P0232
Fuel Pump Secondary Circuit High
If your code reader dashboard displays the generic DTC error code P0232, your vehicle is currently experiencing an active failure related to "Fuel Pump Secondary Circuit High". Proper system troubleshooting is required to safely clear this warning.
Driver's Summary
P0232 is triggered when the PCM detects an abnormal condition associated with fuel pump secondary circuit high. On the road, this usually shows up as fuel pump runs continuously even with key off, battery drain. You can typically drive short distances, but ignoring this code long-term will cause accelerated component wear and higher repair costs.
Symptoms
Fuel pump runs continuously even with key off, battery drain
Common Causes
- Fuel pump relay stuck closed
- Short to battery voltage in pump wiring
- Faulty PCM keeping pump on
How to Fix
- 1 Replace stuck fuel pump relay
- 2 Test and repair shorted wiring
- 3 Test and replace PCM
Technical Explanation
The PCM triggers P0232 after its internal monitoring routine detects that a specific circuit or sensor has exceeded its acceptable operating range. The PCM monitors crankshaft rotational velocity via the CKP sensor at a resolution of individual tooth gaps on the reluctor ring. A combustion event in each cylinder produces a measurable acceleration spike; its absence or weakness is flagged as a misfire event within a 200-revolution or 1000-revolution test window. Once confirmed, the code is stored as a permanent DTC and the MIL is activated. The freeze frame snapshot — recording RPM, load, coolant temperature, and fuel trim at fault detection — is also saved and is critical for accurate diagnosis.
Is It Safe to Drive?
You can drive short distances, but the symptoms — fuel pump runs continuously even with key off, battery drain — indicate the affected system is compromised. Leaving this unresolved will lead to progressively worse fuel economy and potential damage to components beyond the original fault.
Mechanic's Pro Tip
Module replacement should always be the last resort for P0232 after exhaustively verifying all power supply circuits, ground connections, and communication bus wiring. Use a wiring diagram to locate all fuses, relays, and ground points for the affected module, and measure voltage drop on each ground with the circuit loaded. A module "failure" is frequently a corroded ground eyelet or a weak battery causing brownout conditions — fix these first and you'll save hundreds of dollars on an unnecessary module replacement.
Relay: $20 - $40; Wiring repair: $100 - $200