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DTC code page

P023F: Fuel Pump Secondary Circuit/Open

Quick answer: The secondary fuel-pump circuit is open or interrupted enough that commanded operation cannot be completed.

Drivers also search this fault as fuel pump secondary circuit open, P023F open fuel pump circuit, fuel pump circuit open.

Severity: high Family: powertrain Related paths: 16
Meaning

What P023F usually means

P023F is the open-circuit version of the secondary fuel-pump branch. It usually means the ECU or pump controller cannot complete the electrical path because of an open wire, unplugged connector, failed module path, or relay output that never reaches the load. This page is useful because it describes a cleaner electrical interruption than the generic primary-circuit code and often points straight toward a broken path rather than a vague pressure complaint.

Fast triage

Start here before chasing parts

  • Scan first: save freeze-frame and pending codes before clearing anything.
  • Confirm the complaint: compare the stored code with current drivability symptoms.
  • Use context: trims, live data, and related codes usually narrow the fault faster than guesswork.
  • Work simplest to hardest: leaks, connectors, maintenance items, and known patterns before expensive components.
Initial checks

What to check first

  • Check whether the pump ever primes at all before assuming a pressure-sensor problem.
  • Inspect connectors near the tank and any inline module before replacing major parts.
  • Look for recent service work or harness movement that could have opened the circuit.
Driving risk

Can you keep driving?

P023F can easily produce a no-start or stall. If the pump circuit is opening intermittently, the vehicle should be treated as unreliable until the path is repaired.

High urgency: If symptoms are active, reduce driving and diagnose quickly before secondary damage builds.
Likely causes

Common causes behind this code

  • Open wire in the pump feed or feedback path
  • Connector not seated fully at the pump, module, or fuse box
  • Failed relay output path creating an open downstream circuit
  • Fuel pump control module internal open
  • Terminal spread, water intrusion, or damage near the tank harness

Cause phrases often tied to this code: open circuit, broken wire, unplugged connector, failed control module, relay output open.

Diagnostic order

Suggested workflow

  1. Confirm whether the fault is hard or intermittent by checking for pump command versus actual operation.
  2. Continuity-test the secondary feed path from relay or controller to the pump-side circuit.
  3. Inspect connectors, terminals, and module pins for pullout, corrosion, or water intrusion.
  4. Check whether the pump runs when the circuit is bypass-tested safely according to the platform design.
  5. Verify fuel pressure and starting behavior after the open is repaired.
Avoid guesswork

Common mistakes

  • Blaming the pump before proving the circuit is physically intact.
  • Skipping connector inspection at the tank because the pump assembly is easier to name than the harness.
  • Treating P023F as identical to every other pump code instead of recognizing the open-circuit clue.
Repair path

Practical fix guidance

  • Repair the open feed, damaged connector, or failed controller output that prevents the pump circuit from completing.
  • If terminal damage is found, restore connector tension properly rather than forcing a new part into a loose cavity.
  • Retest for clean prime and stable rail pressure once the electrical path is restored.
Vehicle context

Affected brands in this MVP

Brand hubs help broaden internal linking now and can evolve into make-specific diagnostic notes later.

Aliases and common searches

English phrases tied to P023F

Useful when the driver knows the wording but not the exact DTC yet.

  • fuel pump secondary circuit open
  • P023F open fuel pump circuit
  • fuel pump circuit open
Related search intent

Queries this page can answer naturally

  • P023F code meaning
  • what does P023F mean
  • fuel pump secondary circuit open symptoms
FAQ

Quick questions about P023F

Is P023F basically an open wire code?

Often yes. It commonly means the pump-side circuit cannot be completed because of an open path or disconnected component.

Can P023F cause intermittent hard starts?

Yes. A connector or harness that opens only with heat or vibration can create exactly that pattern.

Should I replace the pressure sensor first for P023F?

No. P023F points first toward the pump electrical path, not toward a rail-pressure sensor story.