P128D 2018 GMC Sierra Code - Fuel Rail Temperature Sensor 2 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 2, Fuel Rail Temperature Sensor 2 harness is open or shorted, Fuel Rail Temperature Sensor 2 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
- P128D 2018 GMC Sierra indicates Fuel Rail Temperature Sensor 2 Signal Message Counter Incorrect.
- Common causes
- Common causes include Faulty Fuel Rail Temperature Sensor 2, Fuel Rail Temperature Sensor 2 harness is open or shorted, Fuel Rail Temperature Sensor 2 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 P128D 2018 GMC Sierra Description
What are the Possible Causes of the DTC P128D 2018 GMC Sierra?
- Faulty Fuel Rail Temperature Sensor 2
- Fuel Rail Temperature Sensor 2 harness is open or shorted
- Fuel Rail Temperature Sensor 2 circuit poor electrical connection
How to Fix the DTC P128D 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 P128D 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.
Need more information about the P128D 2018 GMC Sierra code?
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Frequently Asked Questions about P128D 2018 GMC Sierra Code
1. What does the OBDII code P128D mean on a 2018 GMC Sierra?
The P128D code indicates that the Fuel Rail Temperature Sensor 2 is providing an incorrect signal message counter, which is often related to communication or sensor issues.
2. What are the common symptoms of P128D on a 2018 GMC Sierra?
Symptoms may include a check engine light, reduced engine performance, poor fuel efficiency, or difficulty starting the engine.
3. What causes the P128D code to appear on a 2018 GMC Sierra?
Common causes include a faulty fuel rail temperature sensor, wiring or connector issues, or communication errors within the vehicle's control modules.
4. Can I drive my 2018 GMC Sierra with a P128D code?
Driving with this code is not recommended, as it can lead to poor engine performance and potential damage to the fuel system over time.
5. How do I diagnose the P128D code on a 2018 GMC Sierra?
Diagnosis involves scanning for additional codes, visually inspecting the sensor and wiring, and using a multimeter to test the sensor's electrical signals.
6. How can I fix the P128D code on my 2018 GMC Sierra?
Repairs may include replacing the fuel rail temperature sensor, repairing damaged wiring or connectors, or reprogramming the engine control module if necessary.
7. What tools are needed to fix the P128D code on a 2018 GMC Sierra?
You’ll need an OBDII scanner, a multimeter, and possibly basic hand tools to replace the sensor or repair wiring.
8. How much does it cost to repair a P128D code on a 2018 GMC Sierra?
Repair costs vary but typically range from $100 to $300, depending on whether the issue is a simple sensor replacement or involves more extensive wiring repairs.
9. Could a software update fix the P128D code on a 2018 GMC Sierra?
Yes, in some cases, a software update to the engine control module may resolve communication issues causing the P128D code.
10. Is the fuel rail temperature sensor 2 critical for engine operation?
Yes, it helps monitor fuel temperature to maintain proper engine performance, and its failure can negatively impact fuel efficiency and drivability.
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