1r09g to 1r09h update - Battery too low to program

[krzcooter]

I just updated my new unit to gm_can_gas 1r09h. It had 1r09g on it when I bought it. Now when I connect it to the truck it is saying Battery too low to program. Didn't do that with 1r09g. I am showing 12v with the engine off and it is almost a brand new battery. I started the engine and let it run for a few minutes. After that voltage is still showing 12v and it still says voltage too low to program. I guess I am gonna re-try flashing the 1r09h update again tonight. See if that fixes it.

[krzcooter]

Just ran the engine for 5 minutes and also added a voltage gauge to my monitor dashboard. Both my truck dash gauge and the trinity are showing right at 12v with the engine off. Still saying voltage too low to program. Just brought the trinity back inside. Getting ready to reflash GM_Can_Gas 1r09h. Hopefully this solves the problem.

[krzcooter]

Just did the update again. Still showing voltage too low to program. I guess I am gonna hook a charger up to the battery tomorrow and see if that works. I do not know why it is saying voltage too low to program. Even after messing with things for quite a while and draining the battery, I was still above 11.4 v. Even when I am showing 12v I am getting the error.

[dguth66]

Krzcooter have a look at the negative cable ground connector at engine block clean er up a bit and check for good connector / cable.
Also the negative battery clamp is made to crimp around the cable end but the open exposed end can allow some corrosion to sneak down the copper cable and cause higher resistance, actually cut mine away with dremel and replaced.

Are you getting DIC warning to restart the vehicle "low battery" ?

[krzcooter]

I got it working. This morning I flashed the original 1r09 rom to the trinity and then did the 1r09g incremental update. Plugged it in to my truck and it worked fine.

[Mike_Levy]

NEVER tune with a low battery. If you lose power during the tune, you will brick the PCM.

[krzcooter]

Yes, I know. But my battery was not low. I was showing both 12v on my truck dash and my trinity monitor dashboard and the battery is only a couple months old. Anyway, I got it working by flashing the original 1r09 rom and then flashing the incremental rom. Now it is working great.

[dguth66]

Good to hear