P023F
Fuel Pump Secondary Circuit/Open
Fuel delivery
Generic OBD-II
High
What it means
P023F means the ECM has detected an open (broken) circuit in the fuel pump's secondary control wiring. If the circuit is open the pump can't be switched on, so the engine may crank without starting or stall and fail to restart. A blown fuse, broken wire, or failed relay in the pump control circuit is the typical cause.
High
Can I keep driving? Often not drivable — an open pump circuit can stop fuel delivery entirely, causing stalling or a no-start. Have it fixed before relying on the car.
Common symptoms
What you'll notice
- Check-engine light on
- Crank-but-no-start condition
- Sudden stalling
- Hard starting
Common causes
Most likely first
- Blown fuel-pump fuseLikely
- Open or broken wiring in the fuel-pump control circuitCommon
- Failed fuel-pump relayCommon
- Faulty fuel-pump (driver/control) moduleLess often
- Internal ECM fault (rare)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data, then check the fuel-pump fuse and replace if blown (and find why it blew).
- Inspect the pump control wiring and connectors for opens, corrosion, or backed-out pins.
- Test the fuel-pump relay and confirm it receives its control signal.
- Verify voltage reaches the pump when commanded on; repair the open in the circuit.
- Suspect the pump control module or ECM only after fuse, wiring, and relay are confirmed good.
FAQ
Quick answers
Is it safe to drive with P023F?+
No — an open pump circuit can cut fuel delivery and leave you stranded. Diagnose and repair it before depending on the vehicle.
Can I just clear P023F?+
Clearing won't restore fuel delivery. If the circuit is open the pump won't run, so the fault and the driveability problem return immediately.
Related codes
Often seen with P023F
Read & clear P023F yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX