P023F: Fuel Pump Secondary Circuit / Open
Severity: high
What it means: The engine computer sees an open or high-resistance fault in the fuel pump control circuit, so the pump may not get power. On many 2021-2023 GM vehicles, GM's bulletin PIP5964 lists P023F (with P129F) as a sign of an internal short in the K111 fuel pump driver control module.
Safe to drive? Not reliably. The engine can stall or fail to start. Have it towed if it's stalling.
Common symptoms
- Cranks but won't start
- Stalling or loss of power
- Fuel gauge erratic or reading empty
- Check engine light
Likely causes, ranked
- Failed fuel pump driver/control module (GM K111)Shop
- Open or corroded wiring or connector to the pumpShop
- Failed fuel pumpShop
- Blown fuse or bad relayDIY
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Vehicle-specific notes
- 2020–2023 Cadillac XT6: Owners with crank-no-start and P023F fixed it with a new fuel pump control module. GM PIP5964 covers 2021-2023 XT6 and many other GM models. Read the full answer · Source
DIY or shop?
Checking fuses and visible connectors is DIY. Module and pump diagnosis and replacement are usually shop work.
Before you replace parts
- Confirm there's fuel in the tank.
- Check the fuel pump fuses and relay.
- Read all codes. P129F with P023F points to the GM fuel pump driver module.
- Check your VIN for recalls and ask about GM PIP5964.
- Don't drop the fuel tank before checking the control module.
Safety / mechanic note
Verify with a mechanic. A stall in traffic is dangerous. Pull over safely if the engine sputters. A code points to a circuit or system, not always a specific part.
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