I’m getting a error code of m6506 “ECU power short to ground”. I’ve cleaned and tightened the battery terminals and checked the ground off the negative terminal. What should I do next to try and find my problem?
Update, we fixed the problem. We removed the negative battery terminal on the split that grounds to frame and cleaned it thoroughly with a wire brush, hit the contact point on the frame with a grinder to expose bare metal, and replaced the factory screw with a new bolt.