Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine CAVITATION Error Fix: Pump Cavitation

Pump makes loud rattling or grinding noise with reduced output — often caused by suction lift being too high, partially blocked suction strainer, or air leaks in the suction line creating vapor bubbles that collapse inside the pump

Medium severity2 fixes available✨ Free fix available

Quick Answer

Error CAVITATION on the Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine means: Pump Cavitation. The top-ranked community fix is “Lower Suction Lift and Replace Damaged Suction Hose” (medium difficulty, ~60 min, DIY cost: $20-$40). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · water pump

Content is based on manufacturer service documentation, community repair experience, and OEM technical bulletins. Always verify with your owner's manual.Learn about our editorial standards.

When to Call a Professional

While many water pump repairs can be done safely at home, consider hiring a qualified technician if:

The repair involves electrical wiring, gas lines, or refrigerant
You've tried the top-ranked fix and the error persists
You smell gas, see sparking, or notice water leaking
The repair requires specialized tools you don't have
Your appliance is still under manufacturer warranty

Average professional repair cost for this issue: $130-$200.

Other Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine Error Codes

CARBURETOR CLOGGED

Carburetor Clogged

2 fixes

ENGINE WONT START

Engine Will Not Start

Pump Leaking Water

Low Water Flow Output

2 fixes

RUN DRY DAMAGE

Pump Ran Without Water

2 fixes

SURGING

Engine Surges or Hunts

2 fixes

WONT PRIME

Pump Will Not Prime

2 fixes

People Also Ask About Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine Error CAVITATION

What does error code CAVITATION mean on a Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine?

Error code CAVITATION on the Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine means: Pump Cavitation. Pump makes loud rattling or grinding noise with reduced output — often caused by suction lift being too high, partially blocked suction strainer, or air leaks in the suction line creating vapor bubbles that collapse inside the pump

How do I fix error code CAVITATION on my Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine?

The most successful fix is "Lower Suction Lift and Replace Damaged Suction Hose" (medium difficulty, ~60 minutes). Estimated DIY cost: $20-$40. HomeMD has 2 community-ranked fixes for this error.

Is error code CAVITATION on a Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine serious?

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Can I fix Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine error CAVITATION myself?

Yes — the top-ranked community fix ("Lower Suction Lift and Replace Damaged Suction Hose") is rated medium difficulty and takes about 60 minutes. Tools needed: Tape measure, Utility knife, Pliers.

How much does it cost to repair Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine error CAVITATION?

DIY cost: $20-$40. Professional repair typically costs $130-$200. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine have?

The Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine has 7 other known error codes, including: CARBURETOR CLOGGED (Carburetor Clogged), ENGINE WONT START (Engine Will Not Start), LEAKING (Pump Leaking Water), LOW FLOW (Low Water Flow Output), RUN DRY DAMAGE (Pump Ran Without Water), and 2 more.

What other error codes does the Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine have?

The Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine has 7 other known error codes:

CARBURETOR CLOGGED — Carburetor Clogged (2 fixes)
ENGINE WONT START — Engine Will Not Start (2 fixes)
LEAKING — Pump Leaking Water (2 fixes)
LOW FLOW — Low Water Flow Output (2 fixes)
RUN DRY DAMAGE — Pump Ran Without Water (2 fixes)
SURGING — Engine Surges or Hunts (2 fixes)
WONT PRIME — Pump Will Not Prime (2 fixes)

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