P128B GMC - Fuel Rail Pressure Sensor 2 Internal Performance

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What does this mean?

P128B GMC Possible Causes

  • Faulty Fuel Rail Pressure Sensor 2
  • Fuel Rail Pressure Sensor 2 harness is open or shorted
  • Fuel Rail Pressure Sensor 2 circuit poor electrical connection

How do I fix code P128B GMC

    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.

Cost of diagnosing the P128B GMC code

    Labor: 1.0

    The cost of diagnosing the P128B GMC code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

P128B GMC Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P128B GMC Meaning

The fuel rail pressure sensor transmits fuel pressure and temperature information by serial data. The fuel rail pressure sensor internal microprocessor allows 4 separate sensor outputs from one 3 wire sensor. The Engine Control Module (ECM) supplies the fuel rail pressure sensor with a 5 V reference circuit, a low reference circuit, and an asynchronous signal/serial data circuit. The asynchronous signal means communication is only going from the fuel rail pressure sensor to the ECM. The ECM decodes the serial data signal into separate voltages which are displayed on a scan tool as the voltage inputs from the Fuel Temperature Sensor, Fuel Rail Pressure Sensor and Fuel Rail Pressure Sensor 2.
OBDII Code P128B GMC - Fuel Rail Pressure Sensor 2 Internal Performance - Engine-Codes.com

P128B GMC More Information

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