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Error code reference

GE Dishwasher Error Code Turbidity Sensor Low Signal

Turbidity sensor count is less than 50 in 3 seconds.

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Turbidity sensor count is less than 50 in 3 seconds.

First step from the service manual

Check turbidity sensor and wiring connections.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What Turbidity Sensor Low Signal means on a GE dishwasher

The Turbidity Sensor Low Signal error on a GE dishwasher triggers when the turbidity sensor registers a pulse count below 50 within a 3-second measurement window. The turbidity sensor is an optical component that measures water clarity by detecting how much light passes through the wash water. A healthy sensor returns count values that reflect the actual soil load in the water. When the count drops below the 50-count threshold, the control board interprets this as an abnormally weak or absent signal, indicating the sensor is not functioning within its expected parameters.

The most common cause of this error is a fault in the sensor itself or in the wiring harness that connects it to the control board. Corroded, loose, or broken connector pins can interrupt the signal path and cause the count to fall below the minimum threshold. The sensor lens can also become coated with grease, mineral deposits, or debris, which blocks the optical path and reduces the light transmission the sensor relies on to generate an accurate count.

In some cases the control board may be failing to correctly read or process the sensor output, though this is less common than sensor or wiring issues. Diagnosing this error should begin with a physical inspection of the turbidity sensor and all associated wiring connections, checking for visible damage, corrosion, or disconnected terminals. Cleaning the sensor lens is a low-cost first step before committing to component replacement.

Source: manufacturer service documentation.

Common causes of Turbidity Sensor Low Signal

  1. 01

    Dirty or fouled sensor lens

    Wiring / connection

    Grease, mineral scale, or food debris coating the sensor's optical lens can block the light path and cause the count to drop below 50. Cleaning the lens surface is the recommended first step.

  2. 02

    Loose or corroded wiring connections

    Wiring / connection

    A poor connection at the sensor connector or along the wiring harness can interrupt the signal before it reaches the control board. Inspect all terminals for corrosion, bent pins, or disconnected plugs.

  3. 03

    Faulty turbidity sensor

    Part replacement

    The optical components inside the sensor can fail, preventing it from generating a count above the minimum threshold even when conditions are normal. If cleaning and wiring checks do not resolve the error, sensor replacement is likely needed.

  4. 04

    Damaged wiring harness

    Part replacement

    Chafed, pinched, or broken wires between the sensor and the control board can cause a low or missing signal. A continuity test along the harness will reveal any breaks.

  5. 05

    Control board fault

    Part replacement

    If the sensor and wiring both test correctly, the control board may be failing to properly read the sensor output. This is the least common cause and is typically diagnosed after all other components are ruled out.

See the test procedure for each cause

Frequently asked questions about Turbidity Sensor Low Signal

What does Turbidity Sensor Low Signal mean on a GE dishwasher?
This error means the turbidity sensor, which monitors water clarity during the wash cycle, is returning a pulse count below 50 within a 3-second window. The control board interprets this as an abnormally weak or absent signal. The cause is usually a dirty sensor lens, a loose wiring connection, or a failed sensor.
Can I fix the Turbidity Sensor Low Signal error myself?
Some causes are DIY-friendly. Start by inspecting and cleaning the turbidity sensor lens to remove grease or mineral buildup, then check that all wiring connectors to the sensor are secure and free of corrosion. If the error persists after those steps, sensor replacement or further electrical diagnosis may require a technician.
Is it safe to keep using my GE dishwasher when this error appears?
The dishwasher may still run cycles, but without a functioning turbidity sensor it cannot accurately assess water soil levels or adjust wash performance accordingly. Dishes may not be cleaned or rinsed properly. It is best to address the error before continuing regular use.
How much does it cost to repair a Turbidity Sensor Low Signal error on a GE dishwasher?
If only cleaning the sensor lens resolves the issue, there is no parts cost. A replacement turbidity sensor typically ranges from about $20 to $60 in parts, with professional labor adding $75 to $150 depending on your area. If the control board is at fault, total repair costs can be significantly higher.
Will resetting my GE dishwasher clear the Turbidity Sensor Low Signal error?
A reset may temporarily clear the error code, but if the underlying problem with the sensor or wiring is not corrected, the error will return once the control board runs its diagnostics again. A reset is useful for confirming whether the fault is intermittent, but it is not a fix for a genuine sensor or wiring problem.

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