July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Possible Causes

DTC is set when ECM detects an open or short in MAF meter circuit for more than 3 seconds with engine speed at 4000 RPM or less. If DTC P0100 exists, ECM will operate in fail-safe mode in which ignition timing is fixed at 10 degrees BTDC. Possible causes are:

MAF meter circuit is open and shorted.
Defective MAF meter.
Defective ECM.