P0232
Fuel Pump Secondary Circuit HighP0232 is a generic OBD-II powertrain diagnostic trouble code: Fuel Pump Secondary Circuit High. It is logged by the engine control unit when the powertrain monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.
What P0232 means
P0232 is set when the Powertrain Control Module (PCM) detects an unexpectedly high voltage on the fuel pump secondary (feedback) circuit. The secondary circuit is a feedback wire spliced into the high-current supply line between the fuel pump relay and the fuel pump (or Fuel Pump Driver Module, FPDM on Ford vehicles). Under normal operation the PCM uses this signal to confirm that the relay has de-energised and voltage to the pump has dropped to near zero after a commanded shutdown; a persistently high reading when the pump should be off indicates the relay has welded closed, a wiring short to battery voltage, or a failed FPDM holding the output line high.
Because the relay is stuck on or the circuit is shorted to 12 V, the fuel pump may run continuously regardless of PCM commands. This can lead to abnormally high fuel-rail pressure, rich running, flooding, and potential pump overheating, since the pump relies on a rest period and on the flowing fuel itself for cooling. The code is stored in the first drive cycle the fault is detected and the MIL is illuminated.
P0232 is closely related to P0230 (primary circuit fault) and P0231 (secondary circuit low). Always check for companion codes and inspect the relay, FPDM, and the full secondary circuit wiring harness before condemning any single component. Most repairs resolve around a faulty relay or a short in the feedback wiring rather than pump replacement.
Common causes
Most-frequently reported root causes when P0232 is logged.
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1
Fuel pump relay contacts welded closed, keeping the output circuit energised after PCM de-commands the pump.
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2
Short to battery voltage (B+) in the secondary feedback wiring between the relay and the PCM feedback input.
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3
Failed Fuel Pump Driver Module (FPDM) holding its output line high internally.
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4
Corroded or damaged connector pins creating a resistive path that reads above the PCM high-voltage threshold.
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5
Faulty PCM analog input for the feedback circuit (rare, diagnose after ruling out external faults).
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6
Incorrect relay installed with a different coil voltage rating causing improper switching.
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7
Chafed wiring contacting a chassis ground that back-feeds voltage through the circuit.
Symptoms drivers notice
How to diagnose P0232
A typical diagnostic flow when this code is present.
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1
Connect a scan tool, record freeze frame data, and note any companion codes (P0230, P0231, P0233).
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2
With the ignition off and the fuel pump relay removed, probe the secondary feedback circuit at the PCM connector for voltage — any reading above 0.5 V indicates a short to B+ in the harness.
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3
Inspect the relay socket terminals for corrosion, melting, or welded contacts; replace the relay and retest.
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4
If equipped with an FPDM, check the module output voltage with the relay removed; a high reading confirms a failed module.
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5
Perform a wiring harness inspection from the relay/FPDM to the PCM feedback pin, looking for chafing, heat damage, or contact with the battery cable.
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6
Clear codes, perform a key-cycle drive test, and verify the fault does not return before releasing the vehicle.
Related powertrain codes
Frequently asked questions
Can I still drive the car with P0232 active?
Short distances may be possible if the engine starts and runs, but driving is not recommended. A relay stuck on can overheat the fuel pump and cause pump failure, and in some cases leads to an excessively rich mixture that can foul catalysts or damage the engine.
What is the 'secondary' fuel pump circuit?
The secondary circuit is a low-current feedback wire that the PCM monitors to confirm actual voltage at the pump supply line. It is separate from the primary relay control circuit (P0230) and lets the PCM verify whether the pump is truly powered or not, regardless of what the relay coil command says.
Why is P0232 common on Ford vehicles?
Ford uses a dedicated Fuel Pump Driver Module (FPDM) that provides PWM-controlled power to the pump and a feedback signal to the PCM. When the FPDM fails internally it can hold its output high, triggering P0232. Ford also uses a separate inertia fuel shutoff switch that, if tripped and reset, can cause transient high-voltage readings.
Is P0232 the same as P0231?
No. P0231 is the companion 'low voltage' code — it fires when the PCM sees the pump circuit voltage drop below the expected minimum while the pump is commanded on. P0232 is the opposite condition: voltage above the expected maximum, usually because the circuit is shorted high or the relay cannot open.
Disabling P0232 in software
RaceTune can permanently disable P0232 — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.
Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.
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