What Is P0230?
P0230 means the ECU has detected a fault in the fuel pump primary control circuit - the electrical circuit that commands the fuel pump relay to operate the fuel pump. The ECU monitors this circuit for correct operation, and when it detects an open circuit, short circuit, or missing feedback signal, P0230 is stored.
Without a functioning fuel pump circuit, the engine will not run or will stall immediately after startup. P0230 is a circuit fault - it does not necessarily mean the pump itself has failed. The most common causes are a blown fuel pump fuse, failed fuel pump relay, or a break in the wiring between the relay and pump. Always check the electrical supply before replacing the fuel pump itself.
Common Symptoms
- Engine will not start
- Engine starts but immediately stalls
- Engine management light on
- No fuel pump prime sound when ignition is turned on
- Loss of power leading to stalling while driving
Common Causes
OBD Fault Code Plain English Guide
- 100 most common UK fault codes in plain English
- A severity rating for every code so you know what can wait
- Causes and next steps listed for each fault
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How to Diagnose P0230
Check Fuel Pump Fuse
Locate the fuel pump fuse in the main fuse box (usually inside the engine bay fuse box - check the lid diagram). Test with a multimeter or test light. Replace if blown. If the new fuse blows immediately, there is a short circuit in the pump wiring that must be located.
Test Fuel Pump Relay
Locate the fuel pump relay. With the ignition on, check for 12V at the relay output terminal using a multimeter. Swap the relay with an identical spare relay from another circuit and retest. A faulty relay is a very common cause of P0230.
Listen for Pump Prime Sound
Turn the ignition to position II without cranking. A healthy fuel pump primes for 2–3 seconds - you will hear a faint hum from near the fuel tank. Silence confirms no power is reaching the pump.
Check Wiring from Relay to Tank
Trace the fuel pump supply wire from the relay output to the top of the fuel tank. Check for breaks, heat damage, or corrosion at the fuel sender connector on the tank top.
Test Pump Motor Directly
Apply 12V directly to the pump motor connector at the tank to confirm whether the motor itself is alive. If it runs on direct power but not through the relay circuit, the fault is in the wiring or relay, not the pump.
Mechanic's Corner - The Cut-Off Switch And The Tank-Top Connector
Before condemning any wiring, know whether your car has an inertia fuel cut-off switch. Fords in particular (Fiesta, Focus, Transit and friends) carry a small impact switch that kills the fuel pump circuit after a bump - and it does not need a real crash to trip. A kerb strike, a pothole hit hard, even slamming a tailgate has done it. The switch usually hides in a front footwell kick panel or behind boot trim, and resetting it is a ten second button press. A car that cranks with total fuel-pump silence after any kind of jolt gets the inertia switch checked before anything else - it is the only P0230 fix that costs nothing at all.
The other UK-specific serial offender is the connector on top of the fuel tank. It lives in the spray path of the rear wheels, marinating in road salt, and the pins corrode until the pump circuit goes high-resistance - which can show up as intermittent hot-day stalling months before the car ever refuses to start. If the pump runs on direct 12V but not through the loom, drop the tank guard or lift the rear seat access panel and inspect that connector before buying anything. Green pins mean you have found it. While you are testing, remember low system voltage mimics pump faults on some cars - a P0562 system voltage low code alongside P0230 puts the battery and charging system first in the queue, and a genuine dead-pump no-start with good wiring belongs to the P0087 low fuel pressure story instead.
Verdict
Check fuse and relay first - these are the most common causes and cost nothing to diagnose and pennies to fix. Only move on to wiring and pump testing if fuse and relay are confirmed good. Replacing a fuel pump without checking these first is a common expensive mistake.
