P128C 2014 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 2014 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 2014 GMC Sierra Description
What are the Possible Causes of the DTC P128C 2014 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 2014 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 2014 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.
Need more information about the P128C 2014 GMC Sierra code?
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Frequently Asked Questions about P128C 2014 GMC Sierra Code
1. What does the OBDII code P128C mean on a 2014 GMC Sierra?
The P128C code indicates that the Fuel Rail Temperature Sensor 1 has an incorrect signal message counter, meaning the sensor's communication with the ECM is faulty or inconsistent.
2. What are the symptoms of the P128C code in a 2014 GMC Sierra?
Symptoms may include reduced engine performance, poor fuel efficiency, difficulty starting, or the check engine light being illuminated.
3. What causes the P128C code to appear on a 2014 GMC Sierra?
Common causes include a faulty fuel rail temperature sensor, damaged wiring or connectors, or issues with the ECM software.
4. Can I drive my 2014 GMC Sierra with a P128C code?
While the vehicle may still be drivable, it’s not recommended as it can lead to reduced performance, potential damage to engine components, or unsafe driving conditions.
5. How do I fix the P128C code on a 2014 GMC Sierra?
Repairs may involve inspecting and repairing damaged wiring or connectors, replacing the fuel rail temperature sensor, or reprogramming/refreshing the ECM software.
6. How much does it cost to fix the P128C code on a 2014 GMC Sierra?
The cost depends on the exact issue, but replacing the fuel rail temperature sensor usually costs $150–$300, including parts and labor. Wiring repairs or ECM reprogramming could vary.
7. Can a faulty fuel rail temperature sensor cause other problems?
Yes, a malfunctioning sensor can lead to incorrect fuel delivery, poor engine performance, and potential long-term engine damage if not addressed.
8. How can I diagnose the P128C code on my 2014 GMC Sierra?
Use an OBDII scanner to confirm the code, then inspect the fuel rail temperature sensor, wiring, and connectors for damage. Advanced diagnostics may require a multimeter or professional tools.
9. Does the P128C code require ECM replacement?
Not necessarily. ECM replacement is a last resort, as the issue is often resolved with sensor replacement, wiring repairs, or software updates.
10. Will clearing the P128C code fix the problem permanently?
Clearing the code may temporarily turn off the check engine light, but the issue will likely return unless the underlying problem is resolved.
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