P129D 2016 GMC Sierra Code - Fuel Pump Driver Control Module Ignition On/Start Switch Circuit Low Voltage
Quick Answer
The diagnostic trouble code P129D for a 2016 GMC Sierra indicates a problem with the Fuel Pump Driver Control Module Ignition On/Start Switch Circuit Low Voltage. Common causes include Damaged wiring or connectors in the ignition on/start switch circuit, Faulty fuel pump driver control module, Weak battery or alternator. 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 Damaged wiring or connectors in the ignition on/start switch circuit, Faulty fuel pump driver control module, Weak battery or alternator.
- 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.
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Code P129D 2016 GMC Sierra Description
The diagnostic trouble code P129D for a 2016 GMC Sierra indicates a problem with the Fuel Pump Driver Control Module Ignition On/Start Switch Circuit Low Voltage. This code specifically points to an issue with the control module responsible for managing the fuel pump's operation during ignition and start-up. The fuel pump driver control module plays a crucial role in regulating the fuel pump's performance, ensuring the proper fuel delivery to the engine for combustion.
Common Causes of P129D 2016 GMC Sierra
- Damaged wiring or connectors in the ignition on/start switch circuit
- Faulty fuel pump driver control module
- Weak battery or alternator
- Electrical system issues
- Corrosion or poor connections in the circuit
Symptoms of P129D 2016 GMC Sierra
- Engine misfires or runs rough
- Difficulty starting the vehicle
- Reduced fuel efficiency
- Illumination of the check engine light
- Stalling or hesitation while driving
How to Fix P129D 2016 GMC Sierra
- Begin by conducting a thorough inspection of the wiring and connectors in the ignition on/start switch circuit to check for any damage or corrosion.
- Test the fuel pump driver control module to determine if it is functioning correctly or needs replacement.
- Check the battery and alternator to ensure they are providing sufficient voltage to the fuel pump driver control module.
- Address any electrical system issues that may be affecting the circuit, such as blown fuses or relays.
- Clear the trouble code from the vehicle's computer system after completing the repairs and test the vehicle to ensure the issue has been resolved.
Cost to Fix P129D 2016 GMC Sierra
The typical repair costs for addressing a P129D code on a 2016 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of parts such as a new fuel pump driver control module and any necessary wiring or connectors can range from $200 to $500. Labor costs at auto repair shops typically fall between $80 and $150 per hour, with the total repair time varying based on the complexity of the diagnosis and repair process. It's advisable to consult with a trusted mechanic or dealership to obtain a more accurate estimate based on your vehicle's specific needs and location.
Tech Notes for P129D 2016 GMC Sierra
2016-2018 Chevrolet Silverado 1500
2019 Chevrolet Silverado LD
Dead Battery / P1682 P129D P10E4 P2535 / Crank No Start
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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.
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