The computer can misinterpret a low battery voltage and can cause a false Check Engine (MIL) light to come on. Updating the PCM can correct this issue.Google+
Car Problem Reports
Honda Accord Computer may misinterpret low battery voltage and cause CEL
Honda Accord Problem
Exhaust & Emissions Affected: 2.4L 4 Cylinder
Average Mileage: 131,400 mi (130,000 mi - 132,800 mi)
Visitor, 2005 Honda Accord, 130,000 mi
Multiple CEL due to low battery voltage.