P023F on Cadillac: How to Diagnose & Fix
Fuel Pump Secondary Circuit/Open
1 Cadillac model · 1 documented issue · 1 critical
P023F on Cadillac by model: symptoms, diagnosis and fix
An internal short inside the K111 Fuel Pump Driver Control Module (FPDCM, also called the fuel pump power control module) can cause a cluster of drivability faults on 2021-2023 Cadillac XT6 vehicles. GM documented this first as preliminary information PIP5964 and then as service bulletin 24-NA-139, published July 2024, which replaces PIP5964D. The symptom set is broad and misleading: crank-but-no-start, stalling while driving, loss of power, rough idle, erratic shifting, and an inoperative or erratic fuel gauge, all with the check engine light on and multiple codes stored. Because the module drives fuel pump speed, technicians may chase a failing in-tank pump or a transmission concern before finding the module. The bulletin directs module replacement when P023F and/or P129F are set and diagnostics find no other cause. Owner reports of the failure exist on the Cadillac Owners Forum, including a 2021 XT6 Sport that would not start with P023F stored.
Common Symptoms
- Engine cranks but will not start
- Stalling while driving
- Loss of engine power / reduced power message
- Rough idle
- Erratic or delayed shifting
- Fuel gauge inoperative or reading erratically
- Check engine light on with multiple stored codes
How to Fix
Confirm the reported symptoms, check current and history codes, and complete the applicable diagnostic checks. Under bulletin 24-NA-139, replace the K111 module when P023F or P129F is present and the diagnostic process finds no other cause. Select the correct VIN-specific part and follow GM replacement/setup service information. The codes alone do not prove the module faulty. Ask the dealer to verify warranty eligibility before promising a free repair.
Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.
Sources for this issue (3)
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 Cadillac?
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 Cadillac it is documented across 1 model: XT6.
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 Cadillac?
Repair costs vary widely with the root cause and Cadillac model; each issue on this page carries its own estimate where one is published.
Looking for P023F on a different make?
View P023F across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.