What to do if Autotrol Control Unit displays ERR 3?
- AalanbeardAug 21, 2025
If the Autotrol Control Unit displays ERR 3, it means the controller can't determine the camshaft's position and the camshaft should be rotating to find Home position. Wait two minutes for the controller to return to the Home position; an hourglass should flash on the display, indicating the motor is running. If the camshaft isn't turning, check the motor connection, wire harness connections, optical sensor, and motor gear engagement. If the camshaft turns for more than five minutes, verify the optical sensor and camshaft connections, and check for obstructions in the cam slots. If problems persist, replace the wire harness, motor, optical sensor, and controller in that order.