P0230 on Mazda
Fuel Pump Primary Circuit Malfunction
P0230 on Mazda vehicles indicates fuel pump primary circuit malfunction. Au7o has documented this code across 3 Mazda models — most commonly on CX-5, CX-90, Mazda3. P0230 means the engine computer detected a fault in the fuel pump primary circuit — the control side that switches the fuel pump (or its relay) on and off. The PCM energizes this circuit to run the electric fuel pump that delivers fuel to the engine; if it sees voltage that is too high, too low, or out of expected range, it sets this code. Because the pump may not run correctly, the engine can crank without starting, stall, lose power, or hesitate. This is a circuit/control fault rather than a direct measurement of fuel pressure.
Common Causes of P0230
- •Faulty fuel pump relay
- •Damaged wiring or connectors in the fuel pump control circuit
- •Corroded or loose ground/power connection
- •Failed fuel pump or fuel pump driver module
- •Blown fuse or fusible link
- •Open or short in the primary control wiring
- •Faulty PCM driver output (rare)
P0230 on Mazda by Model
Mazda CX-5(1 issue)
- Defective Fuel Pump (Denso Recall)2019-2021
Low-pressure fuel pump impellers can deform, causing pump failure and engine stalling without warning. Part of massive global recall affecting 19+ million vehicles across multiple manufacturers.
Mazda CX-90(1 issue)
- Engine Stalling / Loss of Power (Recall Related)2024-2025
The CX-90 has been subject to multiple recalls for engine stalling. Issues include fuel pump control module software errors, turbocharger boost control faults, and engine control module (ECM) programming that can cause unexpected engine shutdown. NHTSA campaigns 24V-014 and 24V-228 address these issues. Engine stalling while driving presents a serious safety risk.
Mazda Mazda3(1 issue)
- 2018 Mazda3 Denso Low-Pressure Fuel Pump Impeller Cracks - Engine Stall (Recall 21V875)2018
The in-tank low-pressure fuel pump supplied by Denso used an impeller molded with too low a density; it absorbs fuel, swells, cracks and deforms, then binds against the pump housing. Fuel delivery drops off, the engine runs lean, hesitates and can stall outright - sometimes at speed - and often will not restart when hot. This is the same defective Denso pump batch that hit millions of vehicles across several brands. Mazda's campaign covering 2018 Mazda3 and other models is NHTSA 21V875000, roughly 121,000 vehicles, with owner letters mailed July 2022. Owners report a long crank, a rough idle and low fuel rail pressure codes before the pump quits entirely.
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View P0230 across all makes →Frequently Asked Questions
What does P0230 mean on Mazda?▼
P0230 stands for "Fuel Pump Primary Circuit Malfunction." P0230 means the engine computer detected a fault in the fuel pump primary circuit — the control side that switches the fuel pump (or its relay) on and off. The PCM energizes this circuit to run the electric fuel pump that delivers fuel to the engine; if it sees voltage that is too high, too low, or out of expected range, it sets this code. Because the pump may not run correctly, the engine can crank without starting, stall, lose power, or hesitate. This is a circuit/control fault rather than a direct measurement of fuel pressure. On Mazda specifically, this code is documented across 3 models.
What causes P0230 on Mazda vehicles?▼
Common causes on Mazda: Faulty fuel pump relay, Damaged wiring or connectors in the fuel pump control circuit, Corroded or loose ground/power connection, Failed fuel pump or fuel pump driver module, Blown fuse or fusible link. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0230 on a Mazda?▼
Repair costs vary widely depending on the root cause and specific Mazda model.
Which Mazda models have P0230 documented?▼
Au7o has documented P0230 on 3 Mazda models: CX-5, CX-90, Mazda3.