Faulty fuel pump relay or pump driver module giving a high or stuck signal; Open circuit or high resistance in the wiring, connector or earth on the pump control circuit; Corroded or loose connector terminals at the relay, fuse box or fuel pump; Short to voltage in the pump control wiring caused by chafed or damaged insulation; Failing fuel pump or in-tank wiring causing abnormal circuit voltage; Internal fault in the engine control unit output stage.

P0232

Fuel Pump Secondary Circuit High.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
2: AreaFuel and air metering (injector circuit)
32: FaultThe specific fault in that area

What it means

P0232 means the engine control unit has detected a high voltage in the secondary circuit of the fuel pump, which is typically the circuit that controls or feeds the pump relay or a second pump or driver stage. The control unit saw a voltage above the expected range when it was commanding the circuit on or off, so it set the code. The exact circuit layout and the conditions for setting the code vary by manufacturer and model.

Symptoms

Engine cranks but is hard to start or will not start
Engine stalls or cuts out intermittently
Loss of power or hesitation under load
Fuel pump not heard priming when the ignition is switched on
Engine warning light on

Possible causes

Faulty fuel pump relay or pump driver module giving a high or stuck signallikely
Open circuit or high resistance in the wiring, connector or earth on the pump control circuitlikely
Corroded or loose connector terminals at the relay, fuse box or fuel pumppossible
Short to voltage in the pump control wiring caused by chafed or damaged insulationpossible
Failing fuel pump or in-tank wiring causing abnormal circuit voltagepossible
Internal fault in the engine control unit output stagerare

How to diagnose

Read and record the freeze frame data and check for other stored fuel pump, fuel pressure or communication codes
Check the relevant fuses and the fuel pump relay for signs of heat damage, corrosion or poor contact
Inspect the wiring and connectors along the pump control circuit, at the fuel pump and at the control unit for chafing, water ingress and corrosion
Listen for the pump priming when the ignition is switched on and note whether it runs when it should
Using the wiring diagram for the vehicle, measure the supply voltage, control signal and earth at the relay and pump connector with the circuit on and off
Check for a short to voltage or an open circuit on the control wire with the connectors disconnected
Test the relay or pump driver module by swapping in a known good relay where the design allows, or by bench testing it
Check fuel pressure against the manufacturer's specification to confirm the pump is delivering correctly

How to fix

Replace a faulty fuel pump relay or pump driver module
Repair or replace damaged wiring and fix any short to voltage or open circuit
Clean or replace corroded connectors and terminals and restore good earth connections
Replace the fuel pump or its wiring assembly if testing shows it is faulty
Repair or replace the engine control unit only after all wiring and components have been proven good, and have it programmed as the manufacturer requires

Can I keep driving?

Medium severity

The car may run normally or may stall without warning if the pump supply is interrupted, so it should be fixed soon. Avoid driving it far, especially in traffic or on fast roads, until the fault is diagnosed.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.