The automobile fault code P128B indicates a problem with the fuel system. When this code appears, the engine light or service engine soon warning light will turn on. The possible causes for this fault code include low or no fuel, a faulty fuel rail pressure (FRP) sensor, an open or shorted fuel rail pressure harness, a poor electrical connection in the fuel rail pressure circuit, or a faulty fuel pump.

To fix this issue, you should visually inspect the wiring harness and connectors, checking for any damage or corrosion. Additionally, look for any broken, bent, pushed out, or corroded connector pins.

The repair time for this issue is estimated to be around 1.0 hour.

Repair Importance Level10.0 (Out of 10)
Estimated Repair TimeApproximately 1.0 hour
Repair Difficulty Level10.0 (Out of 10)

When the engine light is on or the service engine soon warning light is illuminated, it could be a sign of the p128b fault code.

  • The symptoms of the automobile fault code P128B include the Engine Light being ON or the Service Engine Soon Warning Light being illuminated.

The automobile fault code P128B can be caused by low or no fuel, a faulty Fuel Rail Pressure (FRP) Sensor, an open or shorted Fuel Rail Pressure harness, a poor electrical connection in the Fuel Rail Pressure circuit, or a faulty Fuel Pump.

  • The fault code P128B can be caused by: low or no fuel, a faulty Fuel Rail Pressure (FRP) Sensor, an open or shorted Fuel Rail Pressure harness, a poor electrical connection in the Fuel Rail Pressure circuit, or a faulty Fuel Pump.

To fix fault code p128b, start by visually inspecting the wiring harness, connectors, and components for any damage or corrosion.

  • To fix the automobile fault code P128B, follow these steps: 1.
  • Check the possible causes mentioned above.
  • 2.
  • Visually inspect the wiring harness and connectors related to the fault code.
  • 3.
  • Look for any damaged components.
  • 4.
  • Check for broken, bent, pushed out, or corroded pins in the connectors.
  • The estimated repair time for this fix is 1.0 hour.

The factors influencing the cost of diagnosing and fixing the automobile fault code p128b are the estimated repair time of 1.0 hour and the typical auto repair shop charges between $75 and $150 per hour.

The P128B fault code refers to the Fuel Rail Pressure Sensor 2 Internal Performance.

This code is set when the Fuel Rail Pressure Sensor 2 exceeds a predefined threshold for more than 2.6 seconds.

The Engine Control Module (ECM) uses the Fuel Rail Pressure (FRP) sensor to maintain the ideal pressure in the high-pressure section of the fuel system. The fuel rail pressure sensor sends fuel pressure and temperature information to the ECM via serial data. When the fuel pressure is high, the signal voltage from the sensor is high, and when the fuel pressure is low, the signal voltage is low.

The ECM controls the fuel pressure regulator, which regulates the high-pressure fuel going to the fuel injector rails and injectors.

If the Fuel Rail Pressure Sensor 2 exceeds the predefined threshold for an extended period of time, the P128B fault code will be triggered. This indicates an issue with the internal performance of the sensor. It is important to address this issue promptly to ensure proper fuel system operation.

What are the possible causes for the automobile fault code P128B?

If you’re seeing the P128B fault code on your automobile, it could be due to a few different causes. One possibility is that you have low or no fuel, which can trigger the engine light to come on. Another potential cause is a faulty Fuel Rail Pressure (FRP) sensor. It’s also worth checking the fuel rail pressure harness for any open or shorted circuits, as well as poor electrical connections. Lastly, a faulty fuel pump could be to blame. To fix the issue, start by visually inspecting the wiring harness and connectors. Look for any damaged components and check for broken, bent, pushed out, or corroded connector pins.

How can I visually inspect the wiring harness and connectors to fix the P128B fault code?

To fix the P128B fault code, start by visually inspecting the wiring harness and connectors. Look for any damaged components and check if there are any broken, bent, pushed out, or corroded pins in the connectors. This can help identify any issues with the fuel rail pressure sensor or fuel pump, as well as any open or shorted circuits or poor electrical connections. Don’t forget to check for low or no fuel as a possible cause as well.

What should I look for when checking for damaged components or corroded connector pins to resolve the P128B fault code?

When resolving the P128B fault code, start by checking for damaged components or corroded connector pins. This can be done by visually inspecting the related wiring harness and connectors. Look for any broken, bent, pushed out, or corroded pins. By doing so, you can identify any issues that may be causing the fault code and take the necessary steps to fix them.

p128b error fault code explained

If your engine light is on and you suspect it’s due to low or no fuel, a faulty fuel rail pressure sensor, or issues with the fuel rail pressure circuit, here’s what you can do. First, visually inspect the wiring harness and connectors for any damage.

Check for broken, bent, pushed out, or corroded pins on the connectors.

This will help you identify and fix the problem.

Scroll to Top