Help, no start!

[Sparky8370]

I thought disconnecting the batteries was a big no-no if there was a problem, and that it made the ecm impossible to recover. Isn't there some sort of warning against it in the manual?

[Blacky]

The full flash "do not pull battery power" warning is for older style PCMs that completely erase their memory when being full flashed. The new style PCMs/ECMs retain some "sanity" even when being full flashed so that if power is disconnected during a full flash then they are 100% recoverable.

Just off the top of my head:

PCMs that you should never disconnect power from if a full flash fails:

• LS1 97/98
• LS1 99+
• LB7
• 4CylA
• 4CylB

PCM's that you can remove power from during a full flash:

• E38
• E40
• E67
• P12
• LLY
• ALLISON 5spd

We should make up a list of which type of PCM is in which category (GMPX Revised the list).

Regards
Paul

I thought disconnecting the batteries was a big no-no if there was a problem, and that it made the ecm impossible to recover. Isn't there some sort of warning against it in the manual?

[Sparky8370]

Thanks for that, because my pcm is on the no-no list. Just my luck I would have remembered reading this thread and un-plugged it. Actually, I would probably come crying to here before I did anything that drastic anyway.