My truck has become possessed in the last couple of weeks. When it has been sitting in really rainy conditions (like overnight) the horn honks at about 2 second intervals when I put the truck in reverse. This lasts only about 5 minutes and the condition clears itself.

I remember in 2003 these trucks were recalled for dampness getting into the ECM and preventing the truck from shifting to 4th gear. I had that happen to mine and I had the ECM replaced 3 years ago.

Anyone else had this problem or have any suggestions????