Chevy Express: P0720 → OSS Circuit → Malfunction
P0720 is a generic OBD II trouble code, which means that it has the same meaning for your Chevy Express as it would any other vehicle. It indicates that your Express’s OSS (Output Shaft Speed Sensor) is reporting a malfunction. It’s typically caused by a bad OSS, or a wiring problem. The OSS works by … Read more