No start, 4 codes flashing, stuck in reverse

[Chevy152]

Had a similar issue. Warmed sled and loaded it into back of truck. Drove 45 mins in pretty cold weather. Tried to start sled, but got reverse beeper and codes - no start. Found this thread. Flat ISC fuse (not the ISC relay) was not blown, but the act of pulling the fuse and reinstalling resolved the issue. Probably some condensation got to fuse contacts. Have since applied dielectric grease to all fuses and relays. Can duplicate the issue by simply pulling ISC fuse and trying to start

 

[Perrdog]

I also am having the exact same issues?keeps blowing ISC fuse,multiple codes,going to start looking for a bad wire ...somewhere!

 

[InRBigness]

Let us know what you find. Mine only did it once after a big landing off a road approach.

 

[mark wheaton]

I also am having the exact same issues?keeps blowing ISC fuse,multiple codes,going to start looking for a bad wire ...somewhere!

I know this is an old thread but did you find the problem