Integrated Motor Assist (IMA) battery failures are not uncommon. The IMA battery will require replacement when it fails.
Resources for the Repair and Maintenance of your 2003 Honda Insight
2003 Honda Insight
2003 Honda Insight Problems
IMA computer software failures. Depending upon the computer it will have to be replaced or updated with a software update from Honda.
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A binding gas cap can cause the Check Engine Light to illuminate. Replacing the filler neck is needed for this repair.
The automatic transmission (CVT) can have a "shudder" due to a worn start clutch. Replacing the start clutch should correct this type of shudder condition.
2003 Honda Insight Questions and Answers
My engine clicks or ticks, especially upon startup. Usually when I get on the expressway it stops. Is it the oil sending unit or maybe the oil pump, and how much will this set me back?
It is almost impossible to move the gear selection lever! Honda wants $300 to change it! Plus the part about $135. I have access to a car lift.