P129D 2015 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 2015 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 2015 GMC Sierra Description
What are the Possible Causes of the DTC P129D 2015 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 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 P129D 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 P129D 2015 GMC Sierra Code
1. What does the OBDII code P129D mean for a 2015 GMC Sierra?
P129D indicates a problem with the Fuel Pump Driver Control Module (FPCM) related to low voltage in the ignition on/start switch circuit.
2. What are the common symptoms of the P129D code in a 2015 GMC Sierra?
Symptoms may include difficulty starting the engine, reduced fuel efficiency, stalling, or the engine failing to start.
3. What causes the P129D code to appear?
Common causes include faulty wiring or connectors in the ignition switch circuit, a failing Fuel Pump Driver Control Module, or a weak battery.
4. Can a low battery trigger the P129D code?
Yes, a low or failing battery can result in insufficient voltage to the ignition on/start switch circuit, triggering this code.
5. How do I diagnose the P129D code?
Start by checking the battery voltage, inspecting wiring and connectors for damage or corrosion, and testing the Fuel Pump Driver Control Module for proper operation.
6. Is the Fuel Pump Driver Control Module the only possible issue for the P129D code?
No, the issue could also stem from wiring problems, a weak battery, or a malfunctioning ignition switch.
7. Can I drive with the P129D code active on my 2015 GMC Sierra?
Driving with this code may result in poor performance or stalling. It’s recommended to address the issue promptly to avoid further damage.
8. How do I fix the P129D code on my 2015 GMC Sierra?
Repairs may include replacing the Fuel Pump Driver Control Module, repairing damaged wiring, or replacing the battery if it’s weak.
9. How much does it cost to fix the P129D code?
Repair costs vary depending on the cause, but replacing the Fuel Pump Driver Control Module can range from $300 to $500, excluding labor.
10. Do I need professional help to fix the P129D code?
While some issues like checking the battery or inspecting wiring can be done by DIYers, diagnosing and replacing the Fuel Pump Driver Control Module may require professional assistance.
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