspension is fully extended. I would jack up the front end and just make sure those wires are not getting pulled with the suspension at full extension. Check the wire tension with the wheels in the middle, but also turned to both extremes because turning the wheels will take up some of the slack in the wire as well. If one of them gets tight turning to the right, that might be the one giving you issues.

If you don't find it, it will be much easier to diagnosis when it finally complete stops working, but that can take a long frustrating time to happen if it does not store a code and you can't duplicate it when they have the computers hooked up to it.

Good Luck. And let us know what you figure out!
 
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