C4 Moderate Moderate DIY

GE Dishwasher C4 — Turbidity / Wash Pump Fault

GE Dishwasher · Error code C4

What C4 Means

C4 indicates the control could not verify proper water circulation or turbidity feedback during wash. The wash motor or turbidity sensor is suspect.

Symptoms

  • C4 mid-cycle
  • Dishes not cleaning
  • Quiet operation (pump not running)
  • Cycle stalls

Common Causes

1
Blocked spray arms or chopper

Glass shards or large food chunks bound the chopper/wash impeller.

2
Failed wash motor

Open winding, seized bearing, or failed start capacitor on the circulation pump.

3
Dirty turbidity sensor

Sensor lens fouled with food film, giving false readings.

4
Loose wiring at motor or sensor

Connector unseated in the sump area from prior service.

How to Fix It

  1. Remove lower rack, spray arms, and filter; clear chopper area of debris.
  2. Spin the wash impeller by hand — it should turn freely.
  3. Clean the turbidity sensor lens (small clear window in the sump) with a soft cloth and vinegar.
  4. Inspect harness connectors at the wash pump and sensor.
  5. If pump hums or is silent with proper voltage, replace the circulation/wash motor assembly.

Parts You May Need

If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.

Common replacement GE dishwasher circulation pump motor View on Amazon→ Common replacement GE dishwasher chopper assembly View on Amazon→

More GE Dishwasher Codes

1h 1h — Delay Start Active 888 888 — Display Self-Test / Demo C1 C1 Error — Slow Drain (Over 2 Minutes) C2 C2 Error — Drain Cycle Too Long (Over 7 Minutes) C5 C5 — Heater / Heat Fault C7 C7 — Water Temperature Sensor (Thermistor) Fault

All GE codes → All dishwasher codes →

Verified against manufacturer documentation: geappliances.com

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician.