P023F on Chevrolet: How to Diagnose & Fix
Fuel Pump Secondary Circuit/Open
1 Chevrolet model · 1 documented issue · $250-$600 repair
P023F on Chevrolet by model: symptoms, diagnosis and fix
GMT900 Silverados (and the late GMT800) mount the fuel pump control module / fuel-system control module on an exposed frame-rail bracket where it is constantly hit with road salt, water and debris. The module's connector and internals corrode, and the FPCM then fails to drive the in-tank pump — producing extended cranking, intermittent stalling, and ultimately a crank-but-no-start with no fuel pressure. Because the pump itself is often fine, owners frequently mis-diagnose and replace the in-tank pump first. A common, well-documented salt-belt failure with steady search demand.
Common Symptoms
- Crank but no start / engine won't fire
- Extended cranking before starting
- Intermittent stalling while driving
- No fuel-pump prime sound at key-on
- Loss of power / hesitation
- Fuel-system codes / pump not commanded on
How to Fix
Diagnose by checking for fuel-pump prime/pressure and FPCM communication and inspecting the frame-mounted module connector for corrosion. The fix is to replace the corroded fuel pump control module (a new programmed module is required; GMT900 OE 20759945 / later 13543038 family) and clean/repair the connector and grounds; relocating or sealing the connector helps prevent recurrence. Rule out blown fuse/relay and a genuinely failed in-tank pump first.
Sources for this issue (1)
P023F code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P023F mean on a Chevrolet?
P023F stands for "Fuel Pump Secondary Circuit/Open." The PCM detected an open or malfunction in the fuel pump secondary (power/high-side) circuit between the fuel pump control module and the fuel pump. This circuit supplies operating voltage to the pump. On Chevrolet it is documented across 1 model: Silverado.
What are the most common causes of P023F?
The most common causes of P023F are: Open or corroded wiring/connector in the secondary fuel pump circuit, Failed fuel pump, Failed fuel pump control (driver) module, Blown fuse or failed relay, PCM fault. The specific cause varies by vehicle.
How much does it cost to fix P023F on a Chevrolet?
Published repair estimates on Chevrolet range from $250 to $600 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.