Help tried to write tune for first time. Failed now truck wont start or even connect

Hello,
Okay i just got hptuners. to tune my truck (2004 2500HD)

i connected to the truck using did the entirte process of downloading the stock tune file and saving it with VCM edditor. Then changed the idle stuff and tried to write the new tune in. When this was happening the process failed and when it failed it completly made it impossible for me to connect using the hptuners.

also now the truck does not start when i tried to start it. all the power comes on but no starter at all.

Things i have tried
re sync tuner
disconteccting vehicle battery
checking OBD fuse
charging battery fully
every combo imaginable in regards to the key on, plug in obd, plug into computer ect.

no change. When i try to read the vehicle i get a message of unable to connect to the vehicles diagnostics protocol.

Under the hood there is a radio and a radio amp fuse. Pull those. When writing uncheck the high speed box.

This year range trucks are very bad about being hard / slow to write. Sometimes letting them sit unplugged over night will bring them back. You should be able to hurt it but be mindful that you can.

^^^ I agree with Alvin. Those P59s are a PITA sometimes. A lot of times just unchecking the high speed box is enough to get them to write. Other times I've had to pull them out of the vehicle to recover them but afterwards just unchecking the high speed will allow you to do them in the vehicle.

My experience with this PCM has been the chip that holds the information has failed.

I sure apreaciate it guys,
I had to pull the radio fuse and also had to make sure the High speed write box was unclicked before it would write the tune. Its figured out. I spent the entire night reading and researching how to tune this truck. haha my eyeballs where bloodshot from all the studying. I think ive got the idle licked! Now onto tuning the rest!

Quote:

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Originally Posted by jaybuller

I think ive got the idle licked! Now onto tuning the rest!

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i follow this, VE then MAF, timing, then idle.
you cant tune idle until VE is near perfect.

Keep playing with it, we all learn our own ways of tuning, and as the old saying goes, there is more than 1 way to skin a cat...

I have to write my 2004 in low speed. Usually have to pull radio, radio amp, info fuses on 2003s or any with a aftermarket stereo and door chimes. Build you a bench harness to have on standby.