AutoCodes – Generic – P129E

P129E Code - Fuel Pump Driver Control Module Signal Message Counter Incorrect

Quick Answer

The Fuel Pump Power Control Module is constantly sending serial data messages to the Engine Control Module (ECM) regarding the operating state of the fuel pump power control system. 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: P129E indicates Fuel Pump Driver Control Module Signal Message Counter Incorrect.
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.

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Code Popularity 6,645

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 Sep 27, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P129E Description

The Fuel Pump Power Control Module is constantly sending serial data messages to the Engine Control Module (ECM) regarding the operating state of the fuel pump power control system. These messages are sent in a continuously repeating series of rolling counts with associated password protect samples and each count/sample is assigned a value. When the ECM determines that too many of the counts/samples contain an error value, the ECM sets the Diagnostic Trouble Code (DTC) P129E.

OBDII Code P129E - Fuel Pump Driver Control Module Signal Message Counter Incorrect - AutoCodes.com — P129E Code - Fuel Pump Driver Control Module Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P129E?

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 P129E?

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 P129E 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 P129E code?

Need more information on how to fix the P129E code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P129E code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P129E Buick — Fuel Pump Driver Control Module Signal Message Counter Incorrect
P129E Cadillac — Fuel Pump Driver Control Module Signal Message Counter Incorrect
P129E Chevrolet — Fuel Pump Driver Control Module Signal Message Counter Incorrect
P129E GMC — Fuel Pump Driver Control Module Signal Message Counter Incorrect

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 P129E Code

1. What are the common symptoms of OBDII code P129E?

- Common symptoms include engine stalling, rough idling, poor acceleration, and difficulty starting the vehicle.

2. What can cause the OBDII code P129E to trigger?

- The code P129E can be triggered by issues with the fuel pump driver control module, such as a faulty module or wiring issues.

3. How does a faulty fuel pump driver control module affect the vehicle?

- A faulty fuel pump driver control module can cause the fuel pump to malfunction, leading to fuel delivery issues and poor engine performance.

4. Can a bad fuel pump driver control module be repaired, or does it need to be replaced?

- In most cases, a bad fuel pump driver control module will need to be replaced to resolve the issue.

5. Are there any DIY repair tips for fixing the OBDII code P129E?

- DIY repair tips include checking the wiring connections to the fuel pump driver control module and ensuring they are secure and free of corrosion.

6. What diagnostic steps can be taken to troubleshoot the OBDII code P129E?

- Diagnostic steps may include using a scan tool to retrieve the code, checking the fuel pump driver control module for proper function, and inspecting related wiring.

7. Is it safe to continue driving with the OBDII code P129E present?

- It is not recommended to continue driving with the OBDII code P129E present, as it can lead to further damage and potentially leave you stranded.

8. How much does it typically cost to repair the OBDII code P129E?

- The cost of repairing the OBDII code P129E can vary depending on the labor rates and parts needed, but it is generally an affordable repair compared to other issues.

9. Can a mechanic clear the OBDII code P129E after the repair is completed?

- Yes, a mechanic can clear the OBDII code P129E using a scan tool after the repair is completed to reset the vehicle's system.

10. How can I prevent the OBDII code P129E from recurring in the future?

- To prevent the OBDII code P129E from recurring, it's essential to perform regular maintenance on the fuel pump driver control module and address any related issues promptly.