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Engine-Codes – GMC – P128D GMC

P128D GMC Code - Fuel Rail Temperature Sensor 2 Signal Message Counter Incorrect

Quick Answer

The P128D diagnostic trouble code for GMC vehicles specifically relates to the Fuel Rail Temperature Sensor 2 Signal Message Counter being incorrect. Common causes include Faulty fuel rail temperature sensor 2, Wiring issues or electrical connections related to the sensor, ECU malfunction or software glitches. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P128D GMC indicates Fuel Rail Temperature Sensor 2 Signal Message Counter Incorrect.
Common causes
Common causes include Faulty fuel rail temperature sensor 2, Wiring issues or electrical connections related to the sensor, ECU malfunction or software glitches.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code P128D GMC Description

The P128D diagnostic trouble code for GMC vehicles specifically relates to the Fuel Rail Temperature Sensor 2 Signal Message Counter being incorrect. This code indicates that the signal message counter from the fuel rail temperature sensor 2 is not within the expected range or has exceeded the threshold set by the vehicle's ECU (Engine Control Unit). The fuel rail temperature sensor plays a crucial role in monitoring the temperature of the fuel in the fuel rail to ensure optimal engine performance and fuel efficiency.

OBDII Code P128D GMC - Fuel Rail Temperature Sensor 2 Signal Message Counter Incorrect
P128D GMC Code - Fuel Rail Temperature Sensor 2 Signal Message Counter Incorrect

Common Causes of P128D GMC

  1. Faulty fuel rail temperature sensor 2
  2. Wiring issues or electrical connections related to the sensor
  3. ECU malfunction or software glitches
  4. Fuel system contamination or debris affecting sensor readings
  5. Extreme temperature fluctuations affecting sensor performance

Symptoms of P128D GMC

  1. Check engine light illuminated
  2. Decreased fuel efficiency
  3. Engine performance issues such as hesitation or rough idling
  4. Engine misfires
  5. Stalling or difficulty starting the engine

How to Fix P128D GMC

  1. Begin by connecting a diagnostic scanner to the vehicle's OBD-II port to retrieve the specific trouble code and confirm the issue.
  2. Inspect the wiring and electrical connections related to the fuel rail temperature sensor 2 for any signs of damage or corrosion. Repair or replace as necessary.
  3. Test the fuel rail temperature sensor 2 using a multimeter to ensure it is functioning correctly. Replace the sensor if it is found to be faulty.
  4. Clear the trouble code from the vehicle's ECU using the diagnostic scanner and perform a test drive to ensure the issue has been resolved.
  5. If the problem persists, further diagnostic testing may be required to pinpoint the exact cause, such as ECU testing or fuel system inspection.

Cost to Fix P128D GMC

The typical repair costs for addressing the P128D code on a GMC vehicle can range from $150 to $400, including parts and labor. However, it is essential to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Rates can range between $80 and $150 per hour at most auto repair shops, with rates potentially higher in metropolitan areas or at dealerships, while independent shops may charge less. It is advisable to inquire about local rates to obtain a more accurate estimate for this repair.

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Information for Specific GMC Models

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P128D GMC Code

1. What are the common symptoms of OBDII code P128D GMC?

- Common symptoms include poor engine performance, reduced fuel efficiency, rough idling, and illuminated Check Engine light.

2. What does the OBDII code P128D GMC indicate?

- This code indicates that the Fuel Rail Temperature Sensor 2 Signal Message Counter is reporting incorrect data.

3. What are the possible causes of OBDII code P128D GMC?

- Potential causes include a faulty fuel rail temperature sensor, wiring issues, ECM (Engine Control Module) problems, or sensor calibration errors.

4. How can I diagnose the OBDII code P128D GMC?

- Diagnosis involves using a scan tool to read the code, checking the sensor's wiring and connections, and testing the sensor's resistance and output voltage.

5. Can I drive my vehicle with the OBDII code P128D GMC?

- It is generally not recommended to drive the vehicle with this code present, as it can lead to poor engine performance and potential fuel system issues.

6. How can I repair the OBDII code P128D GMC?

- Repair options may include replacing the faulty fuel rail temperature sensor, repairing any damaged wiring, recalibrating the sensor, or resetting the ECM.

7. Is it safe to ignore the OBDII code P128D GMC?

- Ignoring this code can lead to further issues with your vehicle's fuel system and engine performance, so it is best to address it promptly.

8. Can a DIY enthusiast fix the OBDII code P128D GMC?

- Depending on your skill level and access to tools, you may be able to replace the sensor or check the wiring yourself, but more complex diagnostics may require professional help.

9. How much does it cost to repair the OBDII code P128D GMC?

- The cost of repair can vary depending on the exact cause of the code, but it may involve a sensor replacement, which can range from $100 to $300 including parts and labor.

10. How long does it take to fix the OBDII code P128D GMC?

- The repair time can vary based on the extent of the issue and the availability of parts, but it usually takes a few hours to a day to diagnose and repair the code.

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