GE Dishwasher C12 Error Code

When C12 appears on a GE dishwasher, the control board has confirmed that water did not leave the machine within the programmed drain window. On GE GDT655SSJSS, GE GDF630PSMSS, and similar variants, the drain pump runs for a fixed interval—often three to seven minutes on washers and dishwashers—while a pressure switch or turbidity sensor verifies the tub or sump is empty. If water remains, the cycle stops to prevent spin with a full tub or overflow on the next fill.

Most C12 calls are resolved without parts: open valve under sink. Restricted drain paths mimic pump failure because the impeller spins against a blocked hose or filter. Document whether the pump hums audibly during the drain step; a humming pump with no water movement points to a clogged filter or kinked hose, while silence may indicate a failed pump motor or loose wiring at the harness.

After clearing blockages, run a short cycle and listen at the drain hose for steady water flow. If C12 returns on the next load with a clean filter and straight hose, measure resistance at the pump motor connector per the service manual for your model before ordering a replacement pump assembly.