2005 hah - p0a7f, p0ac4, p0627, p0300 (05,01)
 

Hey guys!
I was hoping someone here might know what could possibly be the issue that could be causing all these codes!

I recently purchased a 2005 HAH with 152,000 miles. The previous owner told me that he replaced the hybrid battery either 1 or 2 years ago. During test drive nothing seemed wrong and guessing he cleared the codes that’s why none were showing.
The next day after I purchased it I was driving it and 8 codes randomly appeared:

(1/8) P0A7F - Hybrid Battery Pack Deterioration

(2/8) P0301 - Cylinder 1 Misfire

(3/8) P0305 - Cylinder 5 Misfire

(4/8) P0300 - Random Misfire

(5/8) P0AC4 - IMA System Malfunction

(6/8) P0627 - Fuel Pump Control (FPC) System Malfunction

(7/8) P0A7F - Hybrid Battery Pack Deterioration

(8/8) P0AC4 - IMA System Malfunction


The vehicle there isn’t any issues with it when I drive it, there isn’t any problem with acceleration like typically with cylinder misfire, it does seem like it’s eating more gas than it should, and on the dash where battery charge is shown it indicates that the battery charge dies pretty rapidly then it recharges pretty quickly as well.

If anyone could please give me any suggestions or advice I’d really appreciate it!!

Re: 2005 hah - p0a7f, p0ac4, p0627, p0300 (05,01)
 

P0A7F - replace hybrid battery
P0AC4 - IMA fault in IPU system, turn IMA light on - almost certainly due to the P0A7F.
P030X - Misfire - new plugs and/or coil packs - do not cheap out on these. Get the NGK or Denso long life Iridium plugs specified for your car. Only replace coil packs if plugs don't fix it.
P0627 - This code has 74 steps of diagnostics. May be caused by:

fuse
relay
break in wire
shorted wire
failed fuel pump control module
failed fuel pump
PCM problem - needs updating

Found complete manual here:

https://www.manualslib.com/download/...brid-2005.html