P129D 2014 GMC Sierra Code - Fuel Pump Driver Control Module Ignition On/Start Switch Circuit Low Voltage
Quick Answer
The Fuel Pump Power Control Module monitors the ignition voltage circuit to determine if the voltage is within the normal operating range. Common causes include Faulty Fuel Pump Power Control Module, Fuel Pump Power Control Module harness is open or shorted, Fuel Pump Power Control Module 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
- P129D 2014 GMC Sierra indicates Fuel Pump Driver Control Module Ignition On/Start Switch Circuit Low Voltage.
- Common causes
- Common causes include Faulty Fuel Pump Power Control Module, Fuel Pump Power Control Module harness is open or shorted, Fuel Pump Power Control Module 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 P129D 2014 GMC Sierra Description
What are the Possible Causes of the DTC P129D 2014 GMC Sierra?
- Faulty Fuel Pump Power Control Module
- Fuel Pump Power Control Module harness is open or shorted
- Fuel Pump Power Control Module circuit poor electrical connection
How to Fix the DTC P129D 2014 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 P129D 2014 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 P129D 2014 GMC Sierra code?
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Frequently Asked Questions about P129D 2014 GMC Sierra Code
What does the OBDII code P129D mean on a 2014 GMC Sierra?
The P129D code indicates a low voltage issue in the Fuel Pump Driver Control Module Ignition On/Start Switch Circuit.
What are the common symptoms of a P129D code?
Symptoms may include difficulty starting the engine, reduced engine performance, or the engine not starting at all.
What causes the P129D code to appear?
Common causes include a faulty Fuel Pump Driver Control Module (FPCM), damaged wiring or connectors, a weak battery, or a faulty ignition switch.
Can a bad battery trigger the P129D code?
Yes, a weak or failing battery can cause insufficient voltage, which may lead to the P129D code.
How do I diagnose the P129D code?
Start by checking the battery voltage, inspecting the wiring and connectors for damage, and testing the Fuel Pump Driver Control Module.
Is the P129D code serious?
Yes, it can prevent the engine from starting or running properly, so it should be addressed promptly to ensure reliable vehicle operation.
Can I drive my 2014 GMC Sierra with a P129D code?
Driving with this code is not recommended as it can lead to starting issues or engine failure while driving.
How is the P129D code fixed?
Repairs may include replacing the Fuel Pump Driver Control Module, repairing damaged wiring or connectors, or addressing battery or ignition switch issues.
What tools are needed to fix the P129D code?
Basic tools include a multimeter for testing voltage, a diagnostic scanner for clearing codes, and potentially replacement parts like the FPCM or wiring.
Does the P129D code require professional repair?
If you’re not experienced with electrical diagnostics, it’s best to consult a professional mechanic to accurately diagnose and repair the issue.
Discuss the causes and fixes for P129D 2014 GMC Sierra OBDII Code
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