P0232 critical

Fuel Pump Secondary Circuit High

The P0232 code means the vehicle's onboard diagnostic system has detected: Fuel Pump Secondary Circuit High. This is a critical severity code.

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Keep driving?: No -- stop driving
DIY difficulty: moderate
Estimated cost: $150 - $850 (parts and labor)

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Common Symptoms

Engine runs rough or misfires
Strong fuel smell from exhaust or engine bay
Check Engine Light illuminated
Fuel pressure higher than specification
Hard starting when engine is hot

Probable Causes (Ranked by Likelihood)

Short to power in fuel pump circuit wiring Very High
Fuel pump relay stuck closed (continuously powered) High
Faulty fuel pump drawing excessive current High
Damaged wiring harness near fuel tank Moderate
PCM fuel pump driver circuit shorted Low

Step-by-Step Diagnostic Procedure

Measure fuel pump current draw -- readings above 10 amps indicate excessive draw or a short circuit
Check if the fuel pump continues to run with the key off -- indicates a stuck relay or short to power
Test fuel pump relay by removing it and checking if the pump stops -- a stuck relay will keep the pump running
Inspect fuel pump wiring harness along the frame rail and near the tank for chafing or bare wires
Replace the fuel pump relay first if stuck; replace the fuel pump if current draw is excessive

Frequently Asked Questions

Can I drive with code P0232?

No. A high fuel pump circuit can mean the pump runs continuously or delivers excessive fuel pressure, which is a fire hazard. Have the vehicle inspected immediately.

Why is my fuel pump running with the key off?

This typically means the fuel pump relay is stuck in the closed position, continuously sending power to the pump. This is a fire risk and the relay should be removed or replaced immediately.

Can a short in the wiring cause P0232?

Yes. A wire that has chafed through its insulation and contacts a power source can bypass the relay and send continuous power to the fuel pump, triggering this code.