P0231
High SeverityFuel Pump Secondary Circuit Low
Fuel System
What Does P0231 Mean?
The fuel pump feedback circuit is reading low. The ECM is not seeing proper fuel pump operation.
Common Fix
Replace fuel pump
Estimated Cost (DIY)
$100 - $300
Symptoms
- ⚠️Engine stalls at speed
- ⚠️Hard starting
- ⚠️Loss of power under load
- ⚠️Engine dies when hot
Common Causes
Failing fuel pumplikely
Corroded fuel pump connectorpossible
Damaged wiringpossible
Clogged fuel filterpossible
How to Diagnose P0231
- 1Test fuel pressure at rail
- 2Check fuel pump connector for corrosion
- 3Check for voltage drop in fuel pump circuit
- 4Replace fuel pump if pressure low
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Frequently Asked Questions
- Can a fuel pump die intermittently?
- Yes — fuel pumps often fail when hot. The car starts fine cold but stalls after warm-up. This is a common failure pattern.
- How long do fuel pumps last?
- Most fuel pumps last 100,000-150,000 miles. Running the tank below 1/4 regularly shortens pump life.