P129F GMC Code - Fuel Pump Driver Control Module Fuel Pump Speed Signal Incorrect
Quick Answer
The Fuel Pump Driver Control Module sends reports of the actual fuel pump speed to the Engine Control Module (ECM) as serial data every 10 ms. Common causes include Faulty Fuel Pump and Level Sensor Assembly, Fuel Pump and Level Sensor Assembly harness is open or shorted, Fuel Pump and Level Sensor Assembly 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
- P129F GMC indicates Fuel Pump Driver Control Module Fuel Pump Speed Signal Incorrect.
- Common causes
- Common causes include Faulty Fuel Pump and Level Sensor Assembly, Fuel Pump and Level Sensor Assembly harness is open or shorted, Fuel Pump and Level Sensor Assembly 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 P129F GMC Description
the calibrated range for greater than 7 s.
What are the Possible Causes of the DTC P129F GMC?
- Faulty Fuel Pump and Level Sensor Assembly
- Fuel Pump and Level Sensor Assembly harness is open or shorted
- Fuel Pump and Level Sensor Assembly circuit poor electrical connection
- Faulty Fuel Pump Driver Control Module
How to Fix the DTC P129F GMC?
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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P129F GMC 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 P129F GMC Code
1. What are the common symptoms of OBDII code P129F in a GMC vehicle?
- Common symptoms include rough engine idle, poor acceleration, stalling, and the vehicle going into "limp mode."
2. What are the potential causes of OBDII code P129F in a GMC vehicle?
- The code P129F can be triggered by a faulty fuel pump driver control module, issues with the fuel pump speed signal, wiring problems, or a malfunctioning fuel pump.
3. How can I diagnose OBDII code P129F in my GMC vehicle?
- Diagnosis typically involves using a scan tool to read the code, checking the fuel pump driver control module, inspecting the wiring for damage, and testing the fuel pump speed signal.
4. Can I still drive my GMC vehicle with OBDII code P129F present?
- It is not recommended to drive the vehicle with code P129F present, as it can lead to poor engine performance and potential safety hazards.
5. How can I repair OBDII code P129F in my GMC vehicle?
- Repairing this code may involve replacing the fuel pump driver control module, repairing or replacing damaged wiring, or replacing the fuel pump if necessary.
6. Is it safe to reset the OBDII code P129F in my GMC vehicle using a scan tool?
- While resetting the code may temporarily turn off the check engine light, it is important to address the underlying issue causing the code to prevent further problems.
7. Will OBDII code P129F in a GMC vehicle affect fuel efficiency?
- Yes, code P129F can lead to decreased fuel efficiency due to improper fuel pump operation affecting the engine's performance.
8. Can a DIY enthusiast fix OBDII code P129F in a GMC vehicle?
- Depending on the root cause, some DIY enthusiasts may be able to address the issue by following repair guides and using the necessary tools.
9. How much does it cost to repair OBDII code P129F in a GMC vehicle at a repair shop?
- The cost of repairs for code P129F can vary based on the specific issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.
10. Are there any preventive measures to avoid OBDII code P129F in a GMC vehicle?
- Regular maintenance, such as checking the fuel system components, keeping the fuel pump clean, and addressing any fuel system issues promptly, can help prevent code P129F from occurring.
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