GE Dishwasher Error Code AUTO & SPEED

The AUTO & SPEED error code on a GE dishwasher indicates a turbidity sensor fault. The turbidity sensor is responsible for measuring the cloudiness or particulate load of the wash water, which allows the Auto cycle to dynamically adjust wash time, water temperature, and rinse cycles based on how dirty the load actually is. When this sensor returns readings that the control board considers unreliable or out of range, the system defaults to assuming maximum turbidity, meaning it treats the water as heavily soiled regardless of actual conditions.

This fault typically surfaces during the Auto or Speed program because these cycles rely most heavily on real-time turbidity data to make wash decisions. If the sensor cannot provide trustworthy input, the control logic flags the fault rather than risk an incomplete wash. The underlying issue can be a physically contaminated sensor lens, a failed sensor component, wiring problems between the sensor and the control board, or conditions in the wash tub itself such as heavy soil load, grease buildup in the filter system, or poor water quality that pushes sensor readings beyond expected thresholds.

Diagnosing this fault requires checking multiple systems. Start with the drain system and filters, as clogged filters or standing water can produce abnormal turbidity readings. Inspect the sensor itself for grease or debris coating the optical window. Verify wiring continuity and connections at both the sensor and the control board. Water quality issues such as high mineral content or detergent residue can also interfere with accurate sensor operation and should be considered as part of the diagnostic process.