P129D 2016 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 2016 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 2016 GMC Sierra Description
What are the Possible Causes of the DTC P129D 2016 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 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.
Code Tech Notes
2016-2018 Chevrolet Silverado 1500
2019 Chevrolet Silverado LD
Dead Battery / P1682 P129D P10E4 P2535 / Crank No Start
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What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P129D 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 P129D 2016 GMC Sierra Code
What does the OBDII code P129D mean for a 2016 GMC Sierra?
It indicates a low voltage issue in the Fuel Pump Driver Control Module's Ignition On/Start Switch Circuit.
What are common symptoms of code P129D in a 2016 GMC Sierra?
Symptoms may include difficulty starting, stalling, reduced engine performance, or a check engine light.
What causes code P129D to appear?
Common causes include wiring issues, a faulty Fuel Pump Driver Control Module, a weak battery, or issues with the ignition switch.
Can a weak battery cause P129D in a GMC Sierra?
Yes, insufficient voltage from a weak or failing battery can trigger this code.
How do I diagnose code P129D on my 2016 GMC Sierra?
Start by checking the battery voltage, inspecting wiring and connectors, and testing the Fuel Pump Driver Control Module.
Can I still drive my GMC Sierra with code P129D?
Driving with this code may lead to stalling or performance issues, so it's best to address it promptly.
How much does it cost to fix code P129D on a GMC Sierra?
Repair costs vary depending on the specific issue but can range from $100 for wiring repairs to $500 or more for module replacement.
Is the Fuel Pump Driver Control Module the most likely cause of code P129D?
While it is a common cause, the issue could also stem from wiring, connectors, or the ignition circuit.
Can clearing the code P129D fix the problem permanently?
Clearing the code will turn off the check engine light temporarily, but the underlying issue must be repaired to prevent the code from returning.
Should I take my GMC Sierra to a mechanic for code P129D?
If you're not experienced with electrical diagnostics or module repairs, it's recommended to seek professional assistance.
Discuss the causes and fixes for P129D 2016 GMC Sierra OBDII Code
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