Bootloader timeout, NO bcc

[brianfromhawaii]

I am trying to read a 2003 chevy silverado 2500hd 6.6 duramax, when i try to read it it gives a boot loader timeout error, i have read that it is due to low voltage... i put 2 brandnew interstate batteries in the truck reading 12.6 volts with the engine in the run posistion, and it still throws the same errors... hell, ive even hooked up a battery charger and got it up to 13.5 volts, still the same problem

one thing i noticed is when i am reading the computer, the vin comes up fine, but the BCC is blank, no ???? like on my old 98 camaro, just blank...

i have scanned this thing with a snapon modis and cleared every code on it, i guess these trucks are known for having a few weird codes that dont throw a CEL, sily body codes and such i read are totally normal, anyhow, i cleared EVERY device one by one and tried again, same thing...

any ideas?

[Bill@HPTuners]

Likely a pcm or wiring issue in the vehicle then.

[brianfromhawaii]

my friend has owned this truck since he bought it new from the factory, has never done anything to it... are there any logs i can give you?

[Bill@HPTuners]

Try reading in low speed mode.

[brianfromhawaii]

we are talkin in email as well... ive already done low speed mode, you said to try a bench harness, but how do i program the tcm?

[Bill@HPTuners]

If you cannot read the pcm you will not be able to program the tcm.

[brianfromhawaii]

If you cannot read the pcm you will not be able to program the tcm.

if i bench read the pcm, and then do a write, how am i to ever get to the tcm? your saying i have to bench program the pcm, which makes sence, but then the tcm never gets touched...

[Bill@HPTuners]

Its unlikely that you'll be able to write to the pcm/tcm in vehicle if you are unable to read the pcm/tcm in the vehicle.

[brianfromhawaii]

Its unlikely that you'll be able to write to the pcm/tcm in vehicle if you are unable to read the pcm/tcm in the vehicle.

ugh. should i just replace the PCM?