GE Dishwasher Error Code AUTO & SPEED flash

The AUTO and SPEED lights flashing simultaneously on a GE dishwasher indicates a turbidity sensor fault. The turbidity sensor is an optical component that monitors water clarity during the wash cycle, allowing the Auto program to adjust cycle length, water temperature, and wash intensity based on how dirty the water is. When this sensor reports an uncertain or unreadable signal, the control board cannot reliably determine water soil levels and defaults to a high-turbidity assumption, meaning the machine will run as if the water is heavily soiled regardless of actual conditions.

The fault can stem from several sources. Contaminated or clogged filters restrict water flow past the sensor, reducing its ability to take accurate readings. Hard water deposits, grease buildup, or debris coating the sensor lens will scatter or block the optical beam, producing erratic output. A failing sensor can also send voltage signals outside the expected range, which the control board interprets as an error condition.

The wiring harness connecting the turbidity sensor to the main control board is another area to inspect. Corroded terminals, loose connectors, or damaged wiring can interrupt the signal path and trigger this fault code. The drain system should also be checked, since standing water or slow drainage can keep sediment suspended near the sensor, interfering with readings. Resolving the fault requires systematically working through water quality, filter condition, sensor cleanliness, drain performance, and wiring integrity.