P129F or P023F code, along with no start, stalling, no power on GM vehicles

GM service bulletin fix for P129F or P023F code, no start, stalling, no power on GM vehicles

GM has issued a service bulletin #PIP5964 to address a no start, stalling, rough idle, no acceleration, loss of power, erratic shifting, fuel gauge inoperative on the vehicles listed below. In addition to the symptoms, you may find P129F or P023F codes stored.

P129F Fuel Pump Power Control Module Fuel Pump Speed Signal Incorrect
P023F Code: Fuel Pump Secondary Circuit/Open

Cause of the P129F and P023F codes

GM has determined that an internal short in the K111 Fuel pump Driver Control Module (FPDCM) is the cause.

What is a Fuel Pump Driver Control Module?

In older vehicles, the electric fuel pump ran at full pressure

Typical GM Fuel Pump Driver Control Module

any time the engine was running. This wasted power and lowered fuel economy. A fuel pump driver control module (FPDCM) receives a digital message from the ECM of the desired fuel pressure. The FPDCM then uses a pulse width modulated AC voltage to to the 3 phase motor inside the fuel pump to achieve the desired fuel volume and pressure.

This method runs the pump at an efficient speed, providing only the volume and pressure needed at the moment.

Vehicles affected by service bulletin#PIP5964

Buick Enclave 2021-2023
Buick Encore 2021-2023
Buick Encore GX 2021-2023
Buick Envision 2021-2023
Cadillac Escalade 2021-2023
Cadillac XT4 2021-2023
Cadillac XT5 2021-2023
Cadillac XT6 2021-2023
Chevrolet Blazer 2021-2023
Chevrolet Camaro 2021-2023
Chevrolet Equinox 2022-2023
Chevrolet Express 2021-2023
Chevrolet Malibu 2021-2023
Chevrolet Silverado 1500 Limited (RPO J21, 12th VIN Digit = 4 or less) 2022
Chevrolet Silverado 1500 New (RPO J22, 12th VIN Digit = 5 or greater) 2022
Chevrolet Silverado 1500 2023
Chevrolet Tahoe 2021-2023
Chevrolet Traverse 2021-2023
GMC Acadia 2021-2023
GMC Savana 2021-2023
GMC Sierra 1500 Limited (RPO J21, 12th VIN Digit = 4 or less) 2022
GMC Sierra 1500 1500 New (RPO J22, 12th VIN Digit = 5 or greater) 2022
GMC Sierra 1500 2023
GMC Terrain 2021-2023
GMC Yukon 2021-2023

Updated Fuel Pump Driver Control Module Part Numbers

MODULE ASM-F/PMP PWR CONT 13554821
MODULE ASM-F/PMP PWR CONT 13554820

Warranty coverage code applies for this module. It is covered for 8 years/80,000 miles (U.S.) or 8 years/130,000 km (Canada).

©, 2024 Rick Muscoplat