Help Cannot flash 99 tahoe

[hquick]

Hey Doc...you've done the swap in the Z...why not swap to 0411 in the Hoe?

[Doc]

That's on the massive list of things to do. Someday she will be Super Hoe.

[hquick]

Yeah...the list just grows and grows huh!
You know it's about 2 hours work right?
Have you seen James.B's Tahoe?
Now that's a 'Super Hoe'.
http://www.pacificp.com/forum/viewtopic.php?t=5134
http://www.pacificp.com/forum/viewto...er=asc&start=0
http://www.pacificp.com/forum/viewto...ghlight=#36229

[Doc]

You know it's about 2 hours work right?

That's funny. I would like to be able to goto the bank and finance 2 hours for myself! Too busy tuning/fixing other peoples stuff.

[Boost]

I just had the same issue on my 99 Silverado (K1500, not GMT800) and I could not get it to take after 5 attempts....any idea what's causing this issue? I've had no issues reading them, just writing this one. Any help is appreciated. Thanks.

I just had this same problem today on a '99 with the square headlights.
What is causing this? It wouldn't start (start and die, like a security issue), so I reprogrammed the PCM with a Tech2, and then it started. I had the fuse pulled for the aftermarket radio, and have the latest of everything as of today.

[Rocketman69]

Sorry I never updated this....

What was causing my flash attempts to fail ended up being the ABS module. Unfortunately, on the 6th attempt, it started to write, then failed and put me in a situation similar to yours...the PCM would not accept a new flash because it had no idea what OS or VIN it contained....

Paul came up with a fix for the software and was able to send me the files to load into my laptop and fix the situation with the PCM not being recognized.

He viewed the error logs to find out that about 17 seconds into the write process, my ABS module decided to wake up and interrupt the transfer of data into the bus stream. After fixing the problem, I pulled the ABS fuse (as well as the fuse to my remote start) and attempted to reflash. This time it took without any problems. I have since reflashed it a handful of times without any problems, but I ALWAYS pull the ABS maxi-fuse from the box under the hood before I flash.

Hope this helps.....

[joecar]

Gib,

Thanks for the update.

That's good point: pull the ABS fuse, and the Radio and On-Star fuses.

[Boost]

Thanks! I will try that.