ABS and VSC TRAC lights flashing

[Hmebuildr]

This does not happen on a regular basis but on occasion when first starting the vehicle they do not flash in sync but a rapid vsc then abs

1) if I do not start the engine right away they will rapidly flash, key all the way on but has not engaged the starter.

2) I start the engine and they rapidly flash so I shut the engine off and restart they stop??

They never appear while driving just upon starting and not every time.

There are no codes showing on my scanner?

any ideas a search did not provide me with the info I am looking for

03 SR5 V8 76K on it

 

[CGuava]

Bringing this back up from the dead, but was there any solution to this? Mine has the exact same symptoms. No CEL, no VSC off light, rapid flashing. I have found that occasionally I can wiggle some wires above the brake pedal and it won't do it, all connections seem fine though. Seems like it's happening more often. Not sure if this is a zero point cal symptom or just a loose connection somewhere.

 

[ARunner]

Bumping this one... washed underneath my truck with a pressure washer and noticed this when I restarted it. I will say I have a spliced together abs/atrac wire on the front driver's side following a broken wire, compliments of the alignment shop. It's been working fine, however since the repair 6 months ago, including a couple of wheeling trips. I have a new one in the drawer, just haven't installed it. I might try swapping that out to see if by chance I got water on the connection. The lights are flashing really fast in an alternating fashion - Trac & ABS.

 

[ARunner]

Update. I went ahead and swapped my abs sensor wire out and turned on the key to find the flashing continued. I unplugged the battery for a few minutes. Turned on the key and it was gone. Started the engine for a few seconds and it was still off. Turned key back on a couple minutes later and it was back. Then it occurred to me that when I was repairing the initial broken wire, a similar situation arose where I could not get the truck to let go of the flashing lights.. Although at that time it was a different set of flashing lights. What the common denominator was/is is the fact I have a Scangauge 2 plugged in. And although it isn't storing any codes, it seems to if not cause, certainly agitate these issues when I'm trying to hunt them down. I unplugged the Scangauge. Then I turned the key back on. Flashy lights gone. Plugged the Scangauge back in. Noticed all data strangely was now absent in the Scangauge, but no blinky lights anymore. I think for me from here on, first thing I will do is unplug the Scangauge if/when this occurs. What was the original cause? No clue. I've since driven 50 miles with no return of the blinky lights.

 

[CGuava]

For future searches, I also noticed the issue was with my scan gauge. It happens occasionally, and if I unplug and replug my scan gauge it's gone. I don't drive it often, but I do this once every six months maybe. It must connect two pins of the OBD2 port when it's loose or something.