What causes fault code P0230?

• Most likely: Faulty fuel pump relay (internal coil failure) • Likely: Wiring issues (chafed insulation or corrosion in connectors) • Possible: Tripped inertia switch (fuel cut-off switch) • Rare: Faulty Engine Control Module (ECM) driver circuit

How do you fix fault code P0230?

STEP 1: Check fuel pump fuses and the fuel system relay. Inspect connections for oxidation. STEP 2: Use a multimeter to check for 12V at the relay socket control terminal with ignition on. Measure relay coil resistance (typically 40-100 Ohms). STEP 3: Perform an output state test with a scan tool to command the pump on. Check wiring continuity between the ECM and the relay terminal to rule out harness breaks. STEP 4: Replace the fuel pump relay if faulty. If wiring and relay are sound, the ECM driver may be defective.

Powertrain (Engine & Gearbox)Standard EOBD

P0230 - Fuel Pump Primary Circuit Malfunction

Q: What are the symptoms of fault code P0230?

• Check Engine Light (MIL) illuminated • Engine will not start (no fuel pressure) • Engine stalls intermittently during operation • No priming sound from fuel pump when ignition is turned on • Vehicle may enter Limp Mode

Last updated:1 February 2026

Related:Fuel Pump Relay, Engine Control Module (ECM), Drivstoffpumpe, Krocksensor (Inertia Switch), BSI/Junction Box

System

Powertrain (Engine & Gearbox)

Related Fault Codes

P0200

Injector Circuit Malfunction

P0201

Cylinder 1 Injector Circuit Open

P0202

Injector Circuit - Cylinder 2 - Malfunction

P0203

Injector Circuit - Cylinder 3

Technical Description

P0230 is set when the Engine Control Module (ECM) detects an electrical abnormality in the fuel pump relay control circuit (primary circuit). The pulse width modulated (PWM) or constant signal sent to the relay coil is monitored for proper voltage levels. If the ECM commands the fuel pump 'on' but detects an incorrect voltage state (open circuit, short to ground, or short to power), the code is stored. This disruption prevents the low-pressure fuel pump from operating correctly, impacting fuel delivery to the injection system.

Possible Causes

Faulty fuel pump relay (internal coil failure)

Wiring issues (chafed insulation or corrosion in connectors)

Tripped inertia switch (fuel cut-off switch)

Faulty Engine Control Module (ECM) driver circuit

Symptoms

Check Engine Light (MIL) illuminated

Engine will not start (no fuel pressure)

Engine stalls intermittently during operation

No priming sound from fuel pump when ignition is turned on

Vehicle may enter Limp Mode

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P0230 - Fuel Pump Primary Circuit Malfunction

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P0230 - Fuel Pump Primary Circuit Malfunction

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