Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
A factory service bulletin for the 2019-2020 Chevrolet Silverado 2500/3500 and GMC Sierra 2500/3500 recommends replacing the Fuel Pump Driver Control Module for vehicles with Loss of power, stalling, and the P129F engine code.
The cost of diagnosing the P129F GMC code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
The Fuel Pump Driver Control Module sends reports of the actual fuel pump speed to the Engine Control Module (ECM) as serial data every 10 ms. The ECM calculates the error between the commanded fuel pump speed and the fuel pump speed that was reported from the Fuel Pump Driver Control Module. A Diagnostic Trouble Code (DTC) will be set If the fuel pump speed is outside a calibrated threshold. The DTC will be set if the difference between the commanded fuel pump speed and actual fuel pump speed is outside a
the calibrated range for greater than 7 s.
Need more information on how to fix the P129F GMC code? Get Access to Factory Service Manuals
Get the P129F GMC code diagnosed by a professional: Find a repair shop in your area
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