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P129D Chevrolet Code - Fuel Pump Driver Control Module Ignition On/Start Switch Circuit Low Voltage

Quick Answer

The P129D Chevrolet diagnostic trouble code (DTC) indicates a problem with the Fuel Pump Driver Control Module Ignition On/Start Switch Circuit, specifically detecting low voltage. Common causes include Damaged wiring or connectors in the ignition on/start switch circuit, Faulty fuel pump driver control module, Weak or dead battery. 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 Chevrolet 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 or dead battery.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code P129D Chevrolet Description

The P129D Chevrolet diagnostic trouble code (DTC) indicates a problem with the Fuel Pump Driver Control Module Ignition On/Start Switch Circuit, specifically detecting low voltage. This code is typically found in Chevrolet vehicles, signaling a potential issue with the fuel pump driver control module, which is responsible for regulating the fuel pump's operation. The fuel pump driver control module plays a crucial role in managing the fuel pump's speed and ensuring the correct fuel pressure is maintained for optimal engine performance.

OBDII Code P129D Chevrolet - Fuel Pump Driver Control Module Ignition On/Start Switch Circuit Low Voltage
P129D Chevrolet Code - Fuel Pump Driver Control Module Ignition On/Start Switch Circuit Low Voltage

Common Causes of P129D Chevrolet

  1. Damaged wiring or connectors in the ignition on/start switch circuit
  2. Faulty fuel pump driver control module
  3. Weak or dead battery
  4. Blown fuse related to the fuel pump circuit
  5. Problem with the engine control module (ECM)

Symptoms of P129D Chevrolet

  1. Engine misfires or hesitation during acceleration
  2. Rough idling or stalling
  3. Difficulty starting or failure to start
  4. Decreased engine performance
  5. Check engine light illuminated on the dashboard

How to Fix P129D Chevrolet

  1. Begin by connecting a diagnostic scanner to the vehicle's onboard computer to retrieve the specific fault codes and confirm the presence of the P129D code.
  2. Inspect the wiring and connectors in the ignition on/start switch circuit for any signs of damage or corrosion. Repair or replace any faulty components as needed.
  3. Test the fuel pump driver control module using a multimeter to check for proper voltage output. Replace the module if it fails to function correctly.
  4. Check the battery's voltage and ensure it is in good condition. Replace the battery if it is weak or dead.
  5. Verify the integrity of the fuses related to the fuel pump circuit and replace any blown fuses.

Cost to Fix P129D Chevrolet

The typical repair costs for addressing the P129D Chevrolet code can vary depending on the extent of the issue and the specific components that require replacement. In general, the parts needed for this repair, such as a new fuel pump driver control module or battery, can range from $100 to $500. Labor costs at auto repair shops typically range between $80 and $150 per hour, with the total repair bill potentially amounting to several hundred dollars.

What does this mean?

Tech Notes for P129D Chevrolet

There is a Factory Service Bulletin for the following Chevrolet models:
2016-2018 Chevrolet Silverado 1500
2019 Chevrolet Silverado LD
Dead Battery / P1682 P129D P10E4 P2535 / Crank No Start





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Information for Specific Chevrolet Models

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P129D Chevrolet Code

1. What are common symptoms of OBDII code P129D in a Chevrolet related to the Fuel Pump Driver Control Module Ignition On/Start Switch Circuit Low Voltage?

- Common symptoms include difficulty starting the vehicle, engine stalling, and issues with fuel delivery.

2. What are possible causes of the P129D code in a Chevrolet related to the Fuel Pump Driver Control Module Ignition On/Start Switch Circuit Low Voltage?

- Possible causes include a faulty fuel pump driver control module, issues with the ignition switch, wiring problems, or a low voltage condition.

3. How can I diagnose the P129D code in a Chevrolet related to the Fuel Pump Driver Control Module Ignition On/Start Switch Circuit Low Voltage?

- Diagnosis typically involves checking the fuel pump driver control module for proper function, inspecting the ignition switch, and testing the voltage in the circuit.

4. Can I drive my Chevrolet with the P129D code related to the Fuel Pump Driver Control Module Ignition On/Start Switch Circuit Low Voltage?

- It is not recommended to drive the vehicle with this code as it can lead to potential issues with fuel delivery and engine performance.

5. How can I repair the P129D code in a Chevrolet related to the Fuel Pump Driver Control Module Ignition On/Start Switch Circuit Low Voltage?

- Repair may involve replacing the fuel pump driver control module, addressing any wiring issues, or fixing problems with the ignition switch.

6. Is it safe to continue driving my Chevrolet if the P129D code related to the Fuel Pump Driver Control Module Ignition On/Start Switch Circuit Low Voltage keeps coming back after repairs?

- It is best to address the issue promptly to prevent potential damage to the fuel system or other components of the vehicle.

7. Are there any DIY tips for fixing the P129D code in a Chevrolet related to the Fuel Pump Driver Control Module Ignition On/Start Switch Circuit Low Voltage?

- DIY tips may include checking and cleaning the electrical connections, inspecting the wiring for damage, and ensuring proper voltage supply to the fuel pump driver control module.

8. How much does it typically cost to repair the P129D code in a Chevrolet related to the Fuel Pump Driver Control Module Ignition On/Start Switch Circuit Low Voltage?

- Repair costs can vary depending on the specific cause of the issue, but it may involve replacing the fuel pump driver control module or addressing wiring problems.

9. Will resetting the OBDII code P129D related to the Fuel Pump Driver Control Module Ignition On/Start Switch Circuit Low Voltage make it go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue is not fixed, the code is likely to return.

10. Can a mechanic easily fix the P129D code related to the Fuel Pump Driver Control Module Ignition On/Start Switch Circuit Low Voltage in a Chevrolet?

- A mechanic with experience in diagnosing and repairing electrical issues should be able to effectively address the P129D code in a Chevrolet.

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