Found this, but not sure how much help it will be.

Car maintenance, car safety reports at Edmunds

Component Description:
15. ELECTRICAL SYSTEM Bulletin Number: 02035
Bulletin Date: DEC 2003

Vehicle: 2000 Honda Insight
Summary:
IMA (INTEGRATED MOTOR ASSIST) SYSTEM INDICATOR ON WITH DIAGNOSTIC TROUBLE CODE P1448 STORED IN THE MCM MEMORY. ( NHTSA ITEM NUMBER - 633561 )

 

I found those but sadly the nhtsa seems to lack details of any sort. I did find an obscure .pdf that refered P1448 to the dreaded(loved if you are in warrany) code of death. however one obscure statement does not prove anything. I will post tomorrow when I get whatever news I shall get.

 

I can't find anything about it, but it smack between P1447 (battery degradation) and P1449 (battery overheat), so it is likely to be an issue with the performance of the battery sub-modules and not an electrical problem.

Reset your IMA (pull the 4th fuse from the left on the bottom row by the driver left shin for 20 seconds) and see if it comes back eventually, and perhaps this time with a P1449 error also.

Don't despair. It's fixable.

 

I am certainly not in despair. As an electronics technician I know that almost anything can be repaired. I will reset if the dealer cant help (replace pack) with this code. It was hot out so I am sure that heat played a role here. Hopefully the dealer can at the very least tell me exactly what this code means so I can post it here for others to find.

 

Hi

Found it on a listing of codes I have
SAE DTC P1448 (63) Battery Module overheating
(IMA System Indicator Indication)

Hope this is of help

 

Sounds like one of the battery subpacks is dodgy. And battery needs sorting. I can help with this as I have two spares, but not for at least three weeks as I'm away on hols.
I offer the same sort of service in the UK that Ron of Hybrid-Battery-Repair offers in the US.

I suggest reset code and see if it re-appears to start with.

How is/was the battery performance before the code?

 

I've found the docs on the P1448 (63).

On a 2000-2004, a P1448 may light if the inlet duct (behind the seat) or the exhaust duct (the area around the spare tire) are blocked. If they are not blocked, then a battery fan test should be performed. If the fan works, the battery needs to be rebuilt.