P128C 2018 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 2018 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 2018 GMC Sierra Description
What are the Possible Causes of the DTC P128C 2018 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 2018 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 2018 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 2018 GMC Sierra Code
1. What does the OBDII code P128C mean on a 2018 GMC Sierra?
The code P128C indicates an issue with the Fuel Rail Temperature Sensor 1 Signal, specifically an incorrect message counter detected by the vehicle's powertrain control module (PCM).
2. What are the common symptoms of code P128C on a 2018 GMC Sierra?
Symptoms may include an illuminated check engine light, poor fuel economy, rough idling, reduced engine performance, or difficulty starting the engine.
3. What causes the P128C code to appear on a 2018 GMC Sierra?
The code can be caused by a faulty fuel rail temperature sensor, damaged wiring or connectors, a PCM software issue, or a communication error between the sensor and the PCM.
4. Can I drive my 2018 GMC Sierra with a P128C code?
Driving with this code is not recommended as it may lead to reduced engine performance and potential damage to other components if the issue persists.
5. How do I fix the P128C code on my 2018 GMC Sierra?
Repairs may include inspecting and repairing wiring or connectors, replacing the fuel rail temperature sensor, or reprogramming/updating the PCM.
6. How do I diagnose the P128C code on a 2018 GMC Sierra?
Diagnosis involves using a scan tool to read live data from the fuel rail temperature sensor, visually inspecting the sensor and wiring, and testing the sensor with a multimeter to confirm proper operation.
7. Is the fuel rail temperature sensor the same as the fuel pressure sensor?
No, the fuel rail temperature sensor measures the temperature of the fuel, while the fuel pressure sensor monitors the fuel pressure in the rail.
8. How much does it cost to repair a P128C code on a 2018 GMC Sierra?
Repair costs can vary but typically range from $150 to $400, depending on whether the issue is with the sensor, wiring, or PCM.
9. Can a faulty PCM cause the P128C code?
Yes, a malfunctioning PCM or outdated software can cause communication issues with the fuel rail temperature sensor, leading to the P128C code.
10. How can I prevent the P128C code from reoccurring?
Regular maintenance, ensuring connectors and wiring are in good condition, and keeping the PCM updated can help prevent this code from reoccurring.
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