have your battery and charging system checked. a battery in poor condition or low state of charge will cause driveability problems.

Answered by hmac300 (expert)
17,848 answers provided

Had a van at work that would drop out of overdrive when the lights were turned on. I was not in charge of maintenance, but was puzzled what the relationship/cause was. It was a bad brake switch. The brake switch in that vehicle was mounted up on the brake pedal arm and was mechanical. It is in the circuit that kills the cruise control among other things (like maybe dropping to 3rd gear under constant braking). Your reported "problem" with the tail light seems to loosely support a similar scenario. The shop that identified the brake light switch still wanted to also replace the trans and I had to tell the clowns, try fixing the brake switch first and see if the problem persists (it fixed it, trans was fine). I don't know if they never made the connection between the transmission and the switch, they were fooled by some trans code or they were just service n'er do wells.

RocketmAAn
Mechanic wannabe.

Answered by RocketmAn
0 questions asked

Golgosky, have you identified the cause? What was the fix?
I have a 2000 ES300 with same problem.

Answered by tschangrx7
0 questions asked

I have the same issue and also have the Neutral Safety switch Engine code P1780. Are the two issues linked? Brand new battery. Any solutions?

Answered by chewee99.cg
0 questions asked