ABS Light and Traction control light

[Brother Lu]

Both of these have been coming on periodically. Lights are off after I turn the truck off and restart it. Sometimes for days,sometimes for minutes. Code is P 0504 Brake Switch A/B Correlation. Anybody had to deal with this before? What needs to be replaced?

 

[AsianTaco]

I had this issue a while back. It would trigger it sometimes when my ScanGauge was plugged in. A buddy of mine works at Toyota and cleared it. For a while we were trying to think what was going on and usually if those 2 lights are on they say its the ABS computer. Luckily it wasn't. So do you have anything plugged into the OBDII while driving around?

 

[Brother Lu]

I did some more homework and then decided to replace the brake switch. No codes since. Surprisingly inexpensive part from Toyota. Took a few minutes to change.