AutoCodes – Chevrolet – P129B Chevrolet

P129B Chevrolet Code - Fuel Pump Driver Control Module System Voltage Low

Quick Answer

The Fuel Pump Power Control Module monitors the battery positive voltage circuit to verify the voltage is within the normal operating range. Common causes include Faulty Fuel Pump Driver Control Module, Fuel Pump Driver Control Module harness is open or shorted, Fuel Pump Driver 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: P129B Chevrolet indicates Fuel Pump Driver Control Module System Voltage Low.
Common causes: Common causes include Faulty Fuel Pump Driver Control Module, Fuel Pump Driver Control Module harness is open or shorted, Fuel Pump Driver 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.

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Code Popularity 10,245

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 04, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P129B Chevrolet Description

The Fuel Pump Power Control Module monitors the battery positive voltage circuit to verify the voltage is within the normal operating range. The Diagnostic Trouble Code (DTC) will be set when the Fuel Pump Power Control Module detects the battery positive voltage is less than 7 V for 1 s.

OBDII Code P129B Chevrolet - Fuel Pump Driver Control Module System Voltage Low - AutoCodes.com — P129B Chevrolet Code - Fuel Pump Driver Control Module System Voltage Low

What does this mean?

What are the Possible Causes of the DTC P129B Chevrolet?

Faulty Fuel Pump Driver Control Module
Fuel Pump Driver Control Module harness is open or shorted
Fuel Pump Driver Control Module circuit poor electrical connection

How to Fix the DTC P129B Chevrolet?

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 P129B Chevrolet 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 P129B Chevrolet code?

Need more information on how to fix the P129B Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P129B Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

P129B 2014 Chevrolet Silverado — Fuel Pump Driver Control Module System Voltage Low
P129B 2015 Chevrolet Silverado — Fuel Pump Driver Control Module System Voltage Low
P129B 2016 Chevrolet Silverado — Fuel Pump Driver Control Module System Voltage Low
P129B 2017 Chevrolet Silverado — Fuel Pump Driver Control Module System Voltage Low
P129B 2018 Chevrolet Silverado — Fuel Pump Driver Control Module System Voltage Low

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 P129B Chevrolet Code

1. What are the common symptoms of OBDII code P129B in a Chevrolet related to the Fuel Pump Driver Control Module System Voltage Low?

The common symptoms include rough idling, engine stalling, difficulty starting the vehicle, and a noticeable decrease in fuel efficiency.

2. What are the possible causes of the OBDII code P129B indicating a low voltage in the Fuel Pump Driver Control Module system of a Chevrolet?

Possible causes could include a faulty fuel pump driver control module, damaged wiring or connectors, a failing fuel pump, or issues with the vehicle's power supply.

3. How can I diagnose the root cause of the OBDII code P129B in my Chevrolet related to the Fuel Pump Driver Control Module System Voltage Low?

To diagnose the issue, you may need to perform a thorough inspection of the fuel pump driver control module, check the wiring and connectors for any damage, test the fuel pump's functionality, and ensure the vehicle's power supply is stable.

4. Can a DIY enthusiast repair the OBDII code P129B Fuel Pump Driver Control Module System Voltage Low issue in a Chevrolet?

While some aspects of the repair process may be DIY-friendly, diagnosing and fixing electrical problems like this code may require specialized tools and expertise. It's recommended to consult a professional mechanic for accurate diagnosis and repair.

5. Are there any quick tips to troubleshoot the OBDII code P129B in a Chevrolet indicating low voltage in the Fuel Pump Driver Control Module system?

You can start by checking the vehicle's battery voltage, inspecting the fuel pump driver control module for visible damage, and ensuring all wiring and connectors related to the fuel pump system are secure and free of corrosion.

6. How critical is it to address the OBDII code P129B Fuel Pump Driver Control Module System Voltage Low in a Chevrolet promptly?

Ignoring this issue can lead to more severe problems such as complete fuel pump failure, engine misfires, or even the vehicle failing to start. It's crucial to address this code promptly to prevent further damage.

7. Can extreme weather conditions affect the occurrence of the OBDII code P129B in a Chevrolet related to the Fuel Pump Driver Control Module System Voltage Low?

Extreme temperatures or weather conditions can potentially exacerbate issues related to the fuel pump driver control module system, leading to voltage fluctuations and triggering the P129B trouble code.

8. Is it safe to continue driving my Chevrolet with the OBDII code P129B Fuel Pump Driver Control Module System Voltage Low illuminated?

Continuing to drive with this code present can be risky, as it may cause unexpected engine stalling or other drivability issues. It's best to address the underlying problem as soon as possible to ensure safe operation of the vehicle.

9. How much can I expect to spend on repairing the OBDII code P129B Fuel Pump Driver Control Module System Voltage Low in a Chevrolet?

The cost of repair can vary depending on the root cause of the issue, parts needed for replacement, and labor charges. It's advisable to obtain estimates from reputable mechanics or service centers for an accurate cost assessment.

10. Can a software update or reset resolve the OBDII code P129B issue related to the Fuel Pump Driver Control Module System Voltage Low in a Chevrolet?

In some cases, performing a software update or reset may temporarily clear the code, but if the underlying problem persists, the code is likely to reappear. It's best to address the actual cause of the issue for a lasting solution.