I know some automobiles produce this or similar alerts separate from "check engine" lights. It has to do with some scheduled maintenance interval and involves a sequence of steps. Usually, you need to turn the ignition switch to the accessory position and manipulate the gas pedal and/or odometer button. Some that use the gas pedal call for 3 full depressions within 5 seconds. I don't know that car but there's a chance focusing on OBD codes is just a tail chasing game. Good luck. Maybe someone will know the secret reset sequence that auto repair shops have in their documentation.
Installed MSD 6AL Ignition Control and MSD Ignition Coil in 1991 GMC Sierra 5.7L engine. Engine starts easily, idles well, runs smooth but the light comes on immediately after starting and remains on.
Checked for OBD Diagnostic Trouble Codes but none are showing/registering; no flashes. Disconnected battery for two minutes to clear system. Restarted engine and light came back on and remained lit.
Spoke with MSD tech rep who stated he had no idea as to what the problem could be.
Owners manual states the "light" monitors operation of the emission control system and the vehicle needs to be serviced. But there are no Diagnostic Trouble Codes for reference.
Nearest GMC dealer is a five hour drive.
Appreciate advice on what to do, or where to start to correct this problem.