P128D 2015 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 2015 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 2015 GMC Sierra Description
What are the Possible Causes of the DTC P128D 2015 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 2015 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 2015 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 P128D 2015 GMC Sierra Code
1. What does the OBDII code P128D mean on a 2015 GMC Sierra?
The code P128D indicates an issue with the Fuel Rail Temperature Sensor 2, specifically that the signal message counter is incorrect or not aligning with expected values.
2. What are the symptoms of code P128D on a 2015 GMC Sierra?
Common symptoms include reduced engine performance, poor fuel economy, difficulty starting, and the Check Engine Light being illuminated.
3. What causes the P128D code to appear on a 2015 GMC Sierra?
Causes can include a faulty fuel rail temperature sensor, wiring or connector issues, a malfunctioning Engine Control Module (ECM), or software issues.
4. Can I drive my 2015 GMC Sierra with the P128D code?
While the truck may still be drivable, it's not recommended to ignore this code, as it can lead to reduced performance and potential engine damage over time.
5. How is the P128D code diagnosed on a 2015 GMC Sierra?
A technician will use a scan tool to check for related codes, inspect the fuel rail temperature sensor and wiring, and verify the sensor's signal against manufacturer specifications.
6. How do I fix the P128D code on my 2015 GMC Sierra?
Repairs may involve replacing the faulty fuel rail temperature sensor, repairing damaged wiring, updating the ECM software, or replacing the ECM if necessary.
7. How much does it cost to fix the P128D code on a 2015 GMC Sierra?
Repair costs vary but typically range from $150 to $400, depending on whether the sensor, wiring, or ECM needs replacement.
8. Can a bad fuel rail temperature sensor cause engine damage?
Yes, a faulty sensor can lead to incorrect fuel delivery, which may cause poor combustion, overheating, or long-term engine damage if not addressed.
9. How do I prevent the P128D code from returning?
Regular maintenance, inspecting wiring connections, and addressing any performance issues promptly can help prevent the code from reappearing.
10. Is the P128D code common on the 2015 GMC Sierra?
While not extremely common, this code can occur due to wear and tear or electrical issues in the fuel rail temperature sensor system.
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