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Anybody had any luck getting into the late '21 production Bosch ECU ????

sold out already ? get home from work and already gone.......so dissapointed

so I went to the junkyard and pulled an ECM out of a 2005. returned home and swapped it out with my 2004. I flashed it and everything works perfect. Guess my box just didn't want to cooperate.

I have a friend with EFILive that is coming by today. Apparently he knows how to fix it so we will see.

I'm working on a 2004 Silverado

ive tried every combination on the fan settings..no luck...im gonna have to pull the efans and put the mechanical fan back in or get another ECM from a 2005

I can go into the scanner and activate the fans, but they will not work even with the 05 Tahoe tune flashed into the Silverado

I'm having the same problem on my 2004 Silverado that I just converted to efans from a 2005. I have a 2005 Tahoe and I'm wondering if I can copy the OS from it and load it into my Silverado. still...

thanks. I completely overlooked that

new rookie here looking for numbers for a stock 5.3 in a 2004 Silverado 4x4 with mechanical fan. Any suggestions appreciated !