P0232: Fuel pump secondary circuit: high signal
The ECU sees a voltage that is too high on the fuel pump’s secondary circuit, usually caused by a wiring fault, a sticking relay or a control module.
| Code | P0232 |
|---|---|
| System | Engine and transmission |
| Group | P02xx, Fuel and injectors |
| Type | Generic: it means the same on every make |
| Can you keep driving? | With care |
What P0232 means
The fuel pump sends fuel from the tank to the engine. Some cars use a second circuit to control it, for example to change its speed or to run a second pump, and exactly what that circuit does is up to each manufacturer. The ECU has measured a voltage on it that is higher than it should ever be, which almost always points to an electrical problem.
Most common causes
- Loose, corroded or damaged connector at the pump or its control module
- Chafed wire touching another wire that carries voltage
- Fuel pump relay sticking or faulty
- Faulty fuel pump control module, on cars that have one
- Internal fault in the pump itself
- Faulty engine ECU, which is rare
Symptoms
- Engine warning light on
- Hard starting or long cranking
- Hesitation or lack of power when accelerating
- On some cars the pump runs at full speed all the time and sounds louder
Can you drive with P0232?
With care You can usually keep driving, but the engine could run short of fuel and cut out. Get it checked soon and avoid long trips until then.
Open the bonnetthe in-depth explanation
How to check it
With the ignition on and the engine off, listen for the pump humming for a few seconds near the tank. If your reader shows live fuel pressure, note it at idle and under acceleration for the workshop.
How to read and clear P0232 with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P0232 with its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- P022E The intercooler bypass control B gives a lower signal than normal
- P022F The intercooler bypass control B gives a higher signal than normal
- P0230 Fuel pump primary circuit malfunction
- P0231 Fuel pump secondary circuit low
- P0233 The fuel pump relay circuit has an intermittent fault
- P0234 Turbocharger or supercharger A overboost
- P0235 Turbo boost pressure sensor A: circuit fault
- P0236 Turbo boost pressure sensor A: range or performance problem
- P0200 Injector circuit malfunction
- P0201 Injector circuit malfunction, cylinder 1
- P0202 Injector circuit malfunction, cylinder 2
- P0203 Injector circuit malfunction, cylinder 3
What does code P0232 mean?
The fuel pump sends fuel from the tank to the engine. Some cars use a second circuit to control it, for example to change its speed or to run a second pump, and exactly what that circuit does is up to each manufacturer. The ECU has measured a voltage on it that is higher than it should ever be, which almost always points to an electrical problem.
Can you drive with P0232?
You can usually keep driving, but the engine could run short of fuel and cut out. Get it checked soon and avoid long trips until then.
How do you clear P0232?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P0232 comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
