CSbox03s

About a 1.5 weeks ago I went for a ride in my '03 986S and my "PSM off" light and the "ABS" light both came on together at the same time. I did not touch the "PSM" dash board switch to turn it off, but double checked the switch and nothing happened with the lights remaining on. I then pulled over about 5 minutes later and rebooted the car. The light went away for the next 2 hours of driving. During that time I turned PSM off and on without any issues or lights remaining on.

Anyhow, so last night I took it out for a spin to check on the issue. I started the car, let it warm up and no lights. However, about a minute later when I dropped the E brake the lights came on again. I rebooted, lights were off and then they came on about 5 minutes later and stayed on for the remainder of my 30 minute drive. The car drove fine and there were no diferences in the handling.

Any suggestions, comments, experience with the problem and/ or questions?

Thanks,
CSbox03s

stumpjumper

my first guess would be a bad wheel speed sensor, but you really need to check the code when the light is on

judd944

could be a late response from the ABS brake booster. I had that happen. I used the durametric software to reset the fault and my PSM came back on.

judd944

check this link
https://rennlist.com/forums/showthre...ght=PSM&page=2

CSbox03s

Problem solved . . . . .Bought a new brake light swtich, per input from cross post on 996 forums. Went to go replaace it and checked out procudure in shop manual. The first thing it says is to try resetting the plunger in the relay prior to swtiching out the switch. This is done by depressing the brake, pushing in the plunger and turning 90 degrees. It worked! Drove about 60 miles the next day without any lights coming on.

Thanks all for your help,
CSbox03s