Replaced 12v with new one now when i put it into gear it jerking then it tries to go it shuts off. Its like its trying to relearn or could this be the trans aux got code P0AC4 is there an order to how you install batterys

 

Forgot to say that it was revving all the way up when I crank it sometimes have to shut off and restart

 

"UPDATE" pulled out hybrid battery disconnect and unhooked 12v for about an hour hoping it would do some type of reset. Going into gear now but jerking and shutting off at this point new hybrid battery new 12v battery. I'm going to go out on a limb here and say Trans Aux pump really hope this works anyone has instructions on how to do the replacement

 

What happens when you put the shifter in M instead of D? When our Tahoe had a bad battery, it would sometimes shut off when trying to restart the engine from Auto-Start. When pressing on the accelerator too fast, the electric motor would begin to move the Tahoe and then try to start the engine, but the battery was weak so the engine startup would fail and it would just stall (engine off and would not move). Had to turn everything off for a bit. Had to slowly accelerate to not overwhelm the battery with trying to power the initial surge to move the Tahoe and start the engine at the same time. Once we got moving, it would start the engine fine.

Is the "new hybrid battery" new from GM, or where did you obtain this battery? Is it really "new" or a "refurbished" battery?

The P0AC4 code means "Hybrid Powertrain Control Module Requested MIL Illumination". There must be another code that tells you what the problem is that caused the HPCM to turn on the "Check Engine" light.

 

It will move in M but its in my driveway i can only go so far and the reverse is acting really crazy its been sitting do you think the hybrid battery is low should i try to drive it and so battery can charge and Battery came from Best Hybrid Batteries

 

Also when my hybrid battery first went bad I tried to send it in for recondition found Best Hybrid Batteries. Once they received my battery they informed me it was shot and I had to get a new one so the quoted me a price with core ended up being almost 3k. But when I received the battery it was my old battery with a best hybrid batteries sticker on it. I just assumed all internal was new but now I'm starting to feel like it could be bad I have warranty and have reached out waiting for reply. The more I read I'm starting to think battery cells may be bad anyone ever got a battery from this company

 

Pulled codes P0AB9,P07A9 any thoughts? Also anyone ever had transmission control module issues

 

DTC P0AB9 happens when the electric motor is cranking the engine and it fails to start, or it starts and then stalls.
Is the engine starting at all? If so, check if it is charging the hybrid battery by looking at the radio display.

DTC P07A9 is "Transmission Clutch 4 Stuck On". Clutch 4 is the 1-3 clutch. When was the last time you replaced the transmission oil and filters? THere are 2 filters in there. One for the transmission and the other filter is where the Aux Fluid pump sucks up oil to pump when the engine is not running.

 

You can only see it charge if you are driving and no i have never changed trans fluid are filters do you think it could help if so anyone ever did these repairs. And would that stop it from going into gear properly

 

Also I forgot to say that when I change gears from reverse to drive I can hear the Aux pump engaging as I switch gears and when I start it revs high in rpms I have to stop then restart to make it go back to normal.. had truck running when making this post and it started to rev just sitting