P128C 2016 GMC Sierra 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 2016 GMC Sierra 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 2016 GMC Sierra Description
What are the Possible Causes of the DTC P128C 2016 GMC Sierra?
- 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 2016 GMC Sierra?
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 2016 GMC Sierra 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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Frequently Asked Questions about P128C 2016 GMC Sierra Code
1. What does the OBDII code P128C mean on a 2016 GMC Sierra?
P128C indicates that the Fuel Rail Temperature Sensor 1 signal message counter is incorrect, meaning the engine control module (ECM) is detecting an issue with the data communication from the sensor.
2. What are the common symptoms of code P128C in a 2016 GMC Sierra?
Symptoms may include poor engine performance, reduced fuel efficiency, difficulty starting, or the check engine light being illuminated.
3. What causes the P128C code to appear on a 2016 GMC Sierra?
Common causes include a faulty fuel rail temperature sensor, damaged or corroded wiring, a bad connector, or a malfunction in the ECM.
4. How can I diagnose the P128C code on my GMC Sierra?
Start by using a scan tool to confirm the code. Then inspect the fuel rail temperature sensor, its wiring, and connectors for damage, corrosion, or loose connections.
5. Can a bad fuel rail temperature sensor cause drivability issues?
Yes, a faulty fuel rail temperature sensor can lead to incorrect fuel delivery, causing drivability issues like rough idling, hesitation, or power loss.
6. Is it safe to drive with the P128C code on a 2016 GMC Sierra?
Driving with this code is not recommended, as it can lead to poor engine performance and potentially cause further damage.
7. How do I fix the P128C code on my 2016 GMC Sierra?
Repairs may include replacing the fuel rail temperature sensor, repairing or replacing damaged wiring or connectors, or, in rare cases, reprogramming or replacing the ECM.
8. How much does it cost to fix the P128C code on a GMC Sierra?
The cost will vary depending on the repair needed, but replacing the fuel rail temperature sensor typically costs between $100 and $300, including parts and labor.
9. Can a dirty fuel system trigger the P128C code?
A dirty fuel system is unlikely to directly trigger this code, but it can contribute to related performance issues. The root cause is typically related to the sensor or its communication.
10. Do I need special tools to troubleshoot the P128C code on a 2016 GMC Sierra?
A diagnostic scan tool is essential to confirm the code and monitor sensor data. A multimeter may also be needed to test wiring and connections.
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