P128F on 2011-2016 Chevrolet Silverado — Fuel Rail Pressure Sensors 1 and 2 Signals - Message Counter Incorrect
1 vehicles · 1 makes · $5,000-$12,000 repair
Most Reported On
P128F is an OBD-II diagnostic trouble code meaning “Fuel Rail Pressure Sensors 1 and 2 Signals - Message Counter Incorrect.” Manufacturer-specific code. It is documented on GM vehicles (Chevrolet, GMC, Cadillac) across both direct-injection gasoline and Duramax diesel applications, and it also appears on PACCAR commercial engines listed as "engine rail pressure control - incorrect." The ECM compares the reported values and message counters from the two fuel rail pressure sensors and has determined the data is not arriving correctly or the two sensors disagree. Because the ECM can no longer trust its rail pressure reading, it typically falls back to reduced power. Expect rough running, hesitation, poor fuel economy, hard starting, or stalling. This code is most commonly reported on 2011-2016 Chevrolet Silverado, with repair costs ranging from $5,000 to $12,000.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
P128F does not use the standard P/B/C/U prefix. It may be a manufacturer-specific code, so verify that a scanner supports your exact year, model and module before buying.
FAQ
What does P128F mean?
P128F stands for "Fuel Rail Pressure Sensors 1 and 2 Signals - Message Counter Incorrect." Manufacturer-specific code. It is documented on GM vehicles (Chevrolet, GMC, Cadillac) across both direct-injection gasoline and Duramax diesel applications, and it also appears on PACCAR commercial engines listed as "engine rail pressure control - incorrect." The ECM compares the reported values and message counters from the two fuel rail pressure sensors and has determined the data is not arriving correctly or the two sensors disagree. Because the ECM can no longer trust its rail pressure reading, it typically falls back to reduced power. Expect rough running, hesitation, poor fuel economy, hard starting, or stalling.
What are the most common causes of P128F?
The most common causes of P128F are: Failed or drifting fuel rail pressure sensor (sensor 1 or sensor 2), Open, shorted, or chafed wiring in the fuel rail pressure sensor circuit, Poor connection or corrosion at a rail pressure sensor connector, Low actual rail pressure from a failing high-pressure fuel pump or restricted fuel filter, ECM/PCM fault or out-of-date software calibration. The specific cause varies by vehicle.
How much does it cost to fix P128F?
Repair costs for P128F range from $5,000 to $12,000, depending on the vehicle and root cause.
Which vehicles are affected by P128F?
Au7o has documented P128F across 1 vehicle models from 1 manufacturers: Chevrolet.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.