P128C GMC Code - Fuel Rail Temperature Sensor 1 Signal Message Counter Incorrect
Quick Answer
The fuel rail pressure sensor transmits fuel pressure and temperature information by serial data. Common causes include Faulty Fuel Rail Temperature Sensor 1, Fuel Rail Temperature Sensor 1 harness is open or shorted, Fuel Rail Temperature Sensor 1 circuit poor electrical connection. 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
- P128C GMC indicates Fuel Rail Temperature Sensor 1 Signal Message Counter Incorrect.
- Common causes
- Common causes include Faulty Fuel Rail Temperature Sensor 1, Fuel Rail Temperature Sensor 1 harness is open or shorted, Fuel Rail Temperature Sensor 1 circuit poor electrical connection.
- 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.
Code P128C GMC Description
What are the Possible Causes of the DTC P128C GMC?
- Faulty Fuel Rail Temperature Sensor 1
- Fuel Rail Temperature Sensor 1 harness is open or shorted
- Fuel Rail Temperature Sensor 1 circuit poor electrical connection
How to Fix the DTC P128C GMC?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P128C GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Information for Specific GMC Models
- P128C 2014 GMC Sierra — Fuel Rail Temperature Sensor 1 Signal Message Counter Incorrect
- P128C 2015 GMC Sierra — Fuel Rail Temperature Sensor 1 Signal Message Counter Incorrect
- P128C 2016 GMC Sierra — Fuel Rail Temperature Sensor 1 Signal Message Counter Incorrect
- P128C 2017 GMC Sierra — Fuel Rail Temperature Sensor 1 Signal Message Counter Incorrect
- P128C 2018 GMC Sierra — Fuel Rail Temperature Sensor 1 Signal Message Counter Incorrect
Frequently Asked Questions about P128C GMC Code
1. What are the common symptoms of OBDII code P128C in a GMC vehicle?
- Common symptoms of code P128C may include poor engine performance, reduced fuel efficiency, and the illumination of the Check Engine light on the dashboard.
2. What does the OBDII code P128C in a GMC indicate?
- Code P128C indicates that the Fuel Rail Temperature Sensor 1 Signal Message Counter is incorrect, suggesting a potential issue with the fuel rail temperature sensor.
3. What are possible causes of OBDII code P128C appearing in a GMC?
- The code P128C in a GMC can be triggered by a faulty fuel rail temperature sensor, wiring issues, sensor calibration problems, or issues with the Engine Control Module (ECM).
4. How can I diagnose the cause of OBDII code P128C in my GMC?
- To diagnose the cause of code P128C, you can use an OBDII scanner to read the code and inspect the fuel rail temperature sensor, check the sensor wiring for damage, and perform a sensor calibration if necessary.
5. Can I continue driving my GMC with OBDII code P128C present?
- It is not recommended to continue driving your GMC with code P128C present, as it can lead to potential engine performance issues and may cause further damage if left unresolved.
6. How can I repair OBDII code P128C in my GMC?
- Repairing code P128C involves addressing the root cause, which may include replacing the fuel rail temperature sensor, repairing any damaged wiring, or reprogramming the ECM as needed.
7. Is it possible to reset OBDII code P128C in a GMC without fixing the issue?
- While you can clear the code temporarily using an OBDII scanner, it is crucial to address the underlying problem causing code P128C to prevent it from reoccurring.
8. Are there any DIY tips for troubleshooting OBDII code P128C in a GMC?
- DIY tips for troubleshooting code P128C include checking the sensor connections, inspecting the sensor for any visible damage, and ensuring the sensor is properly calibrated.
9. How much does it typically cost to repair OBDII code P128C in a GMC?
- The cost of repairing code P128C can vary depending on the exact cause of the issue, but it may involve sensor replacement, wiring repairs, or ECM reprogramming, which can range from $100 to $500 or more.
10. Can a mechanic help me with diagnosing and repairing OBDII code P128C in my GMC?
- Yes, a qualified mechanic with experience in diagnosing and repairing OBDII codes can assist you in identifying the root cause of code P128C and performing the necessary repairs to resolve the issue.
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