OBD-II code · Powertrain (generic)
P0231 Fuel Pump Secondary Circuit Low
The voltage on the secondary side of the fuel pump circuit is below the expected level when the pump is commanded on. Often caused by a failed pump motor, corroded ground, or wiring fault.
Is it safe to drive with P0231?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyFuel pump motor failed or worn
- PossiblePump ground point corroded
- Less likelyConnector pins corroded - high contact resistance
Symptoms
- Check engine light on
- Hard start, no start, or stalling under load
- Power loss especially at high load or rpm
- Possible long cranking time
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 1–4 h
- Emissions test
- Usually unaffected
- Parts involved
- Fuel Pump, Fuel Pump Wiring
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.