P0233 Fuel Pump Secondary Circuit Intermittent

P0233 indicates an intermittent fault in the fuel pump secondary circuit. The pump output circuit drops out or becomes abnormal only at times.

Code status

Needs verification

Not yet verified against SAE J2012_202509 / J2012DA. Treat unverified rows as a lookup aid, not repair authority.

System: Fuel / Air
Scope: iso-sae-controlled-p0
Standard: SAE J2012 / ISO 15031-6
Source: legacy-import

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not clear an intermittent fuel pump circuit code without a loaded voltage and connector check.

Useful checks before replacing parts

Monitor pump voltage, fuel pressure, and command state while repeating the freeze-frame load and vibration conditions.
Inspect relay sockets, pump connector terminals, tank harness routing, grounds, and corrosion-prone connectors.
Check for intermittent stalling, hard start, or pressure drop events that match the circuit fault.

Related OBD-II codes

These nearby fuel / air entries can help compare wording and fault area. They may share the same verification status as the source database.