Before you do anything else, have your battery checked at AUTO ZONE. If your battery is good, then try these steps that worked to fix my ENGINE MANAGEMENT SYSTEM PROBLEM. 1. Use a 10mm socket with ratchet to remove the GROUND screw where it attaches to the chassis. 2. Use a coarse sanding block to sand the paint off the chassis where contact is made with the GROUND connection. 3. Apply DIALECTRIC GREASE to the screw threads and metallic parts of the ground connection. 4. Use a 10mm socket and ratchet to remove the BLACK GROUND wire cable connection attached to your battery. 5. Use a WIRE BRUSH to scrape all oxidation off the battery connector and the battery post. 6. Apply DIALECTRIC GREASE to the metallic battery connector and battery ground post. 7. Reconnect the BLACK GROUND wire cable connection to the battery post. 8. Gentlemen, START YOUR ENGINES!!! If these steps worked, CONGRATULATIONS!!! If they didn't work, say 3- Hail Mary's. 1- Our Father 1-Glory Be to the Father, and keep searching for answers so God helps you find one. God Bless You.