P0231 - Fuel Pump Secondary Circuit Low

Fuel pump secondary feedback circuit is reading low.

Code Overview

Fuel pump secondary feedback circuit is reading low.

Common Causes

• Low supply voltage
• High resistance in the circuit
• Weak pump
• Wiring issue

Diagnostic Steps

1. Load-test the battery and charging system
2. Check voltage drop across the pump feed and ground
3. Inspect relay and connector condition

Likely Repairs & Cost Guides

Use test results to confirm the fault before pricing the repair.

Related OBD Codes

Browse the closest code-family pages when the same fault pattern often shows up nearby.

Next Steps

Move from the code to a diagnosis path, then into repair pricing once the fault is confirmed.