P128D 2016 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 2016 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 2016 GMC Sierra Description
What are the Possible Causes of the DTC P128D 2016 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 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 P128D 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 P128D 2016 GMC Sierra Code
1. What does the OBDII code P128D mean on a 2016 GMC Sierra?
The code P128D indicates an issue with the Fuel Rail Temperature Sensor 2, specifically that its signal message counter is incorrect or out of expected range.
2. What are the symptoms of the P128D code in a GMC Sierra?
Common symptoms include a check engine light, reduced engine performance, poor fuel efficiency, and potential stalling or hesitation during acceleration.
3. What causes the P128D code to appear?
The code can be triggered by a faulty fuel rail temperature sensor, damaged wiring or connectors, a malfunctioning ECM, or communication errors between the sensor and ECM.
4. Can I drive my 2016 GMC Sierra with the P128D code?
While the truck may still be drivable, it is not recommended as it could lead to further engine performance issues or damage.
5. How do I diagnose the P128D code?
Diagnosis involves checking the fuel rail temperature sensor’s wiring and connectors for damage, testing the sensor itself, and verifying the data being sent to the ECM.
6. How do I fix the P128D code on my 2016 GMC Sierra?
Repairs may include replacing the faulty fuel rail temperature sensor, repairing damaged wiring, or updating/replacing the ECM if necessary.
7. How much does it cost to repair a P128D code?
Repair costs can vary but typically range from $150 to $300 for parts and labor, depending on whether the sensor or wiring needs replacement.
8. Can a bad fuel rail temperature sensor cause engine damage?
Yes, a malfunctioning sensor can lead to incorrect fuel mixture calculations, potentially causing long-term engine damage if left unaddressed.
9. Will clearing the code fix the P128D issue?
Clearing the code may turn off the check engine light temporarily, but the underlying problem must be resolved to prevent the code from returning.
10. Is the P128D code specific to GMC Sierra trucks?
No, the P128D code can also appear in other GM vehicles with similar fuel systems, but the troubleshooting steps remain largely the same.
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