Help! The weirdest thing started happening today...

[freewave]

Originally Posted by CTScott

OK. For that behavior the service manual points to the ECM, shift lock ECU (lives inside of the shifter) or the Park/Neutral switch (the switch that the shifter cable moves on the tranny) being the culprit. Diagnosis would best be done with the Toyota TechStream tool, as the data that it shows would allow one to narrow the problem down to one of those three devices.

I'm going to test the Park/Neutral safety switch myself in about an hour. From what I read, you can test by starting the vehicle, then unplugging the switch. From there I would see if the car stalls in neutral. If it doesn't, then I clean or replace the switch. Otherwise I move on to the next part.