P0230

What it means

P0230 is the generic code for a fault in the fuel pump primary circuit, which is the low-current control side that switches the fuel pump relay or drives the pump control module. The engine control unit sets it when the voltage or state it sees on that circuit does not match what it commanded, such as an open circuit, a short to earth or a short to supply. The exact circuit layout and monitoring method vary by model and engine.

Symptoms

• Engine cranks but does not start
• Intermittent stalling or cutting out while driving
• Long cranking before the engine fires
• Loss of power or hesitation under load
• Fuel pump not heard priming when ignition is switched on
• Engine warning light on

Possible causes

• Faulty fuel pump relay (worn contacts or failed coil)likely
• Blown fuel pump fuse or a fuse with a poor connectionlikely
• Wiring damage, chafing or corrosion in the relay control circuitlikely
• Corroded, loose or water-affected connectors at the relay, fuse box or engine control unitpossible
• Faulty inertia (fuel cut-off) switch tripped or failing, on models that have onepossible
• Failed fuel pump control module, on models that use onepossible
• Internal fault in the engine control unit driver circuitrare

How to diagnose

1. Read and record the freeze frame data and check for any other stored codes, especially fuel pressure, crank or power supply faults
2. Check battery condition and charging voltage, as low voltage can cause misleading circuit faults
3. With the ignition switched on, listen for the fuel pump priming and note whether the relay clicks
4. Inspect the fuel pump fuse and relay, plus their sockets, for heat damage, corrosion and poor terminal tension
5. Check the inertia switch, if fitted, and reset it only if there is no sign of a fuel leak or collision damage
6. Inspect the wiring and connectors between the relay, fuse box, pump control module (if fitted) and engine control unit for damage or moisture
7. Using the wiring diagram for the vehicle, test the relay control circuit for supply, earth and continuity, and check the relay itself
8. Command the pump on with a suitable scan function if available, and measure fuel pressure to confirm the pump runs when commanded

How to fix

• Replace the faulty fuel pump relay or blown fuse, after finding out why it failed
• Repair or replace damaged wiring in the primary control circuit
• Clean or replace corroded terminals and connectors and secure them properly
• Replace a faulty inertia switch or fuel pump control module as confirmed by testing
• Repair or replace the engine control unit only after all wiring and supply faults have been ruled out

Can I keep driving?

Nearby codes

• P022FGenericCharge Air Cooler Bypass Control B Circuit High
• P0231GenericFuel Pump Secondary Circuit Low