P129D GMC 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 GMC 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 GMC Description
What are the Possible Causes of the DTC P129D GMC?
- 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 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
2016-2018 GMC Sierra 1500
2019 GMC Sierra Limited
Dead Battery / P1682 P129D P10E4 P2535 / Crank No Start
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P129D 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.
Need more information about the P129D GMC code?
Need more information on how to fix the P129D GMC code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P129D GMC code diagnosed by a professional: Find a repair shop in your area
Information for Specific GMC Models
- P129D 2014 GMC Sierra — Fuel Pump Driver Control Module Ignition On/Start Switch Circuit Low Voltage
- P129D 2015 GMC Sierra — Fuel Pump Driver Control Module Ignition On/Start Switch Circuit Low Voltage
- P129D 2016 GMC Sierra — Fuel Pump Driver Control Module Ignition On/Start Switch Circuit Low Voltage
- P129D 2017 GMC Sierra — Fuel Pump Driver Control Module Ignition On/Start Switch Circuit Low Voltage
- P129D 2018 GMC Sierra — Fuel Pump Driver Control Module Ignition On/Start Switch Circuit Low Voltage
Frequently Asked Questions about P129D GMC Code
1. What are common symptoms of OBDII code P129D GMC?
- Common symptoms include engine stalling, rough idle, difficulty starting the vehicle, and a malfunction indicator light (MIL) illuminated on the dashboard.
2. What causes the OBDII code P129D GMC to trigger?
- The code is typically triggered by a low voltage condition in the fuel pump driver control module ignition on/start switch circuit.
3. How can I diagnose the issue related to code P129D GMC?
- To diagnose the issue, it is recommended to perform a thorough inspection of the fuel pump driver control module, check the wiring harness for any damage, and test the voltage levels in the circuit.
4. Can a faulty fuel pump cause code P129D GMC to appear?
- Yes, a faulty fuel pump or issues with the fuel pump driver control module can lead to the triggering of code P129D GMC.
5. What are some repair tips for addressing OBDII code P129D GMC?
- Repair tips include checking and repairing any damaged wiring, replacing the fuel pump driver control module if necessary, and ensuring proper voltage levels in the circuit.
6. Is it safe to continue driving with OBDII code P129D GMC present?
- It is not recommended to continue driving with the code present, as it can lead to potential engine performance issues and possible stalling.
7. Can a DIY enthusiast fix code P129D GMC at home?
- Depending on their skill level, a DIY enthusiast may be able to address the issue by following repair guides and using appropriate tools to diagnose and fix the problem.
8. Will resetting the fault codes make code P129D GMC disappear permanently?
- Simply resetting the fault codes may clear the MIL temporarily, but if the underlying issue causing code P129D GMC is not addressed, the code is likely to reappear.
9. What are the implications of ignoring OBDII code P129D GMC?
- Ignoring the code can lead to potential fuel pump driver control module failure, which may result in more severe engine performance issues and safety concerns.
10. How much does it typically cost to repair OBDII code P129D GMC at a professional mechanic?
- The cost of repairing code P129D GMC can vary depending on the extent of the issue, but it may range from $200 to $500 or more, including parts and labor.
Discuss the causes and fixes for P129D GMC OBDII Code
Code P129D GMC comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
