Hey all! this is my first post ever here... I've been dealing with an ever growing problem with my 2000 f350 xlt superduty v-10. its been really wet here lately and it started with the ABS lite and the air bag lite coming on along with the chime ringing 5 times in a row in a group of 5. The issue went away the day i brought it in for service with them telling me there was nothing wrong. Three days later (in the rain again), it happened again (same symptoms). This morning i drove away with the same issues and now with the speedo not working, the overdrive shift lite flashing, the service engine lite on, and also the passenger airbag "off" lite on when the truck is off, and i can also turn on the heat/ air conditioning on while the truck is off and no key is in the ignition. It's become pretty obvious to me that its moisture related, and i have the ability to fix it, but, I've just run out of other paths it could be originating from. HELP!!! Any suggestions would be extremely helpful... Thanks in advance...

 

You may have a windshield leak dripping or pooling into your PCM.