P128D 2016 GMC Sierra Code - Fuel Rail Temperature Sensor 2 Signal Message Counter Incorrect
Quick Answer
The P128D diagnostic trouble code (DTC) for a 2016 GMC Sierra specifically relates to the Fuel Rail Temperature Sensor 2 Signal Message Counter Incorrect. Common causes include Faulty Fuel Rail Temperature Sensor: The sensor itself may be malfunctioning, providing incorrect readings to the engine control module, Wiring Issues: Damaged or corroded wiring connecting the sensor to the ECM can disrupt the signal message counter, ECM Malfunction: A problem with the engine control module can also cause incorrect signal message counter readings. 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 2016 GMC Sierra indicates Fuel Rail Temperature Sensor 2 Signal Message Counter Incorrect.
- Common causes
- Common causes include Faulty Fuel Rail Temperature Sensor: The sensor itself may be malfunctioning, providing incorrect readings to the engine control module, Wiring Issues: Damaged or corroded wiring connecting the sensor to the ECM can disrupt the signal message counter, ECM Malfunction: A problem with the engine control module can also cause incorrect signal message counter readings.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P128D 2016 GMC Sierra Description
The P128D diagnostic trouble code (DTC) for a 2016 GMC Sierra specifically relates to the Fuel Rail Temperature Sensor 2 Signal Message Counter Incorrect. This code indicates that the signal message counter for the fuel rail temperature sensor 2 is not within the expected range, which can lead to various issues with the vehicle's fuel system. The fuel rail temperature sensor is responsible for monitoring the temperature of the fuel in the fuel rail, which is crucial for the engine's performance and efficiency. When the signal message counter is incorrect, it can affect the fuel delivery and combustion process, leading to poor engine performance, decreased fuel efficiency, and potential long-term damage to the engine components.
Common Causes of P128D 2016 GMC Sierra
- Faulty Fuel Rail Temperature Sensor: The sensor itself may be malfunctioning, providing incorrect readings to the engine control module.
- Wiring Issues: Damaged or corroded wiring connecting the sensor to the ECM can disrupt the signal message counter.
- ECM Malfunction: A problem with the engine control module can also cause incorrect signal message counter readings.
- Fuel System Contamination: Contaminants in the fuel system can affect the sensor's accuracy in measuring fuel temperature.
- Environmental Factors: Extreme temperatures or exposure to harsh conditions can impact the sensor's performance over time.
Symptoms of P128D 2016 GMC Sierra
- Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the vehicle's dashboard.
- Decreased Fuel Efficiency: A faulty fuel rail temperature sensor can cause the engine to run rich or lean, resulting in decreased fuel efficiency.
- Rough Idle: The engine may experience rough idling or stalling due to incorrect fuel delivery.
- Engine Misfires: Incorrect fuel temperature readings can lead to engine misfires, affecting the vehicle's overall performance.
- Reduced Power: The engine may lack power or responsiveness when accelerating due to improper fuel delivery.
How to Fix P128D 2016 GMC Sierra
- Diagnose the Issue: Use a diagnostic scanner to retrieve the specific DTC and pinpoint the problem with the fuel rail temperature sensor 2.
- Inspect Sensor and Wiring: Check the sensor for any visible damage or signs of wear, and inspect the wiring for any faults or corrosion.
- Replace Sensor: If the sensor is faulty, replace it with a new one and ensure proper installation.
- Clear Codes: Clear the DTC from the ECM memory using the diagnostic scanner to reset the system.
- Test Drive: Take the vehicle for a test drive to ensure that the issue has been resolved and that the check engine light does not reappear.
Cost to Fix P128D 2016 GMC Sierra
The typical repair costs for addressing a P128D code on a 2016 GMC Sierra can vary depending on the specific cause of the issue and the cost of parts and labor. On average, replacing a fuel rail temperature sensor can range from $100 to $200, while labor costs can add another $100 to $200. Overall, the total repair cost for this issue may fall between $200 and $400. However, it's important to note that diagnosis time and labor rates at auto repair shops can fluctuate based on various factors, so it's recommended to inquire about local rates for a more accurate estimate.
Need more information about the P128D 2016 GMC Sierra code?
Need more information on how to fix the P128D 2016 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P128D 2016 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P128D 2016 GMC Sierra Code
1. What does the OBDII code P128D mean on a 2016 GMC Sierra?
The code P128D indicates an issue with the Fuel Rail Temperature Sensor 2, specifically that its signal message counter is incorrect or out of expected range.
2. What are the symptoms of the P128D code in a GMC Sierra?
Common symptoms include a check engine light, reduced engine performance, poor fuel efficiency, and potential stalling or hesitation during acceleration.
3. What causes the P128D code to appear?
The code can be triggered by a faulty fuel rail temperature sensor, damaged wiring or connectors, a malfunctioning ECM, or communication errors between the sensor and ECM.
4. Can I drive my 2016 GMC Sierra with the P128D code?
While the truck may still be drivable, it is not recommended as it could lead to further engine performance issues or damage.
5. How do I diagnose the P128D code?
Diagnosis involves checking the fuel rail temperature sensor’s wiring and connectors for damage, testing the sensor itself, and verifying the data being sent to the ECM.
6. How do I fix the P128D code on my 2016 GMC Sierra?
Repairs may include replacing the faulty fuel rail temperature sensor, repairing damaged wiring, or updating/replacing the ECM if necessary.
7. How much does it cost to repair a P128D code?
Repair costs can vary but typically range from $150 to $300 for parts and labor, depending on whether the sensor or wiring needs replacement.
8. Can a bad fuel rail temperature sensor cause engine damage?
Yes, a malfunctioning sensor can lead to incorrect fuel mixture calculations, potentially causing long-term engine damage if left unaddressed.
9. Will clearing the code fix the P128D issue?
Clearing the code may turn off the check engine light temporarily, but the underlying problem must be resolved to prevent the code from returning.
10. Is the P128D code specific to GMC Sierra trucks?
No, the P128D code can also appear in other GM vehicles with similar fuel systems, but the troubleshooting steps remain largely the same.
Discuss the causes and fixes for P128D 2016 GMC Sierra OBDII Code
Code P128D 2016 GMC Sierra comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.