i have done a lot of searching on this topic and the only thing i could find about it was in the FSM.

C1207 - PNP switch circuit (P/R range)

C1234 - yawrate sensor or yawrate sensor circuit

My VSC and/or abs (both do this leading me to think is a problem with the wheel speed sensor) randomly kicks in at speeds generally above 30 mph
and stays on until i change my accelerator level. ( if it happens will im coasting, i apply gas and its gone or if it happens under throttle and i let off its gone.) and sometimes its completely random. eventually, the VSC OFF/TRAC OFF lights come on and the system is disabled. NO check engine light ever comes on. when i turn off the car the codes go away.

that particular systems sensors have taken a beating from me. i MIGHT had heated the wire on my front right wheel speed sensor while trying to loosen a stubborn bolt. when my ABS rarely acts up, it feels like its only on that front passenger wheel yet there are no codes telling me this. and i also recently took apart my interior a few times for various reasons and could have messed up either a yaw sensor or PNP switch.

none of these actions caused any of these things to happen right after the work i did. they all started slow and got worse. when i first lifted my truck(on possible torched that wire) the only time VSC when off was when i was taking an off ramp at 5-10 MPH over the recommended speed limited which i attributed to the lift.

sorry for the long winded description. i hope someone can help and if they cant, i will post my results when i have figured it out.

 

bumpski

 

this is driving me nuts! i refuse to go to the stealership. i am inspecting the pnp sensor and yaw rate sensor tomorrow. suggestions?

 

Have you done the Andymod? Maybe that's causing the lights to go on but no CEL. Also are you familiar with zero point skid calibration? VSC has been known to have quite a few problems and undesirable results even when running on road. My VSC was kicking in at random times (no lights though, just the flashing skidding vehicle picture) and I got the Zero Point Skid Calibration done at the dealer free of charge. If you really don't want to get the service done at the dealer at least go in and ask if they are familiar with the ZPSC - if they are, they are probably trustworthy enough to work on your truck. At least that's what I based my decision on lol. Good luck with finding the problem